Upload folder using huggingface_hub

.gitattributes

@@ -1,35 +1,12 @@
-*.7z filter=lfs diff=lfs merge=lfs -text
-*.arrow filter=lfs diff=lfs merge=lfs -text
-*.bin filter=lfs diff=lfs merge=lfs -text
-*.bz2 filter=lfs diff=lfs merge=lfs -text
-*.ckpt filter=lfs diff=lfs merge=lfs -text
-*.ftz filter=lfs diff=lfs merge=lfs -text
-*.gz filter=lfs diff=lfs merge=lfs -text
-*.h5 filter=lfs diff=lfs merge=lfs -text
-*.joblib filter=lfs diff=lfs merge=lfs -text
-*.lfs.* filter=lfs diff=lfs merge=lfs -text
-*.mlmodel filter=lfs diff=lfs merge=lfs -text
-*.model filter=lfs diff=lfs merge=lfs -text
-*.msgpack filter=lfs diff=lfs merge=lfs -text
-*.npy filter=lfs diff=lfs merge=lfs -text
-*.npz filter=lfs diff=lfs merge=lfs -text
-*.onnx filter=lfs diff=lfs merge=lfs -text
-*.ot filter=lfs diff=lfs merge=lfs -text
-*.parquet filter=lfs diff=lfs merge=lfs -text
-*.pb filter=lfs diff=lfs merge=lfs -text
-*.pickle filter=lfs diff=lfs merge=lfs -text
-*.pkl filter=lfs diff=lfs merge=lfs -text
-*.pt filter=lfs diff=lfs merge=lfs -text
-*.pth filter=lfs diff=lfs merge=lfs -text
-*.rar filter=lfs diff=lfs merge=lfs -text
-*.safetensors filter=lfs diff=lfs merge=lfs -text
-saved_model/**/* filter=lfs diff=lfs merge=lfs -text
-*.tar.* filter=lfs diff=lfs merge=lfs -text
-*.tar filter=lfs diff=lfs merge=lfs -text
-*.tflite filter=lfs diff=lfs merge=lfs -text
-*.tgz filter=lfs diff=lfs merge=lfs -text
-*.wasm filter=lfs diff=lfs merge=lfs -text
-*.xz filter=lfs diff=lfs merge=lfs -text
-*.zip filter=lfs diff=lfs merge=lfs -text
-*.zst filter=lfs diff=lfs merge=lfs -text
-*tfevents* filter=lfs diff=lfs merge=lfs -text
+# Auto detect text files and perform LF normalization
+* text=auto
+assets/840_iSXIa0hE8Ek.zip filter=lfs diff=lfs merge=lfs -text
+assets/cars.mp4 filter=lfs diff=lfs merge=lfs -text
+assets/cell.mp4 filter=lfs diff=lfs merge=lfs -text
+assets/demo_3x2.gif filter=lfs diff=lfs merge=lfs -text
+assets/top.gif filter=lfs diff=lfs merge=lfs -text
+sam/assets/masks1.png filter=lfs diff=lfs merge=lfs -text
+sam/assets/notebook2.png filter=lfs diff=lfs merge=lfs -text
+tutorial/img/click_segment.jpg filter=lfs diff=lfs merge=lfs -text
+tutorial/img/input_video.jpg filter=lfs diff=lfs merge=lfs -text
+tutorial/img/start_tracking.jpg filter=lfs diff=lfs merge=lfs -text

.gitignore

@@ -0,0 +1,14 @@
+.vscode
+ckpt/*
+assets/*masks
+assets/*mp4
+# assets/*zip
+assets/*gif
+*.pyc
+debug
+cym_utils
+/src
+/tracking_results
+/aot/results
+/aot/pretrain_models
+/aot/datasets

LICENSE.txt

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
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README.md

@@ -1,12 +1,211 @@
----
-title: SAM Track
-emoji: 🌖
-colorFrom: pink
-colorTo: blue
-sdk: gradio
-sdk_version: 4.8.0
-app_file: app.py
-pinned: false
----
-
-Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+# Segment and Track Anything (SAM-Track)
+**Online Demo:** [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/drive/1R10N70AJaslzADFqb-a5OihYkllWEVxB?usp=sharing)
+**Technical Report**: [![](https://img.shields.io/badge/Report-arXiv:2305.06558-green)](https://arxiv.org/abs/2305.06558)
+
+**Tutorial:** [tutorial-v1.5 (Text)](./tutorial/tutorial%20for%20WebUI-1.5-Version.md), [tutorial-v1.0 (Click & Brush)](./tutorial/tutorial%20for%20WebUI-1.0-Version.md)
+
+<p align="center">
+<img src="./assets/top.gif" width="880">
+</p>
+
+**Segment and Track Anything** is an open-source project that focuses on the segmentation and tracking of any objects in videos, utilizing both automatic and interactive methods. The primary algorithms utilized include the [**SAM** (Segment Anything Models)](https://github.com/facebookresearch/segment-anything) for automatic/interactive key-frame segmentation and the [**DeAOT** (Decoupling features in Associating Objects with Transformers)](https://github.com/yoxu515/aot-benchmark) (NeurIPS2022) for efficient multi-object tracking and propagation. The SAM-Track pipeline enables dynamic and automatic detection and segmentation of new objects by SAM, while DeAOT is responsible for tracking all identified objects.
+
+## :loudspeaker:New Features
+- [2023/5/12] We have authored a technical report for SAM-Track.
+- [2023/5/7] We have added `demo_instseg.ipynb`, which uses Grounding-DINO to detect new objects in the key frames of a video. It can be applied in the fields of smart cities and autonomous driving.
+- [2023/4/29] We have added advanced arguments for AOT-L: `long_term_memory_gap` and `max_len_long_term`.
+   - `long_term_memory_gap` controls the frequency at which the AOT model adds new reference frames to its long-term memory. During mask propagation, AOT matches the current frame with the reference frames stored in the long-term memory. 
+   - Setting the gap value to a proper value helps to obtain better performance. To avoid memory explosion in long videos, we set a `max_len_long_term` value for the long-term memory storage, i.e. when the number of memory frames reaches the `max_len_long_term value`, the oldest memory frame will be discarded and a new frame will be added.
+
+- [2023/4/26] **Interactive WebUI 1.5-Version**: We have added new features based on Interactive WebUI-1.0 Version.
+   - We have added a new form of interactivity—text prompts—to SAMTrack.
+   - From now on, multiple objects that need to be tracked can be interactively added.
+   - Check out [tutorial](./tutorial/tutorial%20for%20WebUI-1.5-Version.md) for Interactive WebUI 1.5-Version. More demos will be released in the next few days.
+- [2023/4/26] **Image-Sequence input**: The WebUI now has a new feature that allows for input of image sequences, which can be used to test video segmentation datasets. Get started with the [tutorial](./tutorial/tutorial%20for%20Image-Sequence%20input.md) for Image-Sequence input. 
+- [2023/4/25] **Online Demo:** You can easily use SAMTrack in [Colab](https://colab.research.google.com/drive/1R10N70AJaslzADFqb-a5OihYkllWEVxB?usp=sharing) for visual tracking tasks.
+
+- [2023/4/23] **Interactive WebUI:** We have introduced a new WebUI that allows interactive user segmentation through strokes and clicks. Feel free to explore and have fun with the [tutorial](./tutorial/tutorial%20for%20WebUI-1.0-Version.md)!
+    - [2023/4/24] **Tutorial V1.0:** Check out our new video tutorials!
+      - YouTube-Link: [Tutorial for Interactively modify single-object mask for first frame of video](https://www.youtube.com/watch?v=DF0iFSsX8KY)、[Tutorial for Interactively add object by click](https://www.youtube.com/watch?v=UJvKPng9_DA)、[Tutorial for Interactively add object by stroke](https://www.youtube.com/watch?v=m1oFavjIaCM).
+      - Bilibili Video Link:[Tutorial for Interactively modify single-object mask for first frame of video](https://www.bilibili.com/video/BV1tM4115791/?spm_id_from=333.999.0.0)、[Tutorial for Interactively add object by click](https://www.bilibili.com/video/BV1Qs4y1A7d1/)、[Tutorial for Interactively add object by stroke](https://www.bilibili.com/video/BV1Lm4y117J4/?spm_id_from=333.999.0.0).
+    - 1.0-Version is a developer version, please feel free to contact us if you encounter any bugs :bug:.
+
+- [2023/4/17] **SAMTrack**: Automatically segment and track anything in video!
+
+## :fire:Demos
+<div align=center>
+
+[![Segment-and-Track-Anything Versatile Demo](https://res.cloudinary.com/marcomontalbano/image/upload/v1681713095/video_to_markdown/images/youtube--UPhtpf1k6HA-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://youtu.be/UPhtpf1k6HA "Segment-and-Track-Anything Versatile Demo")
+</div>
+
+This video showcases the segmentation and tracking capabilities of SAM-Track in various scenarios, such as street views, AR, cells, animations, aerial shots, and more.
+
+## :calendar:TODO
+ - [x] Colab notebook: Completed on April 25th, 2023.
+ - [x] 1.0-Version Interactive WebUI: Completed on April 23rd, 2023.
+    - We will create a feature that enables users to interactively modify the mask for the initial video frame according to their needs. The interactive segmentation capabilities of Segment-and-Track-Anything is demonstrated in [Demo8](https://www.youtube.com/watch?v=Xyd54AngvV8&feature=youtu.be) and [Demo9](https://www.youtube.com/watch?v=eZrdna8JkoQ).
+    - Bilibili Video Link: [Demo8](https://www.bilibili.com/video/BV1JL411v7uE/), [Demo9](https://www.bilibili.com/video/BV1Qs4y1w763/).
+ - [x] 1.5-Version Interactive WebUI: Completed on April 26th, 2023.
+    - We will develop a function that allows interactive modification of multi-object masks for the first frame of a video. This function will be based on Version 1.0.  YouTube: [Demo4](https://www.youtube.com/watch?v=UFtwFaOfx2I&feature=youtu.be), [Demo5](https://www.youtube.com/watch?v=cK5MPFdJdSY&feature=youtu.be); Bilibili: [Demo4](https://www.bilibili.com/video/BV17X4y127mJ/), [Demo5](https://www.bilibili.com/video/BV1Pz4y1a7mC/)
+    - Furthermore, we plan to include text prompts as an additional form of interaction. YouTube: [Demo1](https://www.youtube.com/watch?v=5oieHqFIJPc&feature=youtu.be), [Demo2](https://www.youtube.com/watch?v=nXfq17X6ohk); Bilibili: [Demo1](https://www.bilibili.com/video/BV1hg4y157yd/?vd_source=fe3b5c0215d05cc44c8eb3d94abae3ca), [Demo2](https://www.bilibili.com/video/BV1RV4y1k7i5/)
+ - [ ] 2.x-Version Interactive WebUI
+    - In version 2.x, the segmentation model will offer two options: SAM and SEEM.
+    - We will develop a new function where the fixed-category object detection result can be displayed as a prompt.
+    - We will enable SAM-Track to add and modify objects during tracking. YouTube: [Demo6](https://www.youtube.com/watch?v=l7hXM1a3nEA&feature=youtu.be
+), [Demo7](https://www.youtube.com/watch?v=hPjw28Ul4cw&feature=youtu.be); Bilibili: [Demo6](https://www.bilibili.com/video/BV1nk4y1j7Am), [Demo7](https://www.bilibili.com/video/BV1mk4y1E78s/?vd_source=fe3b5c0215d05cc44c8eb3d94abae3ca)
+
+**Demo1** showcases SAM-Track's ability to take the class of objects as prompt. The user gives the category text 'panda' to enable instance-level segmentation and tracking of all objects belonging to this category.
+<div align=center>
+ 
+[![demo1](https://res.cloudinary.com/marcomontalbano/image/upload/v1683347297/video_to_markdown/images/youtube--5oieHqFIJPc-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://www.youtube.com/watch?v=5oieHqFIJPc&feature=youtu.be "demo1")
+</div>
+
+**Demo2** showcases SAM-Track's ability to take the text description as prompt. SAM-Track could segment and track target objects given the input that 'panda on the far left'.
+<div align=center>
+ 
+[![demo1](https://res.cloudinary.com/marcomontalbano/image/upload/v1683347643/video_to_markdown/images/youtube--nXfq17X6ohk-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://www.youtube.com/watch?v=nXfq17X6ohk "demo1")
+</div>
+
+
+**Demo3** showcases SAM-Track's ability to track numerous objects at the same time. SAM-Track is capable of automatically detecting newly appearing objects.
+<div align=center>
+ 
+[![demo1](https://res.cloudinary.com/marcomontalbano/image/upload/v1683347961/video_to_markdown/images/youtube--jMqFMq0tRP0-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://www.youtube.com/watch?v=jMqFMq0tRP0 "demo1")
+</div>
+
+**Demo4** showcases SAM-Track's ability to take multiple modes of interactions as prompt. The user specified human and skateboard with click and brushstroke, respectively.  
+<div align=center>
+ 
+[![demo1](https://res.cloudinary.com/marcomontalbano/image/upload/v1683348115/video_to_markdown/images/youtube--UFtwFaOfx2I-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://www.youtube.com/watch?v=UFtwFaOfx2I&feature=youtu.be "demo1")
+</div>
+
+
+**Demo5** showcases SAM-Track's ability to refine the results of segment-everything. The user merges the tram as a whole with a single click.
+<div align=center>
+ 
+[![demo1](https://res.cloudinary.com/marcomontalbano/image/upload/v1683348276/video_to_markdown/images/youtube--cK5MPFdJdSY-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://www.youtube.com/watch?v=cK5MPFdJdSY&feature=youtu.be "demo1")
+</div>
+
+**Demo6** showcases SAM-Track's ability to add new objects during tracking. The user annotates another car by rolling back to an intermediate frame.
+<div align=center>
+ 
+[![demo1](https://res.cloudinary.com/marcomontalbano/image/upload/v1683348411/video_to_markdown/images/youtube--l7hXM1a3nEA-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://www.youtube.com/watch?v=l7hXM1a3nEA "demo1")
+</div>
+
+**Demo7** showcases SAM-Track's ability to refine the prediction during tracking. This feature is highly advantageous for segmentation and tracking under complex environments.
+<div align=center>
+
+[![demo1](https://res.cloudinary.com/marcomontalbano/image/upload/v1683348621/video_to_markdown/images/youtube--hPjw28Ul4cw-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://www.youtube.com/watch?v=hPjw28Ul4cw&feature=youtu.be "demo1")
+</div>
+
+**Demo8** showcases SAM-Track's ability to interactively segment and track individual objects.  The user specified that SAM-Track tracked a man playing street basketball.
+<div align=center>
+
+[![Interactive Segment-and-Track-Anything Demo1](https://res.cloudinary.com/marcomontalbano/image/upload/v1681712022/video_to_markdown/images/youtube--Xyd54AngvV8-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://www.youtube.com/watch?v=Xyd54AngvV8 "Interactive Segment-and-Track-Anything Demo1")
+</div>
+
+**Demo9** showcases SAM-Track's ability to interactively add specified objects for tracking.The user customized the addition of objects to be tracked on top of the segmentation of everything in the scene using SAM-Track.
+<div align=center>
+ 
+[![Interactive Segment-and-Track-Anything Demo2](https://res.cloudinary.com/marcomontalbano/image/upload/v1681712071/video_to_markdown/images/youtube--eZrdna8JkoQ-c05b58ac6eb4c4700831b2b3070cd403.jpg)](https://www.youtube.com/watch?v=eZrdna8JkoQ "Interactive Segment-and-Track-Anything Demo2")
+</div>
+
+## :computer:Getting Started
+### :bookmark_tabs:Requirements
+
+The [Segment-Anything](https://github.com/facebookresearch/segment-anything) repository has been cloned and renamed as sam, and the [aot-benchmark](https://github.com/yoxu515/aot-benchmark) repository has been cloned and renamed as aot.
+
+Please check the dependency requirements in [SAM](https://github.com/facebookresearch/segment-anything) and [DeAOT](https://github.com/yoxu515/aot-benchmark).
+
+The implementation is tested under python 3.9, as well as pytorch 1.10 and torchvision 0.11. **We recommend equivalent or higher pytorch version**.
+
+Use the `install.sh` to install the necessary libs for SAM-Track
+```
+bash script/install.sh
+```
+
+### :star:Model Preparation
+Download SAM model to ckpt, the default model is SAM-VIT-B ([sam_vit_b_01ec64.pth](https://dl.fbaipublicfiles.com/segment_anything/sam_vit_b_01ec64.pth)).
+
+Download DeAOT/AOT model to ckpt, the default model is R50-DeAOT-L ([R50_DeAOTL_PRE_YTB_DAV.pth](https://drive.google.com/file/d/1QoChMkTVxdYZ_eBlZhK2acq9KMQZccPJ/view)).
+
+Download Grounding-Dino model to ckpt, the default model is GroundingDINO-T ([groundingdino_swint_ogc](https://huggingface.co/ShilongLiu/GroundingDINO/resolve/main/groundingdino_swint_ogc.pth)).
+
+You can download the default weights using the command line as shown below.
+```
+bash script/download_ckpt.sh
+```
+
+### :heart:Run Demo
+- The video to be processed can be put in ./assets. 
+- Then run **demo.ipynb** step by step to generate results. 
+- The results will be saved as masks for each frame and a gif file for visualization.
+
+The arguments for SAM-Track, DeAOT and SAM can be manually modified in model_args.py for purpose of using other models or controling the behavior of each model.
+
+### :muscle:WebUI App
+Our user-friendly visual interface allows you to easily obtain the results of your experiments. Simply initiate it using the command line.
+
+```
+python app.py
+```
+Users can upload the video directly on the UI and use SegTracker to automatically/interactively track objects within that video. We use a video of a man playing basketball as an example.
+
+![Interactive WebUI](./assets/interactive_webui.jpg)
+
+SegTracker-Parameters:
+ - **aot_model**: used to select which version of DeAOT/AOT to use for tracking and propagation.
+ - **sam_gap**: used to control how often SAM is used to add newly appearing objects at specified frame intervals. Increase to decrease the frequency of discovering new targets, but significantly improve speed of inference.
+ - **points_per_side**: used to control the number of points per side used for generating masks by sampling a grid over the image. Increasing the size enhances the ability to detect small objects, but larger targets may be segmented into finer granularity.
+ - **max_obj_num**: used to limit the maximum number of objects that SAM-Track can detect and track. A larger number of objects necessitates a greater utilization of memory, with approximately 16GB of memory capable of processing a maximum of 255 objects.
+
+Usage: To see the details, please refer to the [tutorial for 1.0-Version WebUI](./tutorial/tutorial%20for%20WebUI-1.0-Version.md).
+
+### :school:About us
+Thank you for your interest in this project. The project is supervised by the ReLER Lab at Zhejiang University’s College of Computer Science and Technology. ReLER was established by Yang Yi, a Qiu Shi Distinguished Professor at Zhejiang University. Our dedicated team of contributors includes [Yangming Cheng](https://github.com/yamy-cheng), [Yuanyou Xu](https://github.com/yoxu515), [Liulei Li](https://github.com/lingorX), [Xiaodi Li](https://github.com/LiNO3Dy), [Zongxin Yang](https://z-x-yang.github.io/), [Wenguan Wang](https://sites.google.com/view/wenguanwang) and [Yi Yang](https://scholar.google.com/citations?user=RMSuNFwAAAAJ&hl=en).
+
+### :full_moon_with_face:Credits
+Licenses for borrowed code can be found in [licenses.md](https://github.com/z-x-yang/Segment-and-Track-Anything/blob/main/licenses.md) file. 
+
+* DeAOT/AOT - [https://github.com/yoxu515/aot-benchmark](https://github.com/yoxu515/aot-benchmark)
+* SAM - [https://github.com/facebookresearch/segment-anything](https://github.com/facebookresearch/segment-anything)
+* Gradio (for building WebUI) - [https://github.com/gradio-app/gradio](https://github.com/gradio-app/gradio)
+* Grounding-Dino - [https://github.com/yamy-cheng/GroundingDINO](https://github.com/yamy-cheng/GroundingDINO)
+
+### License
+The project is licensed under the [AGPL-3.0 license](https://github.com/z-x-yang/Segment-and-Track-Anything/blob/main/LICENSE.txt). To utilize or further develop this project for commercial purposes through proprietary means, permission must be granted by us (as well as the owners of any borrowed code).
+
+### Citations
+Please consider citing the related paper(s) in your publications if it helps your research.
+```
+@article{cheng2023segment,
+  title={Segment and Track Anything},
+  author={Cheng, Yangming and Li, Liulei and Xu, Yuanyou and Li, Xiaodi and Yang, Zongxin and Wang, Wenguan and Yang, Yi},
+  journal={arXiv preprint arXiv:2305.06558},
+  year={2023}
+}
+@article{kirillov2023segment,
+  title={Segment anything},
+  author={Kirillov, Alexander and Mintun, Eric and Ravi, Nikhila and Mao, Hanzi and Rolland, Chloe and Gustafson, Laura and Xiao, Tete and Whitehead, Spencer and Berg, Alexander C and Lo, Wan-Yen and others},
+  journal={arXiv preprint arXiv:2304.02643},
+  year={2023}
+}
+@inproceedings{yang2022deaot,
+  title={Decoupling Features in Hierarchical Propagation for Video Object Segmentation},
+  author={Yang, Zongxin and Yang, Yi},
+  booktitle={Advances in Neural Information Processing Systems (NeurIPS)},
+  year={2022}
+}
+@inproceedings{yang2021aot,
+  title={Associating Objects with Transformers for Video Object Segmentation},
+  author={Yang, Zongxin and Wei, Yunchao and Yang, Yi},
+  booktitle={Advances in Neural Information Processing Systems (NeurIPS)},
+  year={2021}
+}
+@article{liu2023grounding,
+  title={Grounding dino: Marrying dino with grounded pre-training for open-set object detection},
+  author={Liu, Shilong and Zeng, Zhaoyang and Ren, Tianhe and Li, Feng and Zhang, Hao and Yang, Jie and Li, Chunyuan and Yang, Jianwei and Su, Hang and Zhu, Jun and others},
+  journal={arXiv preprint arXiv:2303.05499},
+  year={2023}
+}
+```

SegTracker.py

@@ -0,0 +1,264 @@
+import sys
+sys.path.append("..")
+sys.path.append("./sam")
+from sam.segment_anything import sam_model_registry, SamAutomaticMaskGenerator
+from aot_tracker import get_aot
+import numpy as np
+from tool.segmentor import Segmentor
+from tool.detector import Detector
+from tool.transfer_tools import draw_outline, draw_points
+import cv2
+from seg_track_anything import draw_mask
+
+
+class SegTracker():
+    def __init__(self,segtracker_args, sam_args, aot_args) -> None:
+        """
+         Initialize SAM and AOT.
+        """
+        self.sam = Segmentor(sam_args)
+        self.tracker = get_aot(aot_args)
+        self.detector = Detector(self.sam.device)
+        self.sam_gap = segtracker_args['sam_gap']
+        self.min_area = segtracker_args['min_area']
+        self.max_obj_num = segtracker_args['max_obj_num']
+        self.min_new_obj_iou = segtracker_args['min_new_obj_iou']
+        self.reference_objs_list = []
+        self.object_idx = 1
+        self.curr_idx = 1
+        self.origin_merged_mask = None  # init by segment-everything or update
+        self.first_frame_mask = None
+
+        # debug
+        self.everything_points = []
+        self.everything_labels = []
+        print("SegTracker has been initialized")
+
+    def seg(self,frame):
+        '''
+        Arguments:
+            frame: numpy array (h,w,3)
+        Return:
+            origin_merged_mask: numpy array (h,w)
+        '''
+        frame = frame[:, :, ::-1]
+        anns = self.sam.everything_generator.generate(frame)
+
+        # anns is a list recording all predictions in an image
+        if len(anns) == 0:
+            return
+        # merge all predictions into one mask (h,w)
+        # note that the merged mask may lost some objects due to the overlapping
+        self.origin_merged_mask = np.zeros(anns[0]['segmentation'].shape,dtype=np.uint8)
+        idx = 1
+        for ann in anns:
+            if ann['area'] > self.min_area:
+                m = ann['segmentation']
+                self.origin_merged_mask[m==1] = idx
+                idx += 1
+                self.everything_points.append(ann["point_coords"][0])
+                self.everything_labels.append(1)
+
+        obj_ids = np.unique(self.origin_merged_mask)
+        obj_ids = obj_ids[obj_ids!=0]
+
+        self.object_idx = 1
+        for id in obj_ids:
+            if np.sum(self.origin_merged_mask==id) < self.min_area or self.object_idx > self.max_obj_num:
+                self.origin_merged_mask[self.origin_merged_mask==id] = 0
+            else:
+                self.origin_merged_mask[self.origin_merged_mask==id] = self.object_idx
+                self.object_idx += 1
+
+        self.first_frame_mask = self.origin_merged_mask
+        return self.origin_merged_mask
+
+    def update_origin_merged_mask(self, updated_merged_mask):
+        self.origin_merged_mask = updated_merged_mask
+        # obj_ids = np.unique(updated_merged_mask)
+        # obj_ids = obj_ids[obj_ids!=0]
+        # self.object_idx = int(max(obj_ids)) + 1
+
+    def reset_origin_merged_mask(self, mask, id):
+        self.origin_merged_mask = mask
+        self.curr_idx = id
+
+    def add_reference(self,frame,mask,frame_step=0):
+        '''
+        Add objects in a mask for tracking.
+        Arguments:
+            frame: numpy array (h,w,3)
+            mask: numpy array (h,w)
+        '''
+        self.reference_objs_list.append(np.unique(mask))
+        self.curr_idx = self.get_obj_num()
+        self.tracker.add_reference_frame(frame,mask, self.curr_idx, frame_step)
+
+    def track(self,frame,update_memory=False):
+        '''
+        Track all known objects.
+        Arguments:
+            frame: numpy array (h,w,3)
+        Return:
+            origin_merged_mask: numpy array (h,w)
+        '''
+        pred_mask = self.tracker.track(frame)
+        if update_memory:
+            self.tracker.update_memory(pred_mask)
+        return pred_mask.squeeze(0).squeeze(0).detach().cpu().numpy().astype(np.uint8)
+    
+    def get_tracking_objs(self):
+        objs = set()
+        for ref in self.reference_objs_list:
+            objs.update(set(ref))
+        objs = list(sorted(list(objs)))
+        objs = [i for i in objs if i!=0]
+        return objs
+    
+    def get_obj_num(self):
+        objs = self.get_tracking_objs()
+        if len(objs) == 0: return 0
+        return int(max(objs))
+
+    def find_new_objs(self, track_mask, seg_mask):
+        '''
+        Compare tracked results from AOT with segmented results from SAM. Select objects from background if they are not tracked.
+        Arguments:
+            track_mask: numpy array (h,w)
+            seg_mask: numpy array (h,w)
+        Return:
+            new_obj_mask: numpy array (h,w)
+        '''
+        new_obj_mask = (track_mask==0) * seg_mask
+        new_obj_ids = np.unique(new_obj_mask)
+        new_obj_ids = new_obj_ids[new_obj_ids!=0]
+        # obj_num = self.get_obj_num() + 1
+        obj_num = self.curr_idx
+        for idx in new_obj_ids:
+            new_obj_area = np.sum(new_obj_mask==idx)
+            obj_area = np.sum(seg_mask==idx)
+            if new_obj_area/obj_area < self.min_new_obj_iou or new_obj_area < self.min_area\
+                or obj_num > self.max_obj_num:
+                new_obj_mask[new_obj_mask==idx] = 0
+            else:
+                new_obj_mask[new_obj_mask==idx] = obj_num
+                obj_num += 1
+        return new_obj_mask
+        
+    def restart_tracker(self):
+        self.tracker.restart()
+
+    def seg_acc_bbox(self, origin_frame: np.ndarray, bbox: np.ndarray,):
+        ''''
+        Use bbox-prompt to get mask
+        Parameters:
+            origin_frame: H, W, C
+            bbox: [[x0, y0], [x1, y1]]
+        Return:
+            refined_merged_mask: numpy array (h, w)
+            masked_frame: numpy array (h, w, c)
+        '''
+        # get interactive_mask
+        interactive_mask = self.sam.segment_with_box(origin_frame, bbox)[0]
+        refined_merged_mask = self.add_mask(interactive_mask)
+
+        # draw mask
+        masked_frame = draw_mask(origin_frame.copy(), refined_merged_mask)
+
+        # draw bbox
+        masked_frame = cv2.rectangle(masked_frame, bbox[0], bbox[1], (0, 0, 255))
+
+        return refined_merged_mask, masked_frame
+
+    def seg_acc_click(self, origin_frame: np.ndarray, coords: np.ndarray, modes: np.ndarray, multimask=True):
+        '''
+        Use point-prompt to get mask
+        Parameters:
+            origin_frame: H, W, C
+            coords: nd.array [[x, y]]
+            modes: nd.array [[1]]
+        Return:
+            refined_merged_mask: numpy array (h, w)
+            masked_frame: numpy array (h, w, c)
+        '''
+        # get interactive_mask
+        interactive_mask = self.sam.segment_with_click(origin_frame, coords, modes, multimask)
+
+        refined_merged_mask = self.add_mask(interactive_mask)
+
+        # draw mask
+        masked_frame = draw_mask(origin_frame.copy(), refined_merged_mask)
+
+        # draw points
+        # self.everything_labels = np.array(self.everything_labels).astype(np.int64)
+        # self.everything_points = np.array(self.everything_points).astype(np.int64)
+
+        masked_frame = draw_points(coords, modes, masked_frame)
+
+        # draw outline
+        masked_frame = draw_outline(interactive_mask, masked_frame)
+
+        return refined_merged_mask, masked_frame
+
+    def add_mask(self, interactive_mask: np.ndarray):
+        '''
+        Merge interactive mask with self.origin_merged_mask
+        Parameters:
+            interactive_mask: numpy array (h, w)
+        Return:
+            refined_merged_mask: numpy array (h, w)
+        '''
+        if self.origin_merged_mask is None:
+            self.origin_merged_mask = np.zeros(interactive_mask.shape,dtype=np.uint8)
+
+        refined_merged_mask = self.origin_merged_mask.copy()
+        refined_merged_mask[interactive_mask > 0] = self.curr_idx
+
+        return refined_merged_mask
+    
+    def detect_and_seg(self, origin_frame: np.ndarray, grounding_caption, box_threshold, text_threshold, box_size_threshold=1, reset_image=False):
+        '''
+        Using Grounding-DINO to detect object acc Text-prompts
+        Retrun:
+            refined_merged_mask: numpy array (h, w)
+            annotated_frame: numpy array (h, w, 3)
+        '''
+        # backup id and origin-merged-mask
+        bc_id = self.curr_idx
+        bc_mask = self.origin_merged_mask
+
+        # get annotated_frame and boxes
+        annotated_frame, boxes = self.detector.run_grounding(origin_frame, grounding_caption, box_threshold, text_threshold)
+        for i in range(len(boxes)):
+            bbox = boxes[i]
+            if (bbox[1][0] - bbox[0][0]) * (bbox[1][1] - bbox[0][1]) > annotated_frame.shape[0] * annotated_frame.shape[1] * box_size_threshold:
+                continue
+            interactive_mask = self.sam.segment_with_box(origin_frame, bbox, reset_image)[0]
+            refined_merged_mask = self.add_mask(interactive_mask)
+            self.update_origin_merged_mask(refined_merged_mask)
+            self.curr_idx += 1
+
+        # reset origin_mask
+        self.reset_origin_merged_mask(bc_mask, bc_id)
+
+        return refined_merged_mask, annotated_frame
+
+if __name__ == '__main__':
+    from model_args import segtracker_args,sam_args,aot_args
+
+    Seg_Tracker = SegTracker(segtracker_args, sam_args, aot_args)
+    
+    # ------------------ detect test ----------------------
+    
+    origin_frame = cv2.imread('/data2/cym/Seg_Tra_any/Segment-and-Track-Anything/debug/point.png')
+    origin_frame = cv2.cvtColor(origin_frame, cv2.COLOR_BGR2RGB)
+    grounding_caption = "swan.water"
+    box_threshold = 0.25
+    text_threshold = 0.25
+
+    predicted_mask, annotated_frame = Seg_Tracker.detect_and_seg(origin_frame, grounding_caption, box_threshold, text_threshold)
+    masked_frame = draw_mask(annotated_frame, predicted_mask)
+    origin_frame = cv2.cvtColor(origin_frame, cv2.COLOR_RGB2BGR)
+
+    cv2.imwrite('./debug/masked_frame.png', masked_frame)
+    cv2.imwrite('./debug/x.png', annotated_frame)

aot/LICENSE

@@ -0,0 +1,29 @@
+BSD 3-Clause License
+
+Copyright (c) 2020, z-x-yang
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

aot/MODEL_ZOO.md

@@ -0,0 +1,115 @@
+## Model Zoo and Results
+
+### Environment and Settings
+- 4/1 NVIDIA V100 GPUs for training/evaluation.
+- Auto-mixed precision was enabled in training but disabled in evaluation.
+- Test-time augmentations were not used.
+- The inference resolution of DAVIS/YouTube-VOS was 480p/1.3x480p as [CFBI](https://github.com/z-x-yang/CFBI).
+- Fully online inference. We passed all the modules frame by frame.
+- Multi-object FPS was recorded instead of single-object one.
+
+### Pre-trained Models
+Stages:
+
+- `PRE`: the pre-training stage with static images.
+
+- `PRE_YTB_DAV`: the main-training stage with YouTube-VOS and DAVIS. All the kinds of evaluation share an **identical** model and the **same** parameters.
+
+
+| Model      | Param (M) |                                             PRE                                              |                                         PRE_YTB_DAV                                          |
+|:---------- |:---------:|:--------------------------------------------------------------------------------------------:|:--------------------------------------------------------------------------------------------:|
+| AOTT       |    5.7    | [gdrive](https://drive.google.com/file/d/1_513h8Hok9ySQPMs_dHgX5sPexUhyCmy/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/1owPmwV4owd_ll6GuilzklqTyAd0ZvbCu/view?usp=sharing) |
+| AOTS       |    7.0    | [gdrive](https://drive.google.com/file/d/1QUP0-VED-lOF1oX_ppYWnXyBjvUzJJB7/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/1beU5E6Mdnr_pPrgjWvdWurKAIwJSz1xf/view?usp=sharing) |
+| AOTB       |    8.3    | [gdrive](https://drive.google.com/file/d/11Bx8n_INAha1IdpHjueGpf7BrKmCJDvK/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/1hH-GOn4GAxHkV8ARcQzsUy8Ax6ndot-A/view?usp=sharing) |
+| AOTL       |    8.3    | [gdrive](https://drive.google.com/file/d/1WL6QCsYeT7Bt-Gain9ZIrNNXpR2Hgh29/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/1L1N2hkSPqrwGgnW9GyFHuG59_EYYfTG4/view?usp=sharing) |
+| R50-AOTL   |   14.9    | [gdrive](https://drive.google.com/file/d/1hS4JIvOXeqvbs-CokwV6PwZV-EvzE6x8/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/1qJDYn3Ibpquu4ffYoQmVjg1YCbr2JQep/view?usp=sharing) |
+| SwinB-AOTL |   65.4    | [gdrive](https://drive.google.com/file/d/1LlhKQiXD8JyZGGs3hZiNzcaCLqyvL9tj/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/192jCGQZdnuTsvX-CVra-KVZl2q1ZR0vW/view?usp=sharing) |
+
+| Model      | Param (M) |                                             PRE                                              |                                         PRE_YTB_DAV                                          |
+|:---------- |:---------:|:--------------------------------------------------------------------------------------------:|:--------------------------------------------------------------------------------------------:|
+| DeAOTT       |    7.2   | [gdrive](https://drive.google.com/file/d/11C1ZBoFpL3ztKtINS8qqwPSldfYXexFK/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/1ThWIZQS03cYWx1EKNN8MIMnJS5eRowzr/view?usp=sharing) |
+| DeAOTS       |    10.2   | [gdrive](https://drive.google.com/file/d/1uUidrWVoaP9A5B5-EzQLbielUnRLRF3j/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/1YwIAV5tBtn5spSFxKLBQBEQGwPHyQlHi/view?usp=sharing) |
+| DeAOTB       |    13.2   | [gdrive](https://drive.google.com/file/d/1bEQr6vIgQMVITrSOtxWTMgycKpS0cor9/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/1BHxsonnvJXylqHlZ1zJHHc-ymKyq-CFf/view?usp=sharing) |
+| DeAOTL       |    13.2   | [gdrive](https://drive.google.com/file/d/1_vBL4KJlmBy0oBE4YFDOvsYL1ZtpEL32/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/18elNz_wi9JyVBcIUYKhRdL08MA-FqHD5/view?usp=sharing) |
+| R50-DeAOTL   |    19.8   | [gdrive](https://drive.google.com/file/d/1sTRQ1g0WCpqVCdavv7uJiZNkXunBt3-R/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/1QoChMkTVxdYZ_eBlZhK2acq9KMQZccPJ/view?usp=sharing) |
+| SwinB-DeAOTL |    70.3   | [gdrive](https://drive.google.com/file/d/16BZEE53no8CxT-pPLDC2q1d6Xlg8mWPU/view?usp=sharing) | [gdrive](https://drive.google.com/file/d/1g4E-F0RPOx9Nd6J7tU9AE1TjsouL4oZq/view?usp=sharing) |
+
+To use our pre-trained model to infer, a simple way is to set `--model` and `--ckpt_path` to your downloaded checkpoint's model type and file path when running `eval.py`.
+
+### YouTube-VOS 2018 val
+`ALL-F`: all frames. The default evaluation setting of YouTube-VOS is 6fps, but 30fps sequences (all the frames) are also supplied by the dataset organizers. We noticed that many VOS methods prefer to evaluate with 30fps videos. Thus, we also supply our results here. Denser video sequences can significantly improve VOS performance when using the memory reading strategy (like AOTL, R50-AOTL, and SwinB-AOTL), but the efficiency will be influenced since more memorized frames are stored for object matching.
+| Model        |    Stage    |   FPS    | All-F |   Mean   |  J Seen  |  F Seen  | J Unseen | F Unseen |                                         Predictions                                          |
+|:------------ |:-----------:|:--------:|:-----:|:--------:|:--------:|:--------:|:--------:|:--------:|:--------------------------------------------------------------------------------------------:|
+| AOTT         | PRE_YTB_DAV |   41.0   |       |   80.2   |   80.4   |   85.0   |   73.6   |   81.7   | [gdrive](https://drive.google.com/file/d/1u8mvPRT08ENZHsw9Xf_4C6Sv9BoCzENR/view?usp=sharing) |
+| AOTT         | PRE_YTB_DAV |   41.0   |   √   |   80.9   |   80.0   |   84.7   |   75.2   |   83.5   | [gdrive](https://drive.google.com/file/d/1RGMI5-29Z0odq73rt26eCxOUYUd-fvVv/view?usp=sharing) |
+| DeAOTT       | PRE_YTB_DAV | **53.4** |       | **82.0** | **81.6** | **86.3** | **75.8** | **84.2** |    -                                                                                          |
+| AOTS         | PRE_YTB_DAV |   27.1   |       |   82.9   |   82.3   |   87.0   |   77.1   |   85.1   | [gdrive](https://drive.google.com/file/d/1a4-rNnxjMuPBq21IKo31WDYZXMPgS7r2/view?usp=sharing) |
+| AOTS         | PRE_YTB_DAV |   27.1   |   √   |   83.0   |   82.2   |   87.0   |   77.3   |   85.7   | [gdrive](https://drive.google.com/file/d/1Z0cndyoCw5Na6u-VFRE8CyiIG2RbMIUO/view?usp=sharing) |
+| DeAOTS       | PRE_YTB_DAV | **38.7** |       | **84.0** | **83.3** | **88.3** | **77.9** | **86.6** |    -                                                                                          |
+| AOTB         | PRE_YTB_DAV |   20.5   |       |   84.0   |   83.2   |   88.1   |   78.0   |   86.5   | [gdrive](https://drive.google.com/file/d/1J5nhuQbbjVLYNXViBIgo21ddQy-MiOLG/view?usp=sharing) |
+| AOTB         | PRE_YTB_DAV |   20.5   |   √   |   84.1   |   83.6   |   88.5   |   78.0   |   86.5   | [gdrive](https://drive.google.com/file/d/1gFaweB_GTJjHzSD61v_ZsY9K7UEND30O/view?usp=sharing) |
+| DeAOTB       | PRE_YTB_DAV | **30.4** |       | **84.6** | **83.9** | **88.9** | **78.5** | **87.0** |    -                                                                                          |
+| AOTL         | PRE_YTB_DAV |   16.0   |       |   84.1   |   83.2   |   88.2   |   78.2   |   86.8   | [gdrive](https://drive.google.com/file/d/1kS8KWQ2L3wzxt44ROLTxwZOT7ZpT8Igc/view?usp=sharing) |
+| AOTL         | PRE_YTB_DAV |   6.5    |   √   |   84.5   |   83.7   |   88.8   |   78.4   | **87.1** | [gdrive](https://drive.google.com/file/d/1Rpm3e215kJOUvb562lJ2kYg2I3hkrxiM/view?usp=sharing) |
+| DeAOTL       | PRE_YTB_DAV | **24.7** |       | **84.8** | **84.2** | **89.4** | **78.6** |   87.0   |    -                                                                                          |
+| R50-AOTL     | PRE_YTB_DAV |   14.9   |       |   84.6   |   83.7   |   88.5   |   78.8   |   87.3   | [gdrive](https://drive.google.com/file/d/1nbJZ1bbmEgyK-bg6HQ8LwCz5gVJ6wzIZ/view?usp=sharing) |
+| R50-AOTL     | PRE_YTB_DAV |   6.4    |   √   |   85.5   |   84.5   |   89.5   |   79.6   |   88.2   | [gdrive](https://drive.google.com/file/d/1NbB54ZhYvfJh38KFOgovYYPjWopd-2TE/view?usp=sharing) |
+| R50-DeAOTL   | PRE_YTB_DAV | **22.4** |       | **86.0** | **84.9** | **89.9** | **80.4** | **88.7** |    -                                                                                         |
+| SwinB-AOTL   | PRE_YTB_DAV |   9.3    |       |   84.7   |   84.5   |   89.5   |   78.1   |   86.7   | [gdrive](https://drive.google.com/file/d/1QFowulSY0LHfpsjUV8ZE9rYc55L9DOC7/view?usp=sharing) |
+| SwinB-AOTL   | PRE_YTB_DAV |   5.2    |   √   |   85.1   |   85.1   |   90.1   |   78.4   |   86.9   | [gdrive](https://drive.google.com/file/d/1TulhVOhh01rkssNYbOQASeWKu7CQ5Azx/view?usp=sharing) |
+| SwinB-DeAOTL | PRE_YTB_DAV | **11.9** |       | **86.2** | **85.6** | **90.6** | **80.0** | **88.4** |    -                                                                                  |
+
+### YouTube-VOS 2019 val
+| Model        |    Stage    |   FPS    | All-F |   Mean   |  J Seen  |  F Seen  | J Unseen | F Unseen |                                         Predictions                                          |
+|:------------ |:-----------:|:--------:|:-----:|:--------:|:--------:|:--------:|:--------:|:--------:|:--------------------------------------------------------------------------------------------:|
+| AOTT         | PRE_YTB_DAV |   41.0   |       |   80.0   |   79.8   |   84.2   |   74.1   |   82.1   | [gdrive](https://drive.google.com/file/d/1zzyhN1XYtajte5nbZ7opOdfXeDJgCxC5/view?usp=sharing) |
+| AOTT         | PRE_YTB_DAV |   41.0   |   √   |   80.9   |   79.9   |   84.4   |   75.6   |   83.8   | [gdrive](https://drive.google.com/file/d/1V_5vi9dAXOis_WrDieacSESm7OX20Bv-/view?usp=sharing) |
+| DeAOTT       | PRE_YTB_DAV | **53.4** |       | **82.0** | **81.2** | **85.6** | **76.4** | **84.7** |     -                                                                                         |
+| AOTS         | PRE_YTB_DAV |   27.1   |       |   82.7   |   81.9   |   86.5   |   77.3   |   85.2   | [gdrive](https://drive.google.com/file/d/11YdkUeyjkTv8Uw7xMgPCBzJs6v5SDt6n/view?usp=sharing) |
+| AOTS         | PRE_YTB_DAV |   27.1   |   √   |   82.8   |   81.9   |   86.5   |   77.3   |   85.6   | [gdrive](https://drive.google.com/file/d/1UhyurGTJeAw412czU3_ebzNwF8xQ4QG_/view?usp=sharing) |
+| DeAOTS       | PRE_YTB_DAV | **38.7** |       | **83.8** | **82.8** | **87.5** | **78.1** | **86.8** |     -                                                                                         |
+| AOTB         | PRE_YTB_DAV |   20.5   |       |   84.0   |   83.1   |   87.7   |   78.5   |   86.8   | [gdrive](https://drive.google.com/file/d/1NeI8cT4kVqTqVWAwtwiga1rkrvksNWaO/view?usp=sharing) |
+| AOTB         | PRE_YTB_DAV |   20.5   |   √   |   84.1   |   83.3   |   88.0   |   78.2   |   86.7   | [gdrive](https://drive.google.com/file/d/1kpYV2XFR0sOfLWD-wMhd-nUO6CFiLjlL/view?usp=sharing) |
+| DeAOTB       | PRE_YTB_DAV | **30.4** |       | **84.6** | **83.5** | **88.3** | **79.1** | **87.5** |     -                                                                                         |
+| AOTL         | PRE_YTB_DAV |   16.0   |       |   84.0   |   82.8   |   87.6   |   78.6   |   87.1   | [gdrive](https://drive.google.com/file/d/1qKLlNXxmT31bW0weEHI_zAf4QwU8Lhou/view?usp=sharing) |
+| AOTL         | PRE_YTB_DAV |   6.5    |   √   |   84.2   |   83.0   |   87.8   |   78.7   |   87.3   | [gdrive](https://drive.google.com/file/d/1o3fwZ0cH71bqHSA3bYNjhP4GGv9Vyuwa/view?usp=sharing) |
+| DeAOTL       | PRE_YTB_DAV | **24.7** |       | **84.7** | **83.8** | **88.8** | **79.0** | **87.2** |     -                                                                                         |
+| R50-AOTL     | PRE_YTB_DAV |   14.9   |       |   84.4   |   83.4   |   88.1   |   78.7   |   87.2   | [gdrive](https://drive.google.com/file/d/1I7ooSp8EYfU6fvkP6QcCMaxeencA68AH/view?usp=sharing) |
+| R50-AOTL     | PRE_YTB_DAV |   6.4    |   √   |   85.3   |   83.9   |   88.8   |   79.9   |   88.5   | [gdrive](https://drive.google.com/file/d/1OGqlkEu0uXa8QVWIVz_M5pmXXiYR2sh3/view?usp=sharing) |
+| R50-DeAOTL   | PRE_YTB_DAV | **22.4** |       | **85.9** | **84.6** | **89.4** | **80.8** | **88.9** |     -                                                                                         |
+| SwinB-AOTL   | PRE_YTB_DAV |   9.3    |       |   84.7   |   84.0   |   88.8   |   78.7   |   87.1   | [gdrive](https://drive.google.com/file/d/1fPzCxi5GM7N2sLKkhoTC2yoY_oTQCHp1/view?usp=sharing) |
+| SwinB-AOTL   | PRE_YTB_DAV |   5.2    |   √   |   85.3   |   84.6   |   89.5   |   79.3   |   87.7   | [gdrive](https://drive.google.com/file/d/1e3D22s_rJ7Y2X2MHo7x5lcNtwmHFlwYB/view?usp=sharing) |
+| SwinB-DeAOTL | PRE_YTB_DAV | **11.9** |       | **86.1** | **85.3** | **90.2** | **80.4** | **88.6** |     -                                                                                         |
+
+### DAVIS-2017 test
+
+| Model      |    Stage    | FPS  |   Mean   | J Score  | F Score  | Predictions |
+| ---------- |:-----------:|:----:|:--------:|:--------:|:--------:|:----:|
+| AOTT       | PRE_YTB_DAV | **51.4** |   73.7   |   70.0   |   77.3   | [gdrive](https://drive.google.com/file/d/14Pu-6Uz4rfmJ_WyL2yl57KTx_pSSUNAf/view?usp=sharing) |
+| AOTS       | PRE_YTB_DAV | 40.0 |   75.2   |   71.4   |   78.9   | [gdrive](https://drive.google.com/file/d/1zzAPZCRLgnBWuAXqejPPEYLqBxu67Rj1/view?usp=sharing) |
+| AOTB       | PRE_YTB_DAV | 29.6 |   77.4   |   73.7   |   81.1   | [gdrive](https://drive.google.com/file/d/1WpQ-_Jrs7Ssfw0oekrejM2OVWEx_tBN1/view?usp=sharing) |
+| AOTL       | PRE_YTB_DAV | 18.7 |   79.3   |   75.5   |   83.2   | [gdrive](https://drive.google.com/file/d/1rP1Zdgc0N1d8RR2EaXMz3F-o5zqcNVe8/view?usp=sharing) |
+| R50-AOTL   | PRE_YTB_DAV | 18.0 |   79.5   |   76.0   |   83.0   | [gdrive](https://drive.google.com/file/d/1iQ5iNlvlS-In586ZNc4LIZMSdNIWDvle/view?usp=sharing) |
+| SwinB-AOTL | PRE_YTB_DAV | 12.1  | **82.1** | **78.2** | **85.9** | [gdrive](https://drive.google.com/file/d/1oVt4FPcZdfVHiOxjYYKef0q7Ovy4f5Q_/view?usp=sharing) |
+
+### DAVIS-2017 val
+
+| Model      |    Stage    | FPS  |   Mean   | J Score  |  F Score  | Predictions |
+| ---------- |:-----------:|:----:|:--------:|:--------:|:---------:|:----:|
+| AOTT       | PRE_YTB_DAV | **51.4** |   79.2   |   76.5   |   81.9    | [gdrive](https://drive.google.com/file/d/10OUFhK2Sz-hOJrTDoTI0mA45KO1qodZt/view?usp=sharing) |
+| AOTS       | PRE_YTB_DAV | 40.0 |   82.1   |   79.3   |   84.8    | [gdrive](https://drive.google.com/file/d/1T-JTYyksWlq45jxcLjnRaBvvYUhWgHFH/view?usp=sharing) |
+| AOTB       | PRE_YTB_DAV | 29.6 |   83.3   |   80.6   |   85.9    | [gdrive](https://drive.google.com/file/d/1EVUnxQm9TLBTuwK82QyiSKk9R9V8NwRL/view?usp=sharing) |
+| AOTL       | PRE_YTB_DAV | 18.7 |   83.6   |   80.8   |   86.3    | [gdrive](https://drive.google.com/file/d/1CFauSni2BxAe_fcl8W_6bFByuwJRbDYm/view?usp=sharing) |
+| R50-AOTL   | PRE_YTB_DAV | 18.0 |   85.2   |   82.5   |   87.9    | [gdrive](https://drive.google.com/file/d/1vjloxnP8R4PZdsH2DDizfU2CrkdRHHyo/view?usp=sharing) |
+| SwinB-AOTL | PRE_YTB_DAV | 12.1  | **85.9** | **82.9** | **88.9** | [gdrive](https://drive.google.com/file/d/1tYCbKOas0i7Et2iyUAyDwaXnaD9YWxLr/view?usp=sharing) |
+
+### DAVIS-2016 val
+
+| Model      |    Stage    | FPS  |   Mean   | J Score  | F Score  | Predictions |
+| ---------- |:-----------:|:----:|:--------:|:--------:|:--------:|:----:|
+| AOTT       | PRE_YTB_DAV | **51.4** |   87.5   |   86.5   |   88.4   | [gdrive](https://drive.google.com/file/d/1LeW8WQhnylZ3umT7E379KdII92uUsGA9/view?usp=sharing) |
+| AOTS       | PRE_YTB_DAV | 40.0 |   89.6   |   88.6   |   90.5   | [gdrive](https://drive.google.com/file/d/1vqGei5tLu1FPVrTi5bwRAsaGy3Upf7B1/view?usp=sharing) |
+| AOTB       | PRE_YTB_DAV | 29.6 |   90.9   |   89.6   |   92.1   | [gdrive](https://drive.google.com/file/d/1qAppo2uOVu0FbE9t1FBUpymC3yWgw1LM/view?usp=sharing) |
+| AOTL       | PRE_YTB_DAV | 18.7 |   91.1   |   89.5   |   92.7   | [gdrive](https://drive.google.com/file/d/1g6cjYhgBWjMaY3RGAm31qm3SPEF3QcKV/view?usp=sharing) |
+| R50-AOTL   | PRE_YTB_DAV | 18.0 |   91.7   |   90.4   |   93.0   | [gdrive](https://drive.google.com/file/d/1QzxojqWKsvRf53K2AgKsK523ZVuYU4O-/view?usp=sharing) |
+| SwinB-AOTL | PRE_YTB_DAV | 12.1  | **92.2** | **90.6** | **93.8** | [gdrive](https://drive.google.com/file/d/1RIqUtAyVnopeogfT520d7a0yiULg1obp/view?usp=sharing) |

aot/README.md

@@ -0,0 +1,152 @@
+# AOT Series Frameworks in PyTorch
+
+[![PWC](https://img.shields.io/endpoint.svg?url=https://paperswithcode.com/badge/decoupling-features-in-hierarchical/semi-supervised-video-object-segmentation-on-15)](https://paperswithcode.com/sota/semi-supervised-video-object-segmentation-on-15?p=decoupling-features-in-hierarchical)
+[![PWC](https://img.shields.io/endpoint.svg?url=https://paperswithcode.com/badge/associating-objects-with-scalable/video-object-segmentation-on-youtube-vos)](https://paperswithcode.com/sota/video-object-segmentation-on-youtube-vos?p=associating-objects-with-scalable)
+[![PWC](https://img.shields.io/endpoint.svg?url=https://paperswithcode.com/badge/associating-objects-with-scalable/semi-supervised-video-object-segmentation-on-18)](https://paperswithcode.com/sota/semi-supervised-video-object-segmentation-on-18?p=associating-objects-with-scalable)
+[![PWC](https://img.shields.io/endpoint.svg?url=https://paperswithcode.com/badge/associating-objects-with-scalable/semi-supervised-video-object-segmentation-on-1)](https://paperswithcode.com/sota/semi-supervised-video-object-segmentation-on-1?p=associating-objects-with-scalable)
+[![PWC](https://img.shields.io/endpoint.svg?url=https://paperswithcode.com/badge/associating-objects-with-scalable/visual-object-tracking-on-davis-2017)](https://paperswithcode.com/sota/visual-object-tracking-on-davis-2017?p=associating-objects-with-scalable)
+[![PWC](https://img.shields.io/endpoint.svg?url=https://paperswithcode.com/badge/associating-objects-with-scalable/visual-object-tracking-on-davis-2016)](https://paperswithcode.com/sota/visual-object-tracking-on-davis-2016?p=associating-objects-with-scalable)
+
+A modular reference PyTorch implementation of AOT series frameworks:
+- **DeAOT**: Decoupling Features in Hierachical Propagation for Video Object Segmentation (NeurIPS 2022, Spotlight) [[OpenReview](https://openreview.net/forum?id=DgM7-7eMkq0)][[PDF](https://arxiv.org/pdf/2210.09782.pdf)]
+<img src="source/overview_deaot.png" width="90%"/>
+
+- **AOT**: Associating Objects with Transformers for Video Object Segmentation (NeurIPS 2021, Score 8/8/7/8) [[OpenReview](https://openreview.net/forum?id=hl3v8io3ZYt)][[PDF](https://arxiv.org/abs/2106.02638)]
+<img src="source/overview.png" width="90%"/>
+
+An extension of AOT, [AOST](https://arxiv.org/abs/2203.11442) (under review), is available now. AOST is a more robust and flexible framework, supporting run-time speed-accuracy trade-offs.
+
+## Examples
+Benchmark examples:
+
+<img src="source/some_results.png" width="81%"/>
+
+General examples (Messi and Kobe):
+
+<img src="source/messi.gif" width="45%"/> <img src="source/kobe.gif" width="45%"/>
+
+## Highlights
+- **High performance:** up to **85.5%** ([R50-AOTL](MODEL_ZOO.md#youtube-vos-2018-val)) on YouTube-VOS 2018 and **82.1%** ([SwinB-AOTL]((MODEL_ZOO.md#youtube-vos-2018-val))) on DAVIS-2017 Test-dev under standard settings (without any test-time augmentation and post processing). 
+- **High efficiency:** up to **51fps** ([AOTT](MODEL_ZOO.md#davis-2017-test)) on DAVIS-2017 (480p) even with **10** objects and **41fps** on YouTube-VOS (1.3x480p). AOT can process multiple objects (less than a pre-defined number, 10 is the default) as efficiently as processing a single object. This project also supports inferring any number of objects together within a video by automatic separation and aggregation.
+- **Multi-GPU training and inference**
+- **Mixed precision training and inference** 
+- **Test-time augmentation:** multi-scale and flipping augmentations are supported.
+
+## Requirements
+   * Python3
+   * pytorch >= 1.7.0 and torchvision
+   * opencv-python
+   * Pillow
+   * Pytorch Correlation (Recommend to install from [source](https://github.com/ClementPinard/Pytorch-Correlation-extension) instead of using `pip`. **The project can also work without this module but will lose some efficiency of the short-term attention**.)
+
+Optional:
+   * scikit-image (if you want to run our **Demo**, please install)
+
+## Model Zoo and Results
+Pre-trained models, benckmark scores, and pre-computed results reproduced by this project can be found in [MODEL_ZOO.md](MODEL_ZOO.md).
+
+## Demo - Panoptic Propagation
+We provide a simple demo to demonstrate AOT's effectiveness. The demo will propagate more than **40** objects, including semantic regions (like sky) and instances (like person), together within a single complex scenario and predict its video panoptic segmentation.
+
+To run the demo, download the [checkpoint](https://drive.google.com/file/d/1qJDYn3Ibpquu4ffYoQmVjg1YCbr2JQep/view?usp=sharing) of R50-AOTL into [pretrain_models](pretrain_models), and then run:
+```bash
+python tools/demo.py
+```
+which will predict the given scenarios in the resolution of 1.3x480p. You can also run this demo with other AOTs ([MODEL_ZOO.md](MODEL_ZOO.md)) by setting `--model` (model type) and `--ckpt_path` (checkpoint path).
+
+Two scenarios from [VSPW](https://www.vspwdataset.com/home) are supplied in [datasets/Demo](datasets/Demo):
+
+- 1001_3iEIq5HBY1s: 44 objects. 1080P.
+- 1007_YCTBBdbKSSg: 43 objects. 1080P.
+
+Results:
+
+<img src="source/1001_3iEIq5HBY1s.gif" width="45%"/>  <img src="source/1007_YCTBBdbKSSg.gif" width="45%"/>
+
+
+## Getting Started
+0. Prepare a valid environment follow the [requirements](#requirements).
+
+1. Prepare datasets:
+
+    Please follow the below instruction to prepare datasets in each corresponding folder.
+    * **Static** 
+    
+        [datasets/Static](datasets/Static): pre-training dataset with static images. Guidance can be found in [AFB-URR](https://github.com/xmlyqing00/AFB-URR), which we referred to in the implementation of the pre-training.
+    * **YouTube-VOS**
+
+        A commonly-used large-scale VOS dataset.
+
+        [datasets/YTB/2019](datasets/YTB/2019): version 2019, download [link](https://drive.google.com/drive/folders/1BWzrCWyPEmBEKm0lOHe5KLuBuQxUSwqz?usp=sharing). `train` is required for training. `valid` (6fps) and `valid_all_frames` (30fps, optional) are used for evaluation.
+
+        [datasets/YTB/2018](datasets/YTB/2018): version 2018, download [link](https://drive.google.com/drive/folders/1bI5J1H3mxsIGo7Kp-pPZU8i6rnykOw7f?usp=sharing). Only `valid` (6fps) and `valid_all_frames` (30fps, optional) are required for this project and used for evaluation.
+
+    * **DAVIS**
+
+        A commonly-used small-scale VOS dataset.
+
+        [datasets/DAVIS](datasets/DAVIS): [TrainVal](https://data.vision.ee.ethz.ch/csergi/share/davis/DAVIS-2017-trainval-480p.zip) (480p) contains both the training and validation split. [Test-Dev](https://data.vision.ee.ethz.ch/csergi/share/davis/DAVIS-2017-test-dev-480p.zip) (480p) contains the Test-dev split. The [full-resolution version](https://davischallenge.org/davis2017/code.html) is also supported for training and evaluation but not required.
+
+
+2. Prepare ImageNet pre-trained encoders
+
+    Select and download below checkpoints into [pretrain_models](pretrain_models):
+
+    - [MobileNet-V2](https://download.pytorch.org/models/mobilenet_v2-b0353104.pth) (default encoder)
+    - [MobileNet-V3](https://download.pytorch.org/models/mobilenet_v3_large-8738ca79.pth)
+    - [ResNet-50](https://download.pytorch.org/models/resnet50-0676ba61.pth)
+    - [ResNet-101](https://download.pytorch.org/models/resnet101-63fe2227.pth)
+    - [ResNeSt-50](https://github.com/zhanghang1989/ResNeSt/releases/download/weights_step1/resnest50-528c19ca.pth)
+    - [ResNeSt-101](https://github.com/zhanghang1989/ResNeSt/releases/download/weights_step1/resnest101-22405ba7.pth)
+    - [Swin-Base](https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_base_patch4_window7_224_22k.pth)
+
+    The current default training configs are not optimized for encoders larger than ResNet-50. If you want to use larger encoders, we recommend early stopping the main-training stage at 80,000 iterations (100,000 in default) to avoid over-fitting on the seen classes of YouTube-VOS.
+
+
+
+3. Training and Evaluation
+
+    The [example script](train_eval.sh) will train AOTT with 2 stages using 4 GPUs and auto-mixed precision (`--amp`). The first stage is a pre-training stage using `Static` dataset, and the second stage is a main-training stage, which uses both `YouTube-VOS 2019 train` and `DAVIS-2017 train` for training, resulting in a model that can generalize to different domains (YouTube-VOS and DAVIS) and different frame rates (6fps, 24fps, and 30fps).
+
+    Notably, you can use only the `YouTube-VOS 2019 train` split in the second stage by changing `pre_ytb_dav` to `pre_ytb`, which leads to better YouTube-VOS performance on unseen classes. Besides, if you don't want to do the first stage, you can start the training from stage `ytb`, but the performance will drop about 1~2% absolutely.
+
+    After the training is finished (about 0.6 days for each stage with 4 Tesla V100 GPUs), the [example script](train_eval.sh) will evaluate the model on YouTube-VOS and DAVIS, and the results will be packed into Zip files. For calculating scores, please use official YouTube-VOS servers ([2018 server](https://competitions.codalab.org/competitions/19544) and [2019 server](https://competitions.codalab.org/competitions/20127)), official [DAVIS toolkit](https://github.com/davisvideochallenge/davis-2017) (for Val), and official [DAVIS server](https://competitions.codalab.org/competitions/20516#learn_the_details) (for Test-dev).
+
+## Adding your own dataset
+Coming
+
+## Troubleshooting
+Waiting
+
+## TODO
+- [ ] Code documentation
+- [ ] Adding your own dataset
+- [ ] Results with test-time augmentations in Model Zoo
+- [ ] Support gradient accumulation
+- [x] Demo tool
+
+## Citations
+Please consider citing the related paper(s) in your publications if it helps your research.
+```
+@inproceedings{yang2022deaot,
+  title={Decoupling Features in Hierarchical Propagation for Video Object Segmentation},
+  author={Yang, Zongxin and Yang, Yi},
+  booktitle={Advances in Neural Information Processing Systems (NeurIPS)},
+  year={2022}
+}
+@article{yang2021aost,
+  title={Scalable Multi-object Identification for Video Object Segmentation},
+  author={Yang, Zongxin and Miao, Jiaxu and Wang, Xiaohan and Wei, Yunchao and Yang, Yi},
+  journal={arXiv preprint arXiv:2203.11442},
+  year={2022}
+}
+@inproceedings{yang2021aot,
+  title={Associating Objects with Transformers for Video Object Segmentation},
+  author={Yang, Zongxin and Wei, Yunchao and Yang, Yi},
+  booktitle={Advances in Neural Information Processing Systems (NeurIPS)},
+  year={2021}
+}
+```
+
+## License
+This project is released under the BSD-3-Clause license. See [LICENSE](LICENSE) for additional details.

aot/configs/default.py

@@ -0,0 +1,138 @@
+import os
+import importlib
+
+
+class DefaultEngineConfig():
+    def __init__(self, exp_name='default', model='aott'):
+        model_cfg = importlib.import_module('configs.models.' +
+                                            model).ModelConfig()
+        self.__dict__.update(model_cfg.__dict__)  # add model config
+
+        self.EXP_NAME = exp_name + '_' + self.MODEL_NAME
+
+        self.STAGE_NAME = 'YTB'
+
+        self.DATASETS = ['youtubevos']
+        self.DATA_WORKERS = 8
+        self.DATA_RANDOMCROP = (465,
+                                465) if self.MODEL_ALIGN_CORNERS else (464,
+                                                                       464)
+        self.DATA_RANDOMFLIP = 0.5
+        self.DATA_MAX_CROP_STEPS = 10
+        self.DATA_SHORT_EDGE_LEN = 480
+        self.DATA_MIN_SCALE_FACTOR = 0.7
+        self.DATA_MAX_SCALE_FACTOR = 1.3
+        self.DATA_RANDOM_REVERSE_SEQ = True
+        self.DATA_SEQ_LEN = 5
+        self.DATA_DAVIS_REPEAT = 5
+        self.DATA_RANDOM_GAP_DAVIS = 12  # max frame interval between two sampled frames for DAVIS (24fps)
+        self.DATA_RANDOM_GAP_YTB = 3  # max frame interval between two sampled frames for YouTube-VOS (6fps)
+        self.DATA_DYNAMIC_MERGE_PROB = 0.3
+
+        self.PRETRAIN = True
+        self.PRETRAIN_FULL = False  # if False, load encoder only
+        self.PRETRAIN_MODEL = './data_wd/pretrain_model/mobilenet_v2.pth'
+        # self.PRETRAIN_MODEL = './pretrain_models/mobilenet_v2-b0353104.pth'
+
+        self.TRAIN_TOTAL_STEPS = 100000
+        self.TRAIN_START_STEP = 0
+        self.TRAIN_WEIGHT_DECAY = 0.07
+        self.TRAIN_WEIGHT_DECAY_EXCLUSIVE = {
+            # 'encoder.': 0.01
+        }
+        self.TRAIN_WEIGHT_DECAY_EXEMPTION = [
+            'absolute_pos_embed', 'relative_position_bias_table',
+            'relative_emb_v', 'conv_out'
+        ]
+        self.TRAIN_LR = 2e-4
+        self.TRAIN_LR_MIN = 2e-5 if 'mobilenetv2' in self.MODEL_ENCODER else 1e-5
+        self.TRAIN_LR_POWER = 0.9
+        self.TRAIN_LR_ENCODER_RATIO = 0.1
+        self.TRAIN_LR_WARM_UP_RATIO = 0.05
+        self.TRAIN_LR_COSINE_DECAY = False
+        self.TRAIN_LR_RESTART = 1
+        self.TRAIN_LR_UPDATE_STEP = 1
+        self.TRAIN_AUX_LOSS_WEIGHT = 1.0
+        self.TRAIN_AUX_LOSS_RATIO = 1.0
+        self.TRAIN_OPT = 'adamw'
+        self.TRAIN_SGD_MOMENTUM = 0.9
+        self.TRAIN_GPUS = 4
+        self.TRAIN_BATCH_SIZE = 16
+        self.TRAIN_TBLOG = False
+        self.TRAIN_TBLOG_STEP = 50
+        self.TRAIN_LOG_STEP = 20
+        self.TRAIN_IMG_LOG = True
+        self.TRAIN_TOP_K_PERCENT_PIXELS = 0.15
+        self.TRAIN_SEQ_TRAINING_FREEZE_PARAMS = ['patch_wise_id_bank']
+        self.TRAIN_SEQ_TRAINING_START_RATIO = 0.5
+        self.TRAIN_HARD_MINING_RATIO = 0.5
+        self.TRAIN_EMA_RATIO = 0.1
+        self.TRAIN_CLIP_GRAD_NORM = 5.
+        self.TRAIN_SAVE_STEP = 5000
+        self.TRAIN_MAX_KEEP_CKPT = 8
+        self.TRAIN_RESUME = False
+        self.TRAIN_RESUME_CKPT = None
+        self.TRAIN_RESUME_STEP = 0
+        self.TRAIN_AUTO_RESUME = True
+        self.TRAIN_DATASET_FULL_RESOLUTION = False
+        self.TRAIN_ENABLE_PREV_FRAME = False
+        self.TRAIN_ENCODER_FREEZE_AT = 2
+        self.TRAIN_LSTT_EMB_DROPOUT = 0.
+        self.TRAIN_LSTT_ID_DROPOUT = 0.
+        self.TRAIN_LSTT_DROPPATH = 0.1
+        self.TRAIN_LSTT_DROPPATH_SCALING = False
+        self.TRAIN_LSTT_DROPPATH_LST = False
+        self.TRAIN_LSTT_LT_DROPOUT = 0.
+        self.TRAIN_LSTT_ST_DROPOUT = 0.
+
+        self.TEST_GPU_ID = 0
+        self.TEST_GPU_NUM = 1
+        self.TEST_FRAME_LOG = False
+        self.TEST_DATASET = 'youtubevos'
+        self.TEST_DATASET_FULL_RESOLUTION = False
+        self.TEST_DATASET_SPLIT = 'val'
+        self.TEST_CKPT_PATH = None
+        # if "None", evaluate the latest checkpoint.
+        self.TEST_CKPT_STEP = None
+        self.TEST_FLIP = False
+        self.TEST_MULTISCALE = [1]
+        self.TEST_MAX_SHORT_EDGE = None
+        self.TEST_MAX_LONG_EDGE = 800 * 1.3
+        self.TEST_WORKERS = 4
+
+        # GPU distribution
+        self.DIST_ENABLE = True
+        self.DIST_BACKEND = "nccl"  # "gloo"
+        self.DIST_URL = "tcp://127.0.0.1:13241"
+        self.DIST_START_GPU = 0
+
+    def init_dir(self):
+        self.DIR_DATA = '../VOS02/datasets'#'./datasets'
+        self.DIR_DAVIS = os.path.join(self.DIR_DATA, 'DAVIS')
+        self.DIR_YTB = os.path.join(self.DIR_DATA, 'YTB')
+        self.DIR_STATIC = os.path.join(self.DIR_DATA, 'Static')
+
+        self.DIR_ROOT = './'#'./data_wd/youtube_vos_jobs'
+
+        self.DIR_RESULT = os.path.join(self.DIR_ROOT, 'result', self.EXP_NAME,
+                                       self.STAGE_NAME)
+        self.DIR_CKPT = os.path.join(self.DIR_RESULT, 'ckpt')
+        self.DIR_EMA_CKPT = os.path.join(self.DIR_RESULT, 'ema_ckpt')
+        self.DIR_LOG = os.path.join(self.DIR_RESULT, 'log')
+        self.DIR_TB_LOG = os.path.join(self.DIR_RESULT, 'log', 'tensorboard')
+        # self.DIR_IMG_LOG = os.path.join(self.DIR_RESULT, 'log', 'img')
+        # self.DIR_EVALUATION = os.path.join(self.DIR_RESULT, 'eval')
+        self.DIR_IMG_LOG = './img_logs'
+        self.DIR_EVALUATION = './results'
+
+        for path in [
+                self.DIR_RESULT, self.DIR_CKPT, self.DIR_EMA_CKPT,
+                self.DIR_LOG, self.DIR_EVALUATION, self.DIR_IMG_LOG,
+                self.DIR_TB_LOG
+        ]:
+            if not os.path.isdir(path):
+                try:
+                    os.makedirs(path)
+                except Exception as inst:
+                    print(inst)
+                    print('Failed to make dir: {}.'.format(path))

aot/configs/models/aotb.py

@@ -0,0 +1,9 @@
+import os
+from .default import DefaultModelConfig
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'AOTB'
+
+        self.MODEL_LSTT_NUM = 3

aot/configs/models/aotl.py

@@ -0,0 +1,13 @@
+import os
+from .default import DefaultModelConfig
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'AOTL'
+
+        self.MODEL_LSTT_NUM = 3
+
+        self.TRAIN_LONG_TERM_MEM_GAP = 2
+
+        self.TEST_LONG_TERM_MEM_GAP = 5

aot/configs/models/aots.py

@@ -0,0 +1,9 @@
+import os
+from .default import DefaultModelConfig
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'AOTS'
+
+        self.MODEL_LSTT_NUM = 2

aot/configs/models/aott.py

@@ -0,0 +1,7 @@
+import os
+from .default import DefaultModelConfig
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'AOTT'

aot/configs/models/deaotb.py

@@ -0,0 +1,9 @@
+from .default_deaot import DefaultModelConfig
+
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'DeAOTB'
+
+        self.MODEL_LSTT_NUM = 3

aot/configs/models/deaotl.py

@@ -0,0 +1,13 @@
+from .default_deaot import DefaultModelConfig
+
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'DeAOTL'
+
+        self.MODEL_LSTT_NUM = 3
+
+        self.TRAIN_LONG_TERM_MEM_GAP = 2
+
+        self.TEST_LONG_TERM_MEM_GAP = 5

aot/configs/models/deaots.py

@@ -0,0 +1,9 @@
+from .default_deaot import DefaultModelConfig
+
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'DeAOTS'
+
+        self.MODEL_LSTT_NUM = 2

aot/configs/models/deaott.py

@@ -0,0 +1,7 @@
+from .default_deaot import DefaultModelConfig
+
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'DeAOTT'

aot/configs/models/default.py

@@ -0,0 +1,27 @@
+class DefaultModelConfig():
+    def __init__(self):
+        self.MODEL_NAME = 'AOTDefault'
+
+        self.MODEL_VOS = 'aot'
+        self.MODEL_ENGINE = 'aotengine'
+        self.MODEL_ALIGN_CORNERS = True
+        self.MODEL_ENCODER = 'mobilenetv2'
+        self.MODEL_ENCODER_PRETRAIN = './pretrain_models/mobilenet_v2-b0353104.pth'
+        self.MODEL_ENCODER_DIM = [24, 32, 96, 1280]  # 4x, 8x, 16x, 16x
+        self.MODEL_ENCODER_EMBEDDING_DIM = 256
+        self.MODEL_DECODER_INTERMEDIATE_LSTT = True
+        self.MODEL_FREEZE_BN = True
+        self.MODEL_FREEZE_BACKBONE = False
+        self.MODEL_MAX_OBJ_NUM = 10
+        self.MODEL_SELF_HEADS = 8
+        self.MODEL_ATT_HEADS = 8
+        self.MODEL_LSTT_NUM = 1
+        self.MODEL_EPSILON = 1e-5
+        self.MODEL_USE_PREV_PROB = False
+
+        self.TRAIN_LONG_TERM_MEM_GAP = 9999
+        self.TRAIN_AUG_TYPE = 'v1'
+
+        self.TEST_LONG_TERM_MEM_GAP = 9999
+
+        self.TEST_SHORT_TERM_MEM_SKIP = 1

aot/configs/models/default_deaot.py

@@ -0,0 +1,17 @@
+from .default import DefaultModelConfig as BaseConfig
+
+
+class DefaultModelConfig(BaseConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'DeAOTDefault'
+
+        self.MODEL_VOS = 'deaot'
+        self.MODEL_ENGINE = 'deaotengine'
+
+        self.MODEL_DECODER_INTERMEDIATE_LSTT = False
+
+        self.MODEL_SELF_HEADS = 1
+        self.MODEL_ATT_HEADS = 1
+
+        self.TRAIN_AUG_TYPE = 'v2'

aot/configs/models/r101_aotl.py

@@ -0,0 +1,16 @@
+from .default import DefaultModelConfig
+
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'R101_AOTL'
+
+        self.MODEL_ENCODER = 'resnet101'
+        self.MODEL_ENCODER_PRETRAIN = './pretrain_models/resnet101-63fe2227.pth'  # https://download.pytorch.org/models/resnet101-63fe2227.pth
+        self.MODEL_ENCODER_DIM = [256, 512, 1024, 1024]  # 4x, 8x, 16x, 16x
+        self.MODEL_LSTT_NUM = 3
+
+        self.TRAIN_LONG_TERM_MEM_GAP = 2
+
+        self.TEST_LONG_TERM_MEM_GAP = 5

aot/configs/models/r50_aotl.py

@@ -0,0 +1,16 @@
+from .default import DefaultModelConfig
+
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'R50_AOTL'
+
+        self.MODEL_ENCODER = 'resnet50'
+        self.MODEL_ENCODER_PRETRAIN = './pretrain_models/resnet50-0676ba61.pth'  # https://download.pytorch.org/models/resnet50-0676ba61.pth
+        self.MODEL_ENCODER_DIM = [256, 512, 1024, 1024]  # 4x, 8x, 16x, 16x
+        self.MODEL_LSTT_NUM = 3
+
+        self.TRAIN_LONG_TERM_MEM_GAP = 2
+
+        self.TEST_LONG_TERM_MEM_GAP = 5

aot/configs/models/r50_deaotl.py

@@ -0,0 +1,16 @@
+from .default_deaot import DefaultModelConfig
+
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'R50_DeAOTL'
+
+        self.MODEL_ENCODER = 'resnet50'
+        self.MODEL_ENCODER_DIM = [256, 512, 1024, 1024]  # 4x, 8x, 16x, 16x
+
+        self.MODEL_LSTT_NUM = 3
+
+        self.TRAIN_LONG_TERM_MEM_GAP = 2
+
+        self.TEST_LONG_TERM_MEM_GAP = 5

aot/configs/models/rs101_aotl.py

@@ -0,0 +1,16 @@
+from .default import DefaultModelConfig
+
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'R101_AOTL'
+
+        self.MODEL_ENCODER = 'resnest101'
+        self.MODEL_ENCODER_PRETRAIN = './pretrain_models/resnest101-22405ba7.pth'  # https://github.com/zhanghang1989/ResNeSt/releases/download/weights_step1/resnest101-22405ba7.pth
+        self.MODEL_ENCODER_DIM = [256, 512, 1024, 1024]  # 4x, 8x, 16x, 16x
+        self.MODEL_LSTT_NUM = 3
+
+        self.TRAIN_LONG_TERM_MEM_GAP = 2
+
+        self.TEST_LONG_TERM_MEM_GAP = 5

aot/configs/models/swinb_aotl.py

@@ -0,0 +1,17 @@
+from .default import DefaultModelConfig
+
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'SwinB_AOTL'
+
+        self.MODEL_ENCODER = 'swin_base'
+        self.MODEL_ENCODER_PRETRAIN = './pretrain_models/swin_base_patch4_window7_224_22k.pth'  # https://github.com/SwinTransformer/storage/releases/download/v1.0.0/swin_base_patch4_window7_224_22k.pth
+        self.MODEL_ALIGN_CORNERS = False
+        self.MODEL_ENCODER_DIM = [128, 256, 512, 512]  # 4x, 8x, 16x, 16x
+        self.MODEL_LSTT_NUM = 3
+
+        self.TRAIN_LONG_TERM_MEM_GAP = 2
+
+        self.TEST_LONG_TERM_MEM_GAP = 5

aot/configs/models/swinb_deaotl.py

@@ -0,0 +1,17 @@
+from .default_deaot import DefaultModelConfig
+
+
+class ModelConfig(DefaultModelConfig):
+    def __init__(self):
+        super().__init__()
+        self.MODEL_NAME = 'SwinB_DeAOTL'
+
+        self.MODEL_ENCODER = 'swin_base'
+        self.MODEL_ALIGN_CORNERS = False
+        self.MODEL_ENCODER_DIM = [128, 256, 512, 512]  # 4x, 8x, 16x, 16x
+
+        self.MODEL_LSTT_NUM = 3
+
+        self.TRAIN_LONG_TERM_MEM_GAP = 2
+
+        self.TEST_LONG_TERM_MEM_GAP = 5

aot/configs/pre.py

@@ -0,0 +1,19 @@
+from .default import DefaultEngineConfig
+
+
+class EngineConfig(DefaultEngineConfig):
+    def __init__(self, exp_name='default', model='AOTT'):
+        super().__init__(exp_name, model)
+        self.STAGE_NAME = 'PRE'
+
+        self.init_dir()
+
+        self.DATASETS = ['static']
+
+        self.DATA_DYNAMIC_MERGE_PROB = 1.0
+
+        self.TRAIN_LR = 4e-4
+        self.TRAIN_LR_MIN = 2e-5
+        self.TRAIN_WEIGHT_DECAY = 0.03
+        self.TRAIN_SEQ_TRAINING_START_RATIO = 1.0
+        self.TRAIN_AUX_LOSS_RATIO = 0.1

aot/configs/pre_dav.py

@@ -0,0 +1,21 @@
+import os
+from .default import DefaultEngineConfig
+
+
+class EngineConfig(DefaultEngineConfig):
+    def __init__(self, exp_name='default', model='AOTT'):
+        super().__init__(exp_name, model)
+        self.STAGE_NAME = 'PRE_DAV'
+
+        self.init_dir()
+
+        self.DATASETS = ['davis2017']
+
+        self.TRAIN_TOTAL_STEPS = 50000
+
+        pretrain_stage = 'PRE'
+        pretrain_ckpt = 'save_step_100000.pth'
+        self.PRETRAIN_FULL = True  # if False, load encoder only
+        self.PRETRAIN_MODEL = os.path.join(self.DIR_ROOT, 'result',
+                                           self.EXP_NAME, pretrain_stage,
+                                           'ema_ckpt', pretrain_ckpt)

aot/configs/pre_ytb.py

@@ -0,0 +1,17 @@
+import os
+from .default import DefaultEngineConfig
+
+
+class EngineConfig(DefaultEngineConfig):
+    def __init__(self, exp_name='default', model='AOTT'):
+        super().__init__(exp_name, model)
+        self.STAGE_NAME = 'PRE_YTB'
+
+        self.init_dir()
+
+        pretrain_stage = 'PRE'
+        pretrain_ckpt = 'save_step_100000.pth'
+        self.PRETRAIN_FULL = True  # if False, load encoder only
+        self.PRETRAIN_MODEL = os.path.join(self.DIR_ROOT, 'result',
+                                           self.EXP_NAME, pretrain_stage,
+                                           'ema_ckpt', pretrain_ckpt)

aot/configs/pre_ytb_dav.py

@@ -0,0 +1,19 @@
+import os
+from .default import DefaultEngineConfig
+
+
+class EngineConfig(DefaultEngineConfig):
+    def __init__(self, exp_name='default', model='AOTT'):
+        super().__init__(exp_name, model)
+        self.STAGE_NAME = 'PRE_YTB_DAV'
+
+        self.init_dir()
+
+        self.DATASETS = ['youtubevos', 'davis2017']
+
+        pretrain_stage = 'PRE'
+        pretrain_ckpt = 'save_step_100000.pth'
+        self.PRETRAIN_FULL = True  # if False, load encoder only
+        self.PRETRAIN_MODEL = os.path.join(self.DIR_ROOT, 'result',
+                                           self.EXP_NAME, pretrain_stage,
+                                           'ema_ckpt', pretrain_ckpt)

aot/configs/ytb.py

@@ -0,0 +1,10 @@
+import os
+from .default import DefaultEngineConfig
+
+
+class EngineConfig(DefaultEngineConfig):
+    def __init__(self, exp_name='default', model='AOTT'):
+        super().__init__(exp_name, model)
+        self.STAGE_NAME = 'YTB'
+
+        self.init_dir()

aot/dataloaders/eval_datasets.py

@@ -0,0 +1,411 @@
+from __future__ import division
+import os
+import shutil
+import json
+import cv2
+from PIL import Image
+
+import numpy as np
+from torch.utils.data import Dataset
+
+from utils.image import _palette
+
+
+class VOSTest(Dataset):
+    def __init__(self,
+                 image_root,
+                 label_root,
+                 seq_name,
+                 images,
+                 labels,
+                 rgb=True,
+                 transform=None,
+                 single_obj=False,
+                 resolution=None):
+        self.image_root = image_root
+        self.label_root = label_root
+        self.seq_name = seq_name
+        self.images = images
+        self.labels = labels
+        self.obj_num = 1
+        self.num_frame = len(self.images)
+        self.transform = transform
+        self.rgb = rgb
+        self.single_obj = single_obj
+        self.resolution = resolution
+
+        self.obj_nums = []
+        self.obj_indices = []
+
+        curr_objs = [0]
+        for img_name in self.images:
+            self.obj_nums.append(len(curr_objs) - 1)
+            current_label_name = img_name.split('.')[0] + '.png'
+            if current_label_name in self.labels:
+                current_label = self.read_label(current_label_name)
+                curr_obj = list(np.unique(current_label))
+                for obj_idx in curr_obj:
+                    if obj_idx not in curr_objs:
+                        curr_objs.append(obj_idx)
+            self.obj_indices.append(curr_objs.copy())
+
+        self.obj_nums[0] = self.obj_nums[1]
+
+    def __len__(self):
+        return len(self.images)
+
+    def read_image(self, idx):
+        img_name = self.images[idx]
+        img_path = os.path.join(self.image_root, self.seq_name, img_name)
+        img = cv2.imread(img_path)
+        img = np.array(img, dtype=np.float32)
+        if self.rgb:
+            img = img[:, :, [2, 1, 0]]
+        return img
+
+    def read_label(self, label_name, squeeze_idx=None):
+        label_path = os.path.join(self.label_root, self.seq_name, label_name)
+        label = Image.open(label_path)
+        label = np.array(label, dtype=np.uint8)
+        if self.single_obj:
+            label = (label > 0).astype(np.uint8)
+        elif squeeze_idx is not None:
+            squeezed_label = label * 0
+            for idx in range(len(squeeze_idx)):
+                obj_id = squeeze_idx[idx]
+                if obj_id == 0:
+                    continue
+                mask = label == obj_id
+                squeezed_label += (mask * idx).astype(np.uint8)
+            label = squeezed_label
+        return label
+
+    def __getitem__(self, idx):
+        img_name = self.images[idx]
+        current_img = self.read_image(idx)
+        height, width, channels = current_img.shape
+        if self.resolution is not None:
+            width = int(np.ceil(
+                float(width) * self.resolution / float(height)))
+            height = int(self.resolution)
+
+        current_label_name = img_name.split('.')[0] + '.png'
+        obj_num = self.obj_nums[idx]
+        obj_idx = self.obj_indices[idx]
+
+        if current_label_name in self.labels:
+            current_label = self.read_label(current_label_name, obj_idx)
+            sample = {
+                'current_img': current_img,
+                'current_label': current_label
+            }
+        else:
+            sample = {'current_img': current_img}
+
+        sample['meta'] = {
+            'seq_name': self.seq_name,
+            'frame_num': self.num_frame,
+            'obj_num': obj_num,
+            'current_name': img_name,
+            'height': height,
+            'width': width,
+            'flip': False,
+            'obj_idx': obj_idx
+        }
+
+        if self.transform is not None:
+            sample = self.transform(sample)
+        return sample
+
+
+class YOUTUBEVOS_Test(object):
+    def __init__(self,
+                 root='./datasets/YTB',
+                 year=2018,
+                 split='val',
+                 transform=None,
+                 rgb=True,
+                 result_root=None):
+        if split == 'val':
+            split = 'valid'
+        root = os.path.join(root, str(year), split)
+        self.db_root_dir = root
+        self.result_root = result_root
+        self.rgb = rgb
+        self.transform = transform
+        self.seq_list_file = os.path.join(self.db_root_dir, 'meta.json')
+        self._check_preprocess()
+        self.seqs = list(self.ann_f.keys())
+        self.image_root = os.path.join(root, 'JPEGImages')
+        self.label_root = os.path.join(root, 'Annotations')
+
+    def __len__(self):
+        return len(self.seqs)
+
+    def __getitem__(self, idx):
+        seq_name = self.seqs[idx]
+        data = self.ann_f[seq_name]['objects']
+        obj_names = list(data.keys())
+        images = []
+        labels = []
+        for obj_n in obj_names:
+            images += map(lambda x: x + '.jpg', list(data[obj_n]["frames"]))
+            labels.append(data[obj_n]["frames"][0] + '.png')
+        images = np.sort(np.unique(images))
+        labels = np.sort(np.unique(labels))
+
+        try:
+            if not os.path.isfile(
+                    os.path.join(self.result_root, seq_name, labels[0])):
+                if not os.path.exists(os.path.join(self.result_root,
+                                                   seq_name)):
+                    os.makedirs(os.path.join(self.result_root, seq_name))
+                shutil.copy(
+                    os.path.join(self.label_root, seq_name, labels[0]),
+                    os.path.join(self.result_root, seq_name, labels[0]))
+        except Exception as inst:
+            print(inst)
+            print('Failed to create a result folder for sequence {}.'.format(
+                seq_name))
+
+        seq_dataset = VOSTest(self.image_root,
+                              self.label_root,
+                              seq_name,
+                              images,
+                              labels,
+                              transform=self.transform,
+                              rgb=self.rgb)
+        return seq_dataset
+
+    def _check_preprocess(self):
+        _seq_list_file = self.seq_list_file
+        if not os.path.isfile(_seq_list_file):
+            print(_seq_list_file)
+            return False
+        else:
+            self.ann_f = json.load(open(self.seq_list_file, 'r'))['videos']
+            return True
+
+
+class YOUTUBEVOS_DenseTest(object):
+    def __init__(self,
+                 root='./datasets/YTB',
+                 year=2018,
+                 split='val',
+                 transform=None,
+                 rgb=True,
+                 result_root=None):
+        if split == 'val':
+            split = 'valid'
+        root_sparse = os.path.join(root, str(year), split)
+        root_dense = root_sparse + '_all_frames'
+        self.db_root_dir = root_dense
+        self.result_root = result_root
+        self.rgb = rgb
+        self.transform = transform
+        self.seq_list_file = os.path.join(root_sparse, 'meta.json')
+        self._check_preprocess()
+        self.seqs = list(self.ann_f.keys())
+        self.image_root = os.path.join(root_dense, 'JPEGImages')
+        self.label_root = os.path.join(root_sparse, 'Annotations')
+
+    def __len__(self):
+        return len(self.seqs)
+
+    def __getitem__(self, idx):
+        seq_name = self.seqs[idx]
+
+        data = self.ann_f[seq_name]['objects']
+        obj_names = list(data.keys())
+        images_sparse = []
+        for obj_n in obj_names:
+            images_sparse += map(lambda x: x + '.jpg',
+                                 list(data[obj_n]["frames"]))
+        images_sparse = np.sort(np.unique(images_sparse))
+
+        images = np.sort(
+            list(os.listdir(os.path.join(self.image_root, seq_name))))
+        start_img = images_sparse[0]
+        end_img = images_sparse[-1]
+        for start_idx in range(len(images)):
+            if start_img in images[start_idx]:
+                break
+        for end_idx in range(len(images))[::-1]:
+            if end_img in images[end_idx]:
+                break
+        images = images[start_idx:(end_idx + 1)]
+        labels = np.sort(
+            list(os.listdir(os.path.join(self.label_root, seq_name))))
+
+        try:
+            if not os.path.isfile(
+                    os.path.join(self.result_root, seq_name, labels[0])):
+                if not os.path.exists(os.path.join(self.result_root,
+                                                   seq_name)):
+                    os.makedirs(os.path.join(self.result_root, seq_name))
+                shutil.copy(
+                    os.path.join(self.label_root, seq_name, labels[0]),
+                    os.path.join(self.result_root, seq_name, labels[0]))
+        except Exception as inst:
+            print(inst)
+            print('Failed to create a result folder for sequence {}.'.format(
+                seq_name))
+
+        seq_dataset = VOSTest(self.image_root,
+                              self.label_root,
+                              seq_name,
+                              images,
+                              labels,
+                              transform=self.transform,
+                              rgb=self.rgb)
+        seq_dataset.images_sparse = images_sparse
+
+        return seq_dataset
+
+    def _check_preprocess(self):
+        _seq_list_file = self.seq_list_file
+        if not os.path.isfile(_seq_list_file):
+            print(_seq_list_file)
+            return False
+        else:
+            self.ann_f = json.load(open(self.seq_list_file, 'r'))['videos']
+            return True
+
+
+class DAVIS_Test(object):
+    def __init__(self,
+                 split=['val'],
+                 root='./DAVIS',
+                 year=2017,
+                 transform=None,
+                 rgb=True,
+                 full_resolution=False,
+                 result_root=None):
+        self.transform = transform
+        self.rgb = rgb
+        self.result_root = result_root
+        if year == 2016:
+            self.single_obj = True
+        else:
+            self.single_obj = False
+        if full_resolution:
+            resolution = 'Full-Resolution'
+        else:
+            resolution = '480p'
+        self.image_root = os.path.join(root, 'JPEGImages', resolution)
+        self.label_root = os.path.join(root, 'Annotations', resolution)
+        seq_names = []
+        for spt in split:
+            if spt == 'test':
+                spt = 'test-dev'
+            with open(os.path.join(root, 'ImageSets', str(year),
+                                   spt + '.txt')) as f:
+                seqs_tmp = f.readlines()
+            seqs_tmp = list(map(lambda elem: elem.strip(), seqs_tmp))
+            seq_names.extend(seqs_tmp)
+        self.seqs = list(np.unique(seq_names))
+
+    def __len__(self):
+        return len(self.seqs)
+
+    def __getitem__(self, idx):
+        seq_name = self.seqs[idx]
+        images = list(
+            np.sort(os.listdir(os.path.join(self.image_root, seq_name))))
+        labels = [images[0].replace('jpg', 'png')]
+
+        if not os.path.isfile(
+                os.path.join(self.result_root, seq_name, labels[0])):
+            seq_result_folder = os.path.join(self.result_root, seq_name)
+            try:
+                if not os.path.exists(seq_result_folder):
+                    os.makedirs(seq_result_folder)
+            except Exception as inst:
+                print(inst)
+                print(
+                    'Failed to create a result folder for sequence {}.'.format(
+                        seq_name))
+            source_label_path = os.path.join(self.label_root, seq_name,
+                                             labels[0])
+            result_label_path = os.path.join(self.result_root, seq_name,
+                                             labels[0])
+            if self.single_obj:
+                label = Image.open(source_label_path)
+                label = np.array(label, dtype=np.uint8)
+                label = (label > 0).astype(np.uint8)
+                label = Image.fromarray(label).convert('P')
+                label.putpalette(_palette)
+                label.save(result_label_path)
+            else:
+                shutil.copy(source_label_path, result_label_path)
+
+        seq_dataset = VOSTest(self.image_root,
+                              self.label_root,
+                              seq_name,
+                              images,
+                              labels,
+                              transform=self.transform,
+                              rgb=self.rgb,
+                              single_obj=self.single_obj,
+                              resolution=480)
+        return seq_dataset
+
+
+class _EVAL_TEST(Dataset):
+    def __init__(self, transform, seq_name):
+        self.seq_name = seq_name
+        self.num_frame = 10
+        self.transform = transform
+
+    def __len__(self):
+        return self.num_frame
+
+    def __getitem__(self, idx):
+        current_frame_obj_num = 2
+        height = 400
+        width = 400
+        img_name = 'test{}.jpg'.format(idx)
+        current_img = np.zeros((height, width, 3)).astype(np.float32)
+        if idx == 0:
+            current_label = (current_frame_obj_num * np.ones(
+                (height, width))).astype(np.uint8)
+            sample = {
+                'current_img': current_img,
+                'current_label': current_label
+            }
+        else:
+            sample = {'current_img': current_img}
+
+        sample['meta'] = {
+            'seq_name': self.seq_name,
+            'frame_num': self.num_frame,
+            'obj_num': current_frame_obj_num,
+            'current_name': img_name,
+            'height': height,
+            'width': width,
+            'flip': False
+        }
+
+        if self.transform is not None:
+            sample = self.transform(sample)
+        return sample
+
+
+class EVAL_TEST(object):
+    def __init__(self, transform=None, result_root=None):
+        self.transform = transform
+        self.result_root = result_root
+
+        self.seqs = ['test1', 'test2', 'test3']
+
+    def __len__(self):
+        return len(self.seqs)
+
+    def __getitem__(self, idx):
+        seq_name = self.seqs[idx]
+
+        if not os.path.exists(os.path.join(self.result_root, seq_name)):
+            os.makedirs(os.path.join(self.result_root, seq_name))
+
+        seq_dataset = _EVAL_TEST(self.transform, seq_name)
+        return seq_dataset

aot/dataloaders/image_transforms.py

@@ -0,0 +1,530 @@
+import math
+import warnings
+import random
+import numbers
+import numpy as np
+from PIL import Image, ImageFilter
+from collections.abc import Sequence
+
+import torch
+import torchvision.transforms.functional as TF
+
+_pil_interpolation_to_str = {
+    Image.NEAREST: 'PIL.Image.NEAREST',
+    Image.BILINEAR: 'PIL.Image.BILINEAR',
+    Image.BICUBIC: 'PIL.Image.BICUBIC',
+    Image.LANCZOS: 'PIL.Image.LANCZOS',
+    Image.HAMMING: 'PIL.Image.HAMMING',
+    Image.BOX: 'PIL.Image.BOX',
+}
+
+
+def _get_image_size(img):
+    if TF._is_pil_image(img):
+        return img.size
+    elif isinstance(img, torch.Tensor) and img.dim() > 2:
+        return img.shape[-2:][::-1]
+    else:
+        raise TypeError("Unexpected type {}".format(type(img)))
+
+
+class RandomHorizontalFlip(object):
+    """Horizontal flip the given PIL Image randomly with a given probability.
+
+    Args:
+        p (float): probability of the image being flipped. Default value is 0.5
+    """
+    def __init__(self, p=0.5):
+        self.p = p
+
+    def __call__(self, img, mask):
+        """
+        Args:
+            img (PIL Image): Image to be flipped.
+
+        Returns:
+            PIL Image: Randomly flipped image.
+        """
+        if random.random() < self.p:
+            img = TF.hflip(img)
+            mask = TF.hflip(mask)
+        return img, mask
+
+    def __repr__(self):
+        return self.__class__.__name__ + '(p={})'.format(self.p)
+
+
+class RandomVerticalFlip(object):
+    """Vertical flip the given PIL Image randomly with a given probability.
+
+    Args:
+        p (float): probability of the image being flipped. Default value is 0.5
+    """
+    def __init__(self, p=0.5):
+        self.p = p
+
+    def __call__(self, img, mask):
+        """
+        Args:
+            img (PIL Image): Image to be flipped.
+
+        Returns:
+            PIL Image: Randomly flipped image.
+        """
+        if random.random() < self.p:
+            img = TF.vflip(img)
+            mask = TF.vflip(mask)
+        return img, mask
+
+    def __repr__(self):
+        return self.__class__.__name__ + '(p={})'.format(self.p)
+
+
+class GaussianBlur(object):
+    """Gaussian blur augmentation from SimCLR: https://arxiv.org/abs/2002.05709"""
+    def __init__(self, sigma=[.1, 2.]):
+        self.sigma = sigma
+
+    def __call__(self, x):
+        sigma = random.uniform(self.sigma[0], self.sigma[1])
+        x = x.filter(ImageFilter.GaussianBlur(radius=sigma))
+        return x
+
+
+class RandomAffine(object):
+    """Random affine transformation of the image keeping center invariant
+
+    Args:
+        degrees (sequence or float or int): Range of degrees to select from.
+            If degrees is a number instead of sequence like (min, max), the range of degrees
+            will be (-degrees, +degrees). Set to 0 to deactivate rotations.
+        translate (tuple, optional): tuple of maximum absolute fraction for horizontal
+            and vertical translations. For example translate=(a, b), then horizontal shift
+            is randomly sampled in the range -img_width * a < dx < img_width * a and vertical shift is
+            randomly sampled in the range -img_height * b < dy < img_height * b. Will not translate by default.
+        scale (tuple, optional): scaling factor interval, e.g (a, b), then scale is
+            randomly sampled from the range a <= scale <= b. Will keep original scale by default.
+        shear (sequence or float or int, optional): Range of degrees to select from.
+            If shear is a number, a shear parallel to the x axis in the range (-shear, +shear)
+            will be apllied. Else if shear is a tuple or list of 2 values a shear parallel to the x axis in the
+            range (shear[0], shear[1]) will be applied. Else if shear is a tuple or list of 4 values,
+            a x-axis shear in (shear[0], shear[1]) and y-axis shear in (shear[2], shear[3]) will be applied.
+            Will not apply shear by default
+        resample ({PIL.Image.NEAREST, PIL.Image.BILINEAR, PIL.Image.BICUBIC}, optional):
+            An optional resampling filter. See `filters`_ for more information.
+            If omitted, or if the image has mode "1" or "P", it is set to PIL.Image.NEAREST.
+        fillcolor (tuple or int): Optional fill color (Tuple for RGB Image And int for grayscale) for the area
+            outside the transform in the output image.(Pillow>=5.0.0)
+
+    .. _filters: https://pillow.readthedocs.io/en/latest/handbook/concepts.html#filters
+
+    """
+    def __init__(self,
+                 degrees,
+                 translate=None,
+                 scale=None,
+                 shear=None,
+                 resample=False,
+                 fillcolor=0):
+        if isinstance(degrees, numbers.Number):
+            if degrees < 0:
+                raise ValueError(
+                    "If degrees is a single number, it must be positive.")
+            self.degrees = (-degrees, degrees)
+        else:
+            assert isinstance(degrees, (tuple, list)) and len(degrees) == 2, \
+                "degrees should be a list or tuple and it must be of length 2."
+            self.degrees = degrees
+
+        if translate is not None:
+            assert isinstance(translate, (tuple, list)) and len(translate) == 2, \
+                "translate should be a list or tuple and it must be of length 2."
+            for t in translate:
+                if not (0.0 <= t <= 1.0):
+                    raise ValueError(
+                        "translation values should be between 0 and 1")
+        self.translate = translate
+
+        if scale is not None:
+            assert isinstance(scale, (tuple, list)) and len(scale) == 2, \
+                "scale should be a list or tuple and it must be of length 2."
+            for s in scale:
+                if s <= 0:
+                    raise ValueError("scale values should be positive")
+        self.scale = scale
+
+        if shear is not None:
+            if isinstance(shear, numbers.Number):
+                if shear < 0:
+                    raise ValueError(
+                        "If shear is a single number, it must be positive.")
+                self.shear = (-shear, shear)
+            else:
+                assert isinstance(shear, (tuple, list)) and \
+                       (len(shear) == 2 or len(shear) == 4), \
+                       "shear should be a list or tuple and it must be of length 2 or 4."
+                # X-Axis shear with [min, max]
+                if len(shear) == 2:
+                    self.shear = [shear[0], shear[1], 0., 0.]
+                elif len(shear) == 4:
+                    self.shear = [s for s in shear]
+        else:
+            self.shear = shear
+
+        self.resample = resample
+        self.fillcolor = fillcolor
+
+    @staticmethod
+    def get_params(degrees, translate, scale_ranges, shears, img_size):
+        """Get parameters for affine transformation
+
+        Returns:
+            sequence: params to be passed to the affine transformation
+        """
+        angle = random.uniform(degrees[0], degrees[1])
+        if translate is not None:
+            max_dx = translate[0] * img_size[0]
+            max_dy = translate[1] * img_size[1]
+            translations = (np.round(random.uniform(-max_dx, max_dx)),
+                            np.round(random.uniform(-max_dy, max_dy)))
+        else:
+            translations = (0, 0)
+
+        if scale_ranges is not None:
+            scale = random.uniform(scale_ranges[0], scale_ranges[1])
+        else:
+            scale = 1.0
+
+        if shears is not None:
+            if len(shears) == 2:
+                shear = [random.uniform(shears[0], shears[1]), 0.]
+            elif len(shears) == 4:
+                shear = [
+                    random.uniform(shears[0], shears[1]),
+                    random.uniform(shears[2], shears[3])
+                ]
+        else:
+            shear = 0.0
+
+        return angle, translations, scale, shear
+
+    def __call__(self, img, mask):
+        """
+            img (PIL Image): Image to be transformed.
+
+        Returns:
+            PIL Image: Affine transformed image.
+        """
+        ret = self.get_params(self.degrees, self.translate, self.scale,
+                              self.shear, img.size)
+        img = TF.affine(img,
+                        *ret,
+                        resample=self.resample,
+                        fillcolor=self.fillcolor)
+        mask = TF.affine(mask, *ret, resample=Image.NEAREST, fillcolor=0)
+        return img, mask
+
+    def __repr__(self):
+        s = '{name}(degrees={degrees}'
+        if self.translate is not None:
+            s += ', translate={translate}'
+        if self.scale is not None:
+            s += ', scale={scale}'
+        if self.shear is not None:
+            s += ', shear={shear}'
+        if self.resample > 0:
+            s += ', resample={resample}'
+        if self.fillcolor != 0:
+            s += ', fillcolor={fillcolor}'
+        s += ')'
+        d = dict(self.__dict__)
+        d['resample'] = _pil_interpolation_to_str[d['resample']]
+        return s.format(name=self.__class__.__name__, **d)
+
+
+class RandomCrop(object):
+    """Crop the given PIL Image at a random location.
+
+    Args:
+        size (sequence or int): Desired output size of the crop. If size is an
+            int instead of sequence like (h, w), a square crop (size, size) is
+            made.
+        padding (int or sequence, optional): Optional padding on each border
+            of the image. Default is None, i.e no padding. If a sequence of length
+            4 is provided, it is used to pad left, top, right, bottom borders
+            respectively. If a sequence of length 2 is provided, it is used to
+            pad left/right, top/bottom borders, respectively.
+        pad_if_needed (boolean): It will pad the image if smaller than the
+            desired size to avoid raising an exception. Since cropping is done
+            after padding, the padding seems to be done at a random offset.
+        fill: Pixel fill value for constant fill. Default is 0. If a tuple of
+            length 3, it is used to fill R, G, B channels respectively.
+            This value is only used when the padding_mode is constant
+        padding_mode: Type of padding. Should be: constant, edge, reflect or symmetric. Default is constant.
+
+             - constant: pads with a constant value, this value is specified with fill
+
+             - edge: pads with the last value on the edge of the image
+
+             - reflect: pads with reflection of image (without repeating the last value on the edge)
+
+                padding [1, 2, 3, 4] with 2 elements on both sides in reflect mode
+                will result in [3, 2, 1, 2, 3, 4, 3, 2]
+
+             - symmetric: pads with reflection of image (repeating the last value on the edge)
+
+                padding [1, 2, 3, 4] with 2 elements on both sides in symmetric mode
+                will result in [2, 1, 1, 2, 3, 4, 4, 3]
+
+    """
+    def __init__(self,
+                 size,
+                 padding=None,
+                 pad_if_needed=False,
+                 fill=0,
+                 padding_mode='constant'):
+        if isinstance(size, numbers.Number):
+            self.size = (int(size), int(size))
+        else:
+            self.size = size
+        self.padding = padding
+        self.pad_if_needed = pad_if_needed
+        self.fill = fill
+        self.padding_mode = padding_mode
+
+    @staticmethod
+    def get_params(img, output_size):
+        """Get parameters for ``crop`` for a random crop.
+
+        Args:
+            img (PIL Image): Image to be cropped.
+            output_size (tuple): Expected output size of the crop.
+
+        Returns:
+            tuple: params (i, j, h, w) to be passed to ``crop`` for random crop.
+        """
+        w, h = _get_image_size(img)
+        th, tw = output_size
+        if w == tw and h == th:
+            return 0, 0, h, w
+
+        i = random.randint(0, h - th)
+        j = random.randint(0, w - tw)
+        return i, j, th, tw
+
+    def __call__(self, img, mask):
+        """
+        Args:
+            img (PIL Image): Image to be cropped.
+
+        Returns:
+            PIL Image: Cropped image.
+        """
+        # if self.padding is not None:
+        #     img = TF.pad(img, self.padding, self.fill, self.padding_mode)
+        #
+        # # pad the width if needed
+        # if self.pad_if_needed and img.size[0] < self.size[1]:
+        #     img = TF.pad(img, (self.size[1] - img.size[0], 0), self.fill, self.padding_mode)
+        # # pad the height if needed
+        # if self.pad_if_needed and img.size[1] < self.size[0]:
+        #     img = TF.pad(img, (0, self.size[0] - img.size[1]), self.fill, self.padding_mode)
+
+        i, j, h, w = self.get_params(img, self.size)
+        img = TF.crop(img, i, j, h, w)
+        mask = TF.crop(mask, i, j, h, w)
+
+        return img, mask
+
+    def __repr__(self):
+        return self.__class__.__name__ + '(size={0}, padding={1})'.format(
+            self.size, self.padding)
+
+
+class RandomResizedCrop(object):
+    """Crop the given PIL Image to random size and aspect ratio.
+
+    A crop of random size (default: of 0.08 to 1.0) of the original size and a random
+    aspect ratio (default: of 3/4 to 4/3) of the original aspect ratio is made. This crop
+    is finally resized to given size.
+    This is popularly used to train the Inception networks.
+
+    Args:
+        size: expected output size of each edge
+        scale: range of size of the origin size cropped
+        ratio: range of aspect ratio of the origin aspect ratio cropped
+        interpolation: Default: PIL.Image.BILINEAR
+    """
+    def __init__(self,
+                 size,
+                 scale=(0.08, 1.0),
+                 ratio=(3. / 4., 4. / 3.),
+                 interpolation=Image.BILINEAR):
+        if isinstance(size, (tuple, list)):
+            self.size = size
+        else:
+            self.size = (size, size)
+        if (scale[0] > scale[1]) or (ratio[0] > ratio[1]):
+            warnings.warn("range should be of kind (min, max)")
+
+        self.interpolation = interpolation
+        self.scale = scale
+        self.ratio = ratio
+
+    @staticmethod
+    def get_params(img, scale, ratio):
+        """Get parameters for ``crop`` for a random sized crop.
+
+        Args:
+            img (PIL Image): Image to be cropped.
+            scale (tuple): range of size of the origin size cropped
+            ratio (tuple): range of aspect ratio of the origin aspect ratio cropped
+
+        Returns:
+            tuple: params (i, j, h, w) to be passed to ``crop`` for a random
+                sized crop.
+        """
+        width, height = _get_image_size(img)
+        area = height * width
+
+        for _ in range(10):
+            target_area = random.uniform(*scale) * area
+            log_ratio = (math.log(ratio[0]), math.log(ratio[1]))
+            aspect_ratio = math.exp(random.uniform(*log_ratio))
+
+            w = int(round(math.sqrt(target_area * aspect_ratio)))
+            h = int(round(math.sqrt(target_area / aspect_ratio)))
+
+            if 0 < w <= width and 0 < h <= height:
+                i = random.randint(0, height - h)
+                j = random.randint(0, width - w)
+                return i, j, h, w
+
+        # Fallback to central crop
+        in_ratio = float(width) / float(height)
+        if (in_ratio < min(ratio)):
+            w = width
+            h = int(round(w / min(ratio)))
+        elif (in_ratio > max(ratio)):
+            h = height
+            w = int(round(h * max(ratio)))
+        else:  # whole image
+            w = width
+            h = height
+        i = (height - h) // 2
+        j = (width - w) // 2
+        return i, j, h, w
+
+    def __call__(self, img, mask):
+        """
+        Args:
+            img (PIL Image): Image to be cropped and resized.
+
+        Returns:
+            PIL Image: Randomly cropped and resized image.
+        """
+        i, j, h, w = self.get_params(img, self.scale, self.ratio)
+        # print(i, j, h, w)
+        img = TF.resized_crop(img, i, j, h, w, self.size, self.interpolation)
+        mask = TF.resized_crop(mask, i, j, h, w, self.size, Image.NEAREST)
+        return img, mask
+
+    def __repr__(self):
+        interpolate_str = _pil_interpolation_to_str[self.interpolation]
+        format_string = self.__class__.__name__ + '(size={0}'.format(self.size)
+        format_string += ', scale={0}'.format(
+            tuple(round(s, 4) for s in self.scale))
+        format_string += ', ratio={0}'.format(
+            tuple(round(r, 4) for r in self.ratio))
+        format_string += ', interpolation={0})'.format(interpolate_str)
+        return format_string
+
+
+class ToOnehot(object):
+    """To oneshot tensor
+
+    Args:
+        max_obj_n (float): Maximum number of the objects
+    """
+    def __init__(self, max_obj_n, shuffle):
+        self.max_obj_n = max_obj_n
+        self.shuffle = shuffle
+
+    def __call__(self, mask, obj_list=None):
+        """
+        Args:
+            mask (Mask in Numpy): Mask to be converted.
+
+        Returns:
+            Tensor: Converted mask in onehot format.
+        """
+
+        new_mask = np.zeros((self.max_obj_n + 1, *mask.shape), np.uint8)
+
+        if not obj_list:
+            obj_list = list()
+            obj_max = mask.max() + 1
+            for i in range(1, obj_max):
+                tmp = (mask == i).astype(np.uint8)
+                if tmp.max() > 0:
+                    obj_list.append(i)
+
+            if self.shuffle:
+                random.shuffle(obj_list)
+            obj_list = obj_list[:self.max_obj_n]
+
+        for i in range(len(obj_list)):
+            new_mask[i + 1] = (mask == obj_list[i]).astype(np.uint8)
+        new_mask[0] = 1 - np.sum(new_mask, axis=0)
+
+        return torch.from_numpy(new_mask), obj_list
+
+    def __repr__(self):
+        return self.__class__.__name__ + '(max_obj_n={})'.format(
+            self.max_obj_n)
+
+
+class Resize(torch.nn.Module):
+    """Resize the input image to the given size.
+    The image can be a PIL Image or a torch Tensor, in which case it is expected
+    to have [..., H, W] shape, where ... means an arbitrary number of leading dimensions
+
+    Args:
+        size (sequence or int): Desired output size. If size is a sequence like
+            (h, w), output size will be matched to this. If size is an int,
+            smaller edge of the image will be matched to this number.
+            i.e, if height > width, then image will be rescaled to
+            (size * height / width, size).
+            In torchscript mode padding as single int is not supported, use a tuple or
+            list of length 1: ``[size, ]``.
+        interpolation (int, optional): Desired interpolation enum defined by `filters`_.
+            Default is ``PIL.Image.BILINEAR``. If input is Tensor, only ``PIL.Image.NEAREST``, ``PIL.Image.BILINEAR``
+            and ``PIL.Image.BICUBIC`` are supported.
+    """
+    def __init__(self, size, interpolation=Image.BILINEAR):
+        super().__init__()
+        if not isinstance(size, (int, Sequence)):
+            raise TypeError("Size should be int or sequence. Got {}".format(
+                type(size)))
+        if isinstance(size, Sequence) and len(size) not in (1, 2):
+            raise ValueError(
+                "If size is a sequence, it should have 1 or 2 values")
+        self.size = size
+        self.interpolation = interpolation
+
+    def forward(self, img, mask):
+        """
+        Args:
+            img (PIL Image or Tensor): Image to be scaled.
+
+        Returns:
+            PIL Image or Tensor: Rescaled image.
+        """
+        img = TF.resize(img, self.size, self.interpolation)
+        mask = TF.resize(mask, self.size, Image.NEAREST)
+        return img, mask
+
+    def __repr__(self):
+        interpolate_str = _pil_interpolation_to_str[self.interpolation]
+        return self.__class__.__name__ + '(size={0}, interpolation={1})'.format(
+            self.size, interpolate_str)

aot/dataloaders/train_datasets.py

@@ -0,0 +1,682 @@
+from __future__ import division
+import os
+from glob import glob
+import json
+import random
+import cv2
+from PIL import Image
+
+import numpy as np
+import torch
+from torch.utils.data import Dataset
+import torchvision.transforms as TF
+
+import dataloaders.image_transforms as IT
+
+cv2.setNumThreads(0)
+
+
+def _get_images(sample):
+    return [sample['ref_img'], sample['prev_img']] + sample['curr_img']
+
+
+def _get_labels(sample):
+    return [sample['ref_label'], sample['prev_label']] + sample['curr_label']
+
+
+def _merge_sample(sample1, sample2, min_obj_pixels=100, max_obj_n=10):
+
+    sample1_images = _get_images(sample1)
+    sample2_images = _get_images(sample2)
+
+    sample1_labels = _get_labels(sample1)
+    sample2_labels = _get_labels(sample2)
+
+    obj_idx = torch.arange(0, max_obj_n * 2 + 1).view(max_obj_n * 2 + 1, 1, 1)
+    selected_idx = None
+    selected_obj = None
+
+    all_img = []
+    all_mask = []
+    for idx, (s1_img, s2_img, s1_label, s2_label) in enumerate(
+            zip(sample1_images, sample2_images, sample1_labels,
+                sample2_labels)):
+        s2_fg = (s2_label > 0).float()
+        s2_bg = 1 - s2_fg
+        merged_img = s1_img * s2_bg + s2_img * s2_fg
+        merged_mask = s1_label * s2_bg.long() + (
+            (s2_label + max_obj_n) * s2_fg.long())
+        merged_mask = (merged_mask == obj_idx).float()
+        if idx == 0:
+            after_merge_pixels = merged_mask.sum(dim=(1, 2), keepdim=True)
+            selected_idx = after_merge_pixels > min_obj_pixels
+            selected_idx[0] = True
+            obj_num = selected_idx.sum().int().item() - 1
+            selected_idx = selected_idx.expand(-1,
+                                               s1_label.size()[1],
+                                               s1_label.size()[2])
+            if obj_num > max_obj_n:
+                selected_obj = list(range(1, obj_num + 1))
+                random.shuffle(selected_obj)
+                selected_obj = [0] + selected_obj[:max_obj_n]
+
+        merged_mask = merged_mask[selected_idx].view(obj_num + 1,
+                                                     s1_label.size()[1],
+                                                     s1_label.size()[2])
+        if obj_num > max_obj_n:
+            merged_mask = merged_mask[selected_obj]
+        merged_mask[0] += 0.1
+        merged_mask = torch.argmax(merged_mask, dim=0, keepdim=True).long()
+
+        all_img.append(merged_img)
+        all_mask.append(merged_mask)
+
+    sample = {
+        'ref_img': all_img[0],
+        'prev_img': all_img[1],
+        'curr_img': all_img[2:],
+        'ref_label': all_mask[0],
+        'prev_label': all_mask[1],
+        'curr_label': all_mask[2:]
+    }
+    sample['meta'] = sample1['meta']
+    sample['meta']['obj_num'] = min(obj_num, max_obj_n)
+    return sample
+
+
+class StaticTrain(Dataset):
+    def __init__(self,
+                 root,
+                 output_size,
+                 seq_len=5,
+                 max_obj_n=10,
+                 dynamic_merge=True,
+                 merge_prob=1.0,
+                 aug_type='v1'):
+        self.root = root
+        self.clip_n = seq_len
+        self.output_size = output_size
+        self.max_obj_n = max_obj_n
+
+        self.dynamic_merge = dynamic_merge
+        self.merge_prob = merge_prob
+
+        self.img_list = list()
+        self.mask_list = list()
+
+        dataset_list = list()
+        lines = ['COCO', 'ECSSD', 'MSRA10K', 'PASCAL-S', 'PASCALVOC2012']
+        for line in lines:
+            dataset_name = line.strip()
+
+            img_dir = os.path.join(root, 'JPEGImages', dataset_name)
+            mask_dir = os.path.join(root, 'Annotations', dataset_name)
+
+            img_list = sorted(glob(os.path.join(img_dir, '*.jpg'))) + \
+                sorted(glob(os.path.join(img_dir, '*.png')))
+            mask_list = sorted(glob(os.path.join(mask_dir, '*.png')))
+
+            if len(img_list) > 0:
+                if len(img_list) == len(mask_list):
+                    dataset_list.append(dataset_name)
+                    self.img_list += img_list
+                    self.mask_list += mask_list
+                    print(f'\t{dataset_name}: {len(img_list)} imgs.')
+                else:
+                    print(
+                        f'\tPreTrain dataset {dataset_name} has {len(img_list)} imgs and {len(mask_list)} annots. Not match! Skip.'
+                    )
+            else:
+                print(
+                    f'\tPreTrain dataset {dataset_name} doesn\'t exist. Skip.')
+
+        print(
+            f'{len(self.img_list)} imgs are used for PreTrain. They are from {dataset_list}.'
+        )
+
+        self.aug_type = aug_type
+
+        self.pre_random_horizontal_flip = IT.RandomHorizontalFlip(0.5)
+
+        self.random_horizontal_flip = IT.RandomHorizontalFlip(0.3)
+
+        if self.aug_type == 'v1':
+            self.color_jitter = TF.ColorJitter(0.1, 0.1, 0.1, 0.03)
+        elif self.aug_type == 'v2':
+            self.color_jitter = TF.RandomApply(
+                [TF.ColorJitter(0.4, 0.4, 0.2, 0.1)], p=0.8)
+            self.gray_scale = TF.RandomGrayscale(p=0.2)
+            self.blur = TF.RandomApply([IT.GaussianBlur([.1, 2.])], p=0.3)
+        else:
+            assert NotImplementedError
+
+        self.random_affine = IT.RandomAffine(degrees=20,
+                                             translate=(0.1, 0.1),
+                                             scale=(0.9, 1.1),
+                                             shear=10,
+                                             resample=Image.BICUBIC,
+                                             fillcolor=(124, 116, 104))
+        base_ratio = float(output_size[1]) / output_size[0]
+        self.random_resize_crop = IT.RandomResizedCrop(
+            output_size, (0.8, 1),
+            ratio=(base_ratio * 3. / 4., base_ratio * 4. / 3.),
+            interpolation=Image.BICUBIC)
+        self.to_tensor = TF.ToTensor()
+        self.to_onehot = IT.ToOnehot(max_obj_n, shuffle=True)
+        self.normalize = TF.Normalize((0.485, 0.456, 0.406),
+                                      (0.229, 0.224, 0.225))
+
+    def __len__(self):
+        return len(self.img_list)
+
+    def load_image_in_PIL(self, path, mode='RGB'):
+        img = Image.open(path)
+        img.load()  # Very important for loading large image
+        return img.convert(mode)
+
+    def sample_sequence(self, idx):
+        img_pil = self.load_image_in_PIL(self.img_list[idx], 'RGB')
+        mask_pil = self.load_image_in_PIL(self.mask_list[idx], 'P')
+
+        frames = []
+        masks = []
+
+        img_pil, mask_pil = self.pre_random_horizontal_flip(img_pil, mask_pil)
+        # img_pil, mask_pil = self.pre_random_vertical_flip(img_pil, mask_pil)
+
+        for i in range(self.clip_n):
+            img, mask = img_pil, mask_pil
+
+            if i > 0:
+                img, mask = self.random_horizontal_flip(img, mask)
+                img, mask = self.random_affine(img, mask)
+
+            img = self.color_jitter(img)
+
+            img, mask = self.random_resize_crop(img, mask)
+
+            if self.aug_type == 'v2':
+                img = self.gray_scale(img)
+                img = self.blur(img)
+
+            mask = np.array(mask, np.uint8)
+
+            if i == 0:
+                mask, obj_list = self.to_onehot(mask)
+                obj_num = len(obj_list)
+            else:
+                mask, _ = self.to_onehot(mask, obj_list)
+
+            mask = torch.argmax(mask, dim=0, keepdim=True)
+
+            frames.append(self.normalize(self.to_tensor(img)))
+            masks.append(mask)
+
+        sample = {
+            'ref_img': frames[0],
+            'prev_img': frames[1],
+            'curr_img': frames[2:],
+            'ref_label': masks[0],
+            'prev_label': masks[1],
+            'curr_label': masks[2:]
+        }
+        sample['meta'] = {
+            'seq_name': self.img_list[idx],
+            'frame_num': 1,
+            'obj_num': obj_num
+        }
+
+        return sample
+
+    def __getitem__(self, idx):
+        sample1 = self.sample_sequence(idx)
+
+        if self.dynamic_merge and (sample1['meta']['obj_num'] == 0
+                                   or random.random() < self.merge_prob):
+            rand_idx = np.random.randint(len(self.img_list))
+            while (rand_idx == idx):
+                rand_idx = np.random.randint(len(self.img_list))
+
+            sample2 = self.sample_sequence(rand_idx)
+
+            sample = self.merge_sample(sample1, sample2)
+        else:
+            sample = sample1
+
+        return sample
+
+    def merge_sample(self, sample1, sample2, min_obj_pixels=100):
+        return _merge_sample(sample1, sample2, min_obj_pixels, self.max_obj_n)
+
+
+class VOSTrain(Dataset):
+    def __init__(self,
+                 image_root,
+                 label_root,
+                 imglistdic,
+                 transform=None,
+                 rgb=True,
+                 repeat_time=1,
+                 rand_gap=3,
+                 seq_len=5,
+                 rand_reverse=True,
+                 dynamic_merge=True,
+                 enable_prev_frame=False,
+                 merge_prob=0.3,
+                 max_obj_n=10):
+        self.image_root = image_root
+        self.label_root = label_root
+        self.rand_gap = rand_gap
+        self.seq_len = seq_len
+        self.rand_reverse = rand_reverse
+        self.repeat_time = repeat_time
+        self.transform = transform
+        self.dynamic_merge = dynamic_merge
+        self.merge_prob = merge_prob
+        self.enable_prev_frame = enable_prev_frame
+        self.max_obj_n = max_obj_n
+        self.rgb = rgb
+        self.imglistdic = imglistdic
+        self.seqs = list(self.imglistdic.keys())
+        print('Video Num: {} X {}'.format(len(self.seqs), self.repeat_time))
+
+    def __len__(self):
+        return int(len(self.seqs) * self.repeat_time)
+
+    def reverse_seq(self, imagelist, lablist):
+        if np.random.randint(2) == 1:
+            imagelist = imagelist[::-1]
+            lablist = lablist[::-1]
+        return imagelist, lablist
+
+    def get_ref_index(self,
+                      seqname,
+                      lablist,
+                      objs,
+                      min_fg_pixels=200,
+                      max_try=5):
+        bad_indices = []
+        for _ in range(max_try):
+            ref_index = np.random.randint(len(lablist))
+            if ref_index in bad_indices:
+                continue
+            ref_label = Image.open(
+                os.path.join(self.label_root, seqname, lablist[ref_index]))
+            ref_label = np.array(ref_label, dtype=np.uint8)
+            ref_objs = list(np.unique(ref_label))
+            is_consistent = True
+            for obj in ref_objs:
+                if obj == 0:
+                    continue
+                if obj not in objs:
+                    is_consistent = False
+            xs, ys = np.nonzero(ref_label)
+            if len(xs) > min_fg_pixels and is_consistent:
+                break
+            bad_indices.append(ref_index)
+        return ref_index
+
+    def get_ref_index_v2(self,
+                         seqname,
+                         lablist,
+                         min_fg_pixels=200,
+                         max_try=20,
+                         total_gap=0):
+        search_range = len(lablist) - total_gap
+        if search_range <= 1:
+            return 0
+        bad_indices = []
+        for _ in range(max_try):
+            ref_index = np.random.randint(search_range)
+            if ref_index in bad_indices:
+                continue
+            ref_label = Image.open(
+                os.path.join(self.label_root, seqname, lablist[ref_index]))
+            ref_label = np.array(ref_label, dtype=np.uint8)
+            xs, ys = np.nonzero(ref_label)
+            if len(xs) > min_fg_pixels:
+                break
+            bad_indices.append(ref_index)
+        return ref_index
+
+    def get_curr_gaps(self, seq_len, max_gap=999, max_try=10):
+        for _ in range(max_try):
+            curr_gaps = []
+            total_gap = 0
+            for _ in range(seq_len):
+                gap = int(np.random.randint(self.rand_gap) + 1)
+                total_gap += gap
+                curr_gaps.append(gap)
+            if total_gap <= max_gap:
+                break
+        return curr_gaps, total_gap
+
+    def get_prev_index(self, lablist, total_gap):
+        search_range = len(lablist) - total_gap
+        if search_range > 1:
+            prev_index = np.random.randint(search_range)
+        else:
+            prev_index = 0
+        return prev_index
+
+    def check_index(self, total_len, index, allow_reflect=True):
+        if total_len <= 1:
+            return 0
+
+        if index < 0:
+            if allow_reflect:
+                index = -index
+                index = self.check_index(total_len, index, True)
+            else:
+                index = 0
+        elif index >= total_len:
+            if allow_reflect:
+                index = 2 * (total_len - 1) - index
+                index = self.check_index(total_len, index, True)
+            else:
+                index = total_len - 1
+
+        return index
+
+    def get_curr_indices(self, lablist, prev_index, gaps):
+        total_len = len(lablist)
+        curr_indices = []
+        now_index = prev_index
+        for gap in gaps:
+            now_index += gap
+            curr_indices.append(self.check_index(total_len, now_index))
+        return curr_indices
+
+    def get_image_label(self, seqname, imagelist, lablist, index):
+        image = cv2.imread(
+            os.path.join(self.image_root, seqname, imagelist[index]))
+        image = np.array(image, dtype=np.float32)
+
+        if self.rgb:
+            image = image[:, :, [2, 1, 0]]
+
+        label = Image.open(
+            os.path.join(self.label_root, seqname, lablist[index]))
+        label = np.array(label, dtype=np.uint8)
+
+        return image, label
+
+    def sample_sequence(self, idx):
+        idx = idx % len(self.seqs)
+        seqname = self.seqs[idx]
+        imagelist, lablist = self.imglistdic[seqname]
+        frame_num = len(imagelist)
+        if self.rand_reverse:
+            imagelist, lablist = self.reverse_seq(imagelist, lablist)
+
+        is_consistent = False
+        max_try = 5
+        try_step = 0
+        while (is_consistent is False and try_step < max_try):
+            try_step += 1
+
+            # generate random gaps
+            curr_gaps, total_gap = self.get_curr_gaps(self.seq_len - 1)
+
+            if self.enable_prev_frame:  # prev frame is randomly sampled
+                # get prev frame
+                prev_index = self.get_prev_index(lablist, total_gap)
+                prev_image, prev_label = self.get_image_label(
+                    seqname, imagelist, lablist, prev_index)
+                prev_objs = list(np.unique(prev_label))
+
+                # get curr frames
+                curr_indices = self.get_curr_indices(lablist, prev_index,
+                                                     curr_gaps)
+                curr_images, curr_labels, curr_objs = [], [], []
+                for curr_index in curr_indices:
+                    curr_image, curr_label = self.get_image_label(
+                        seqname, imagelist, lablist, curr_index)
+                    c_objs = list(np.unique(curr_label))
+                    curr_images.append(curr_image)
+                    curr_labels.append(curr_label)
+                    curr_objs.extend(c_objs)
+
+                objs = list(np.unique(prev_objs + curr_objs))
+
+                start_index = prev_index
+                end_index = max(curr_indices)
+                # get ref frame
+                _try_step = 0
+                ref_index = self.get_ref_index_v2(seqname, lablist)
+                while (ref_index > start_index and ref_index <= end_index
+                       and _try_step < max_try):
+                    _try_step += 1
+                    ref_index = self.get_ref_index_v2(seqname, lablist)
+                ref_image, ref_label = self.get_image_label(
+                    seqname, imagelist, lablist, ref_index)
+                ref_objs = list(np.unique(ref_label))
+            else:  # prev frame is next to ref frame
+                # get ref frame
+                ref_index = self.get_ref_index_v2(seqname, lablist)
+
+                ref_image, ref_label = self.get_image_label(
+                    seqname, imagelist, lablist, ref_index)
+                ref_objs = list(np.unique(ref_label))
+
+                # get curr frames
+                curr_indices = self.get_curr_indices(lablist, ref_index,
+                                                     curr_gaps)
+                curr_images, curr_labels, curr_objs = [], [], []
+                for curr_index in curr_indices:
+                    curr_image, curr_label = self.get_image_label(
+                        seqname, imagelist, lablist, curr_index)
+                    c_objs = list(np.unique(curr_label))
+                    curr_images.append(curr_image)
+                    curr_labels.append(curr_label)
+                    curr_objs.extend(c_objs)
+
+                objs = list(np.unique(curr_objs))
+                prev_image, prev_label = curr_images[0], curr_labels[0]
+                curr_images, curr_labels = curr_images[1:], curr_labels[1:]
+
+            is_consistent = True
+            for obj in objs:
+                if obj == 0:
+                    continue
+                if obj not in ref_objs:
+                    is_consistent = False
+                    break
+
+        # get meta info
+        obj_num = list(np.sort(ref_objs))[-1]
+
+        sample = {
+            'ref_img': ref_image,
+            'prev_img': prev_image,
+            'curr_img': curr_images,
+            'ref_label': ref_label,
+            'prev_label': prev_label,
+            'curr_label': curr_labels
+        }
+        sample['meta'] = {
+            'seq_name': seqname,
+            'frame_num': frame_num,
+            'obj_num': obj_num
+        }
+
+        if self.transform is not None:
+            sample = self.transform(sample)
+
+        return sample
+
+    def __getitem__(self, idx):
+        sample1 = self.sample_sequence(idx)
+
+        if self.dynamic_merge and (sample1['meta']['obj_num'] == 0
+                                   or random.random() < self.merge_prob):
+            rand_idx = np.random.randint(len(self.seqs))
+            while (rand_idx == (idx % len(self.seqs))):
+                rand_idx = np.random.randint(len(self.seqs))
+
+            sample2 = self.sample_sequence(rand_idx)
+
+            sample = self.merge_sample(sample1, sample2)
+        else:
+            sample = sample1
+
+        return sample
+
+    def merge_sample(self, sample1, sample2, min_obj_pixels=100):
+        return _merge_sample(sample1, sample2, min_obj_pixels, self.max_obj_n)
+
+
+class DAVIS2017_Train(VOSTrain):
+    def __init__(self,
+                 split=['train'],
+                 root='./DAVIS',
+                 transform=None,
+                 rgb=True,
+                 repeat_time=1,
+                 full_resolution=True,
+                 year=2017,
+                 rand_gap=3,
+                 seq_len=5,
+                 rand_reverse=True,
+                 dynamic_merge=True,
+                 enable_prev_frame=False,
+                 max_obj_n=10,
+                 merge_prob=0.3):
+        if full_resolution:
+            resolution = 'Full-Resolution'
+            if not os.path.exists(os.path.join(root, 'JPEGImages',
+                                               resolution)):
+                print('No Full-Resolution, use 480p instead.')
+                resolution = '480p'
+        else:
+            resolution = '480p'
+        image_root = os.path.join(root, 'JPEGImages', resolution)
+        label_root = os.path.join(root, 'Annotations', resolution)
+        seq_names = []
+        for spt in split:
+            with open(os.path.join(root, 'ImageSets', str(year),
+                                   spt + '.txt')) as f:
+                seqs_tmp = f.readlines()
+            seqs_tmp = list(map(lambda elem: elem.strip(), seqs_tmp))
+            seq_names.extend(seqs_tmp)
+        imglistdic = {}
+        for seq_name in seq_names:
+            images = list(
+                np.sort(os.listdir(os.path.join(image_root, seq_name))))
+            labels = list(
+                np.sort(os.listdir(os.path.join(label_root, seq_name))))
+            imglistdic[seq_name] = (images, labels)
+
+        super(DAVIS2017_Train, self).__init__(image_root,
+                                              label_root,
+                                              imglistdic,
+                                              transform,
+                                              rgb,
+                                              repeat_time,
+                                              rand_gap,
+                                              seq_len,
+                                              rand_reverse,
+                                              dynamic_merge,
+                                              enable_prev_frame,
+                                              merge_prob=merge_prob,
+                                              max_obj_n=max_obj_n)
+
+
+class YOUTUBEVOS_Train(VOSTrain):
+    def __init__(self,
+                 root='./datasets/YTB',
+                 year=2019,
+                 transform=None,
+                 rgb=True,
+                 rand_gap=3,
+                 seq_len=3,
+                 rand_reverse=True,
+                 dynamic_merge=True,
+                 enable_prev_frame=False,
+                 max_obj_n=10,
+                 merge_prob=0.3):
+        root = os.path.join(root, str(year), 'train')
+        image_root = os.path.join(root, 'JPEGImages')
+        label_root = os.path.join(root, 'Annotations')
+        self.seq_list_file = os.path.join(root, 'meta.json')
+        self._check_preprocess()
+        seq_names = list(self.ann_f.keys())
+
+        imglistdic = {}
+        for seq_name in seq_names:
+            data = self.ann_f[seq_name]['objects']
+            obj_names = list(data.keys())
+            images = []
+            labels = []
+            for obj_n in obj_names:
+                if len(data[obj_n]["frames"]) < 2:
+                    print("Short object: " + seq_name + '-' + obj_n)
+                    continue
+                images += list(
+                    map(lambda x: x + '.jpg', list(data[obj_n]["frames"])))
+                labels += list(
+                    map(lambda x: x + '.png', list(data[obj_n]["frames"])))
+            images = np.sort(np.unique(images))
+            labels = np.sort(np.unique(labels))
+            if len(images) < 2:
+                print("Short video: " + seq_name)
+                continue
+            imglistdic[seq_name] = (images, labels)
+
+        super(YOUTUBEVOS_Train, self).__init__(image_root,
+                                               label_root,
+                                               imglistdic,
+                                               transform,
+                                               rgb,
+                                               1,
+                                               rand_gap,
+                                               seq_len,
+                                               rand_reverse,
+                                               dynamic_merge,
+                                               enable_prev_frame,
+                                               merge_prob=merge_prob,
+                                               max_obj_n=max_obj_n)
+
+    def _check_preprocess(self):
+        if not os.path.isfile(self.seq_list_file):
+            print('No such file: {}.'.format(self.seq_list_file))
+            return False
+        else:
+            self.ann_f = json.load(open(self.seq_list_file, 'r'))['videos']
+            return True
+
+
+class TEST(Dataset):
+    def __init__(
+        self,
+        seq_len=3,
+        obj_num=3,
+        transform=None,
+    ):
+        self.seq_len = seq_len
+        self.obj_num = obj_num
+        self.transform = transform
+
+    def __len__(self):
+        return 3000
+
+    def __getitem__(self, idx):
+        img = np.zeros((800, 800, 3)).astype(np.float32)
+        label = np.ones((800, 800)).astype(np.uint8)
+        sample = {
+            'ref_img': img,
+            'prev_img': img,
+            'curr_img': [img] * (self.seq_len - 2),
+            'ref_label': label,
+            'prev_label': label,
+            'curr_label': [label] * (self.seq_len - 2)
+        }
+        sample['meta'] = {
+            'seq_name': 'test',
+            'frame_num': 100,
+            'obj_num': self.obj_num
+        }
+
+        if self.transform is not None:
+            sample = self.transform(sample)
+        return sample

aot/dataloaders/video_transforms.py

@@ -0,0 +1,715 @@
+import random
+import cv2
+import numpy as np
+from PIL import Image
+
+import torch
+import torchvision.transforms as TF
+import dataloaders.image_transforms as IT
+
+cv2.setNumThreads(0)
+
+
+class Resize(object):
+    """Rescale the image in a sample to a given size.
+
+    Args:
+        output_size (tuple or int): Desired output size. If tuple, output is
+            matched to output_size. If int, smaller of image edges is matched
+            to output_size keeping aspect ratio the same.
+    """
+    def __init__(self, output_size, use_padding=False):
+        assert isinstance(output_size, (int, tuple))
+        if isinstance(output_size, int):
+            self.output_size = (output_size, output_size)
+        else:
+            self.output_size = output_size
+        self.use_padding = use_padding
+
+    def __call__(self, sample):
+        return self.padding(sample) if self.use_padding else self.rescale(
+            sample)
+
+    def rescale(self, sample):
+        prev_img = sample['prev_img']
+        h, w = prev_img.shape[:2]
+        if self.output_size == (h, w):
+            return sample
+        else:
+            new_h, new_w = self.output_size
+
+        for elem in sample.keys():
+            if 'meta' in elem:
+                continue
+            tmp = sample[elem]
+
+            if elem == 'prev_img' or elem == 'curr_img' or elem == 'ref_img':
+                flagval = cv2.INTER_CUBIC
+            else:
+                flagval = cv2.INTER_NEAREST
+
+            if elem == 'curr_img' or elem == 'curr_label':
+                new_tmp = []
+                all_tmp = tmp
+                for tmp in all_tmp:
+                    tmp = cv2.resize(tmp,
+                                     dsize=(new_w, new_h),
+                                     interpolation=flagval)
+                    new_tmp.append(tmp)
+                tmp = new_tmp
+            else:
+                tmp = cv2.resize(tmp,
+                                 dsize=(new_w, new_h),
+                                 interpolation=flagval)
+
+            sample[elem] = tmp
+
+        return sample
+
+    def padding(self, sample):
+        prev_img = sample['prev_img']
+        h, w = prev_img.shape[:2]
+        if self.output_size == (h, w):
+            return sample
+        else:
+            new_h, new_w = self.output_size
+
+        def sep_pad(x):
+            x0 = np.random.randint(0, x + 1)
+            x1 = x - x0
+            return x0, x1
+
+        top_pad, bottom_pad = sep_pad(new_h - h)
+        left_pad, right_pad = sep_pad(new_w - w)
+
+        for elem in sample.keys():
+            if 'meta' in elem:
+                continue
+            tmp = sample[elem]
+
+            if elem == 'prev_img' or elem == 'curr_img' or elem == 'ref_img':
+                pad_value = (124, 116, 104)
+            else:
+                pad_value = (0)
+
+            if elem == 'curr_img' or elem == 'curr_label':
+                new_tmp = []
+                all_tmp = tmp
+                for tmp in all_tmp:
+                    tmp = cv2.copyMakeBorder(tmp,
+                                             top_pad,
+                                             bottom_pad,
+                                             left_pad,
+                                             right_pad,
+                                             cv2.BORDER_CONSTANT,
+                                             value=pad_value)
+                    new_tmp.append(tmp)
+                tmp = new_tmp
+            else:
+                tmp = cv2.copyMakeBorder(tmp,
+                                         top_pad,
+                                         bottom_pad,
+                                         left_pad,
+                                         right_pad,
+                                         cv2.BORDER_CONSTANT,
+                                         value=pad_value)
+
+            sample[elem] = tmp
+
+        return sample
+
+
+class BalancedRandomCrop(object):
+    """Crop randomly the image in a sample.
+
+    Args:
+        output_size (tuple or int): Desired output size. If int, square crop
+            is made.
+    """
+    def __init__(self,
+                 output_size,
+                 max_step=5,
+                 max_obj_num=5,
+                 min_obj_pixel_num=100):
+        assert isinstance(output_size, (int, tuple))
+        if isinstance(output_size, int):
+            self.output_size = (output_size, output_size)
+        else:
+            assert len(output_size) == 2
+            self.output_size = output_size
+        self.max_step = max_step
+        self.max_obj_num = max_obj_num
+        self.min_obj_pixel_num = min_obj_pixel_num
+
+    def __call__(self, sample):
+
+        image = sample['prev_img']
+        h, w = image.shape[:2]
+        new_h, new_w = self.output_size
+        new_h = h if new_h >= h else new_h
+        new_w = w if new_w >= w else new_w
+        ref_label = sample["ref_label"]
+        prev_label = sample["prev_label"]
+        curr_label = sample["curr_label"]
+
+        is_contain_obj = False
+        step = 0
+        while (not is_contain_obj) and (step < self.max_step):
+            step += 1
+            top = np.random.randint(0, h - new_h + 1)
+            left = np.random.randint(0, w - new_w + 1)
+            after_crop = []
+            contains = []
+            for elem in ([ref_label, prev_label] + curr_label):
+                tmp = elem[top:top + new_h, left:left + new_w]
+                contains.append(np.unique(tmp))
+                after_crop.append(tmp)
+
+            all_obj = list(np.sort(contains[0]))
+
+            if all_obj[-1] == 0:
+                continue
+
+            # remove background
+            if all_obj[0] == 0:
+                all_obj = all_obj[1:]
+
+            # remove small obj
+            new_all_obj = []
+            for obj_id in all_obj:
+                after_crop_pixels = np.sum(after_crop[0] == obj_id)
+                if after_crop_pixels > self.min_obj_pixel_num:
+                    new_all_obj.append(obj_id)
+
+            if len(new_all_obj) == 0:
+                is_contain_obj = False
+            else:
+                is_contain_obj = True
+
+            if len(new_all_obj) > self.max_obj_num:
+                random.shuffle(new_all_obj)
+                new_all_obj = new_all_obj[:self.max_obj_num]
+
+            all_obj = [0] + new_all_obj
+
+        post_process = []
+        for elem in after_crop:
+            new_elem = elem * 0
+            for idx in range(len(all_obj)):
+                obj_id = all_obj[idx]
+                if obj_id == 0:
+                    continue
+                mask = elem == obj_id
+
+                new_elem += (mask * idx).astype(np.uint8)
+            post_process.append(new_elem.astype(np.uint8))
+
+        sample["ref_label"] = post_process[0]
+        sample["prev_label"] = post_process[1]
+        curr_len = len(sample["curr_img"])
+        sample["curr_label"] = []
+        for idx in range(curr_len):
+            sample["curr_label"].append(post_process[idx + 2])
+
+        for elem in sample.keys():
+            if 'meta' in elem or 'label' in elem:
+                continue
+            if elem == 'curr_img':
+                new_tmp = []
+                for tmp_ in sample[elem]:
+                    tmp_ = tmp_[top:top + new_h, left:left + new_w]
+                    new_tmp.append(tmp_)
+                sample[elem] = new_tmp
+            else:
+                tmp = sample[elem]
+                tmp = tmp[top:top + new_h, left:left + new_w]
+                sample[elem] = tmp
+
+        obj_num = len(all_obj) - 1
+
+        sample['meta']['obj_num'] = obj_num
+
+        return sample
+
+
+class RandomScale(object):
+    """Randomly resize the image and the ground truth to specified scales.
+    Args:
+        scales (list): the list of scales
+    """
+    def __init__(self, min_scale=1., max_scale=1.3, short_edge=None):
+        self.min_scale = min_scale
+        self.max_scale = max_scale
+        self.short_edge = short_edge
+
+    def __call__(self, sample):
+        # Fixed range of scales
+        sc = np.random.uniform(self.min_scale, self.max_scale)
+        # Align short edge
+        if self.short_edge is not None:
+            image = sample['prev_img']
+            h, w = image.shape[:2]
+            if h > w:
+                sc *= float(self.short_edge) / w
+            else:
+                sc *= float(self.short_edge) / h
+
+        for elem in sample.keys():
+            if 'meta' in elem:
+                continue
+            tmp = sample[elem]
+
+            if elem == 'prev_img' or elem == 'curr_img' or elem == 'ref_img':
+                flagval = cv2.INTER_CUBIC
+            else:
+                flagval = cv2.INTER_NEAREST
+
+            if elem == 'curr_img' or elem == 'curr_label':
+                new_tmp = []
+                for tmp_ in tmp:
+                    tmp_ = cv2.resize(tmp_,
+                                      None,
+                                      fx=sc,
+                                      fy=sc,
+                                      interpolation=flagval)
+                    new_tmp.append(tmp_)
+                tmp = new_tmp
+            else:
+                tmp = cv2.resize(tmp,
+                                 None,
+                                 fx=sc,
+                                 fy=sc,
+                                 interpolation=flagval)
+
+            sample[elem] = tmp
+
+        return sample
+
+
+class RandomScaleV2(object):
+    """Randomly resize the image and the ground truth to specified scales.
+    Args:
+        scales (list): the list of scales
+    """
+    def __init__(self,
+                 min_scale=0.36,
+                 max_scale=1.0,
+                 short_edge=None,
+                 ratio=[3. / 4., 4. / 3.]):
+        self.min_scale = min_scale
+        self.max_scale = max_scale
+        self.short_edge = short_edge
+        self.ratio = ratio
+
+    def __call__(self, sample):
+        image = sample['prev_img']
+        h, w = image.shape[:2]
+
+        new_h, new_w = self.get_params(h, w)
+
+        sc_x = float(new_w) / w
+        sc_y = float(new_h) / h
+
+        # Align short edge
+        if not (self.short_edge is None):
+            if h > w:
+                sc_x *= float(self.short_edge) / w
+                sc_y *= float(self.short_edge) / w
+            else:
+                sc_x *= float(self.short_edge) / h
+                sc_y *= float(self.short_edge) / h
+
+        for elem in sample.keys():
+            if 'meta' in elem:
+                continue
+            tmp = sample[elem]
+
+            if elem == 'prev_img' or elem == 'curr_img' or elem == 'ref_img':
+                flagval = cv2.INTER_CUBIC
+            else:
+                flagval = cv2.INTER_NEAREST
+
+            if elem == 'curr_img' or elem == 'curr_label':
+                new_tmp = []
+                for tmp_ in tmp:
+                    tmp_ = cv2.resize(tmp_,
+                                      None,
+                                      fx=sc_x,
+                                      fy=sc_y,
+                                      interpolation=flagval)
+                    new_tmp.append(tmp_)
+                tmp = new_tmp
+            else:
+                tmp = cv2.resize(tmp,
+                                 None,
+                                 fx=sc_x,
+                                 fy=sc_y,
+                                 interpolation=flagval)
+
+            sample[elem] = tmp
+
+        return sample
+
+    def get_params(self, height, width):
+        area = height * width
+
+        log_ratio = [np.log(item) for item in self.ratio]
+        for _ in range(10):
+            target_area = area * np.random.uniform(self.min_scale**2,
+                                                   self.max_scale**2)
+            aspect_ratio = np.exp(np.random.uniform(log_ratio[0],
+                                                    log_ratio[1]))
+
+            w = int(round(np.sqrt(target_area * aspect_ratio)))
+            h = int(round(np.sqrt(target_area / aspect_ratio)))
+
+            if 0 < w <= width and 0 < h <= height:
+                return h, w
+
+        # Fallback to central crop
+        in_ratio = float(width) / float(height)
+        if in_ratio < min(self.ratio):
+            w = width
+            h = int(round(w / min(self.ratio)))
+        elif in_ratio > max(self.ratio):
+            h = height
+            w = int(round(h * max(self.ratio)))
+        else:  # whole image
+            w = width
+            h = height
+
+        return h, w
+
+class RestrictSize(object):
+    """Randomly resize the image and the ground truth to specified scales.
+    Args:
+        scales (list): the list of scales
+    """
+    def __init__(self, max_short_edge=None, max_long_edge=800 * 1.3):
+        self.max_short_edge = max_short_edge
+        self.max_long_edge = max_long_edge
+        assert ((max_short_edge is None)) or ((max_long_edge is None))
+
+    def __call__(self, sample):
+
+        # Fixed range of scales
+        sc = None
+        image = sample['ref_img']
+        h, w = image.shape[:2]
+        # Align short edge
+        if not (self.max_short_edge is None):
+            if h > w:
+                short_edge = w
+            else:
+                short_edge = h
+            if short_edge < self.max_short_edge:
+                sc = float(self.max_short_edge) / short_edge
+        else:
+            if h > w:
+                long_edge = h
+            else:
+                long_edge = w
+            if long_edge > self.max_long_edge:
+                sc = float(self.max_long_edge) / long_edge
+
+        if sc is None:
+            new_h = h
+            new_w = w
+        else:
+            new_h = int(sc * h)
+            new_w = int(sc * w)
+        new_h = new_h - (new_h - 1) % 4
+        new_w = new_w - (new_w - 1) % 4
+        if new_h == h and new_w == w:
+            return sample
+
+        for elem in sample.keys():
+            if 'meta' in elem:
+                continue
+            tmp = sample[elem]
+
+            if 'label' in elem:
+                flagval = cv2.INTER_NEAREST
+            else:
+                flagval = cv2.INTER_CUBIC
+
+            tmp = cv2.resize(tmp, dsize=(new_w, new_h), interpolation=flagval)
+
+            sample[elem] = tmp
+
+        return sample
+
+
+class RandomHorizontalFlip(object):
+    """Horizontally flip the given image and ground truth randomly with a probability of 0.5."""
+    def __init__(self, prob):
+        self.p = prob
+
+    def __call__(self, sample):
+
+        if random.random() < self.p:
+            for elem in sample.keys():
+                if 'meta' in elem:
+                    continue
+                if elem == 'curr_img' or elem == 'curr_label':
+                    new_tmp = []
+                    for tmp_ in sample[elem]:
+                        tmp_ = cv2.flip(tmp_, flipCode=1)
+                        new_tmp.append(tmp_)
+                    sample[elem] = new_tmp
+                else:
+                    tmp = sample[elem]
+                    tmp = cv2.flip(tmp, flipCode=1)
+                    sample[elem] = tmp
+
+        return sample
+
+
+class RandomVerticalFlip(object):
+    """Vertically flip the given image and ground truth randomly with a probability of 0.5."""
+    def __init__(self, prob=0.3):
+        self.p = prob
+
+    def __call__(self, sample):
+
+        if random.random() < self.p:
+            for elem in sample.keys():
+                if 'meta' in elem:
+                    continue
+                if elem == 'curr_img' or elem == 'curr_label':
+                    new_tmp = []
+                    for tmp_ in sample[elem]:
+                        tmp_ = cv2.flip(tmp_, flipCode=0)
+                        new_tmp.append(tmp_)
+                    sample[elem] = new_tmp
+                else:
+                    tmp = sample[elem]
+                    tmp = cv2.flip(tmp, flipCode=0)
+                    sample[elem] = tmp
+
+        return sample
+
+
+class RandomGaussianBlur(object):
+    def __init__(self, prob=0.3, sigma=[0.1, 2.]):
+        self.aug = TF.RandomApply([IT.GaussianBlur(sigma)], p=prob)
+
+    def __call__(self, sample):
+        for elem in sample.keys():
+            if 'meta' in elem or 'label' in elem:
+                continue
+
+            if elem == 'curr_img':
+                new_tmp = []
+                for tmp_ in sample[elem]:
+                    tmp_ = self.apply_augmentation(tmp_)
+                    new_tmp.append(tmp_)
+                sample[elem] = new_tmp
+            else:
+                tmp = sample[elem]
+                tmp = self.apply_augmentation(tmp)
+                sample[elem] = tmp
+        return sample
+
+    def apply_augmentation(self, x):
+        x = Image.fromarray(np.uint8(x))
+        x = self.aug(x)
+        x = np.array(x, dtype=np.float32)
+        return x
+
+
+class RandomGrayScale(RandomGaussianBlur):
+    def __init__(self, prob=0.2):
+        self.aug = TF.RandomGrayscale(p=prob)
+
+
+class RandomColorJitter(RandomGaussianBlur):
+    def __init__(self,
+                 prob=0.8,
+                 brightness=0.4,
+                 contrast=0.4,
+                 saturation=0.2,
+                 hue=0.1):
+        self.aug = TF.RandomApply(
+            [TF.ColorJitter(brightness, contrast, saturation, hue)], p=prob)
+
+
+class SubtractMeanImage(object):
+    def __init__(self, mean, change_channels=False):
+        self.mean = mean
+        self.change_channels = change_channels
+
+    def __call__(self, sample):
+        for elem in sample.keys():
+            if 'image' in elem:
+                if self.change_channels:
+                    sample[elem] = sample[elem][:, :, [2, 1, 0]]
+                sample[elem] = np.subtract(
+                    sample[elem], np.array(self.mean, dtype=np.float32))
+        return sample
+
+    def __str__(self):
+        return 'SubtractMeanImage' + str(self.mean)
+
+
+class ToTensor(object):
+    """Convert ndarrays in sample to Tensors."""
+    def __call__(self, sample):
+
+        for elem in sample.keys():
+            if 'meta' in elem:
+                continue
+            tmp = sample[elem]
+
+            if elem == 'curr_img' or elem == 'curr_label':
+                new_tmp = []
+                for tmp_ in tmp:
+                    if tmp_.ndim == 2:
+                        tmp_ = tmp_[:, :, np.newaxis]
+                        tmp_ = tmp_.transpose((2, 0, 1))
+                        new_tmp.append(torch.from_numpy(tmp_).int())
+                    else:
+                        tmp_ = tmp_ / 255.
+                        tmp_ -= (0.485, 0.456, 0.406)
+                        tmp_ /= (0.229, 0.224, 0.225)
+                        tmp_ = tmp_.transpose((2, 0, 1))
+                        new_tmp.append(torch.from_numpy(tmp_))
+                tmp = new_tmp
+            else:
+                if tmp.ndim == 2:
+                    tmp = tmp[:, :, np.newaxis]
+                    tmp = tmp.transpose((2, 0, 1))
+                    tmp = torch.from_numpy(tmp).int()
+                else:
+                    tmp = tmp / 255.
+                    tmp -= (0.485, 0.456, 0.406)
+                    tmp /= (0.229, 0.224, 0.225)
+                    tmp = tmp.transpose((2, 0, 1))
+                    tmp = torch.from_numpy(tmp)
+            sample[elem] = tmp
+
+        return sample
+
+
+class MultiRestrictSize(object):
+    def __init__(self,
+                 max_short_edge=None,
+                 max_long_edge=800,
+                 flip=False,
+                 multi_scale=[1.3],
+                 align_corners=True,
+                 max_stride=16):
+        self.max_short_edge = max_short_edge
+        self.max_long_edge = max_long_edge
+        self.multi_scale = multi_scale
+        self.flip = flip
+        self.align_corners = align_corners
+        self.max_stride = max_stride
+
+    def __call__(self, sample):
+        samples = []
+        image = sample['current_img']
+        h, w = image.shape[:2]
+        for scale in self.multi_scale:
+            # restrict short edge
+            sc = 1.
+            if self.max_short_edge is not None:
+                if h > w:
+                    short_edge = w
+                else:
+                    short_edge = h
+                if short_edge > self.max_short_edge:
+                    sc *= float(self.max_short_edge) / short_edge
+            new_h, new_w = sc * h, sc * w
+
+            # restrict long edge
+            sc = 1.
+            if self.max_long_edge is not None:
+                if new_h > new_w:
+                    long_edge = new_h
+                else:
+                    long_edge = new_w
+                if long_edge > self.max_long_edge:
+                    sc *= float(self.max_long_edge) / long_edge
+
+            new_h, new_w = sc * new_h, sc * new_w
+
+            new_h = int(new_h * scale)
+            new_w = int(new_w * scale)
+
+            if self.align_corners:
+                if (new_h - 1) % self.max_stride != 0:
+                    new_h = int(
+                        np.around((new_h - 1) / self.max_stride) *
+                        self.max_stride + 1)
+                if (new_w - 1) % self.max_stride != 0:
+                    new_w = int(
+                        np.around((new_w - 1) / self.max_stride) *
+                        self.max_stride + 1)
+            else:
+                if new_h % self.max_stride != 0:
+                    new_h = int(
+                        np.around(new_h / self.max_stride) * self.max_stride)
+                if new_w % self.max_stride != 0:
+                    new_w = int(
+                        np.around(new_w / self.max_stride) * self.max_stride)
+
+            if new_h == h and new_w == w:
+                samples.append(sample)
+            else:
+                new_sample = {}
+                for elem in sample.keys():
+                    if 'meta' in elem:
+                        new_sample[elem] = sample[elem]
+                        continue
+                    tmp = sample[elem]
+                    if 'label' in elem:
+                        new_sample[elem] = sample[elem]
+                        continue
+                    else:
+                        flagval = cv2.INTER_CUBIC
+                        tmp = cv2.resize(tmp,
+                                         dsize=(new_w, new_h),
+                                         interpolation=flagval)
+                        new_sample[elem] = tmp
+                samples.append(new_sample)
+
+            if self.flip:
+                now_sample = samples[-1]
+                new_sample = {}
+                for elem in now_sample.keys():
+                    if 'meta' in elem:
+                        new_sample[elem] = now_sample[elem].copy()
+                        new_sample[elem]['flip'] = True
+                        continue
+                    tmp = now_sample[elem]
+                    tmp = tmp[:, ::-1].copy()
+                    new_sample[elem] = tmp
+                samples.append(new_sample)
+
+        return samples
+
+
+class MultiToTensor(object):
+    def __call__(self, samples):
+        for idx in range(len(samples)):
+            sample = samples[idx]
+            for elem in sample.keys():
+                if 'meta' in elem:
+                    continue
+                tmp = sample[elem]
+                if tmp is None:
+                    continue
+
+                if tmp.ndim == 2:
+                    tmp = tmp[:, :, np.newaxis]
+                    tmp = tmp.transpose((2, 0, 1))
+                    samples[idx][elem] = torch.from_numpy(tmp).int()
+                else:
+                    tmp = tmp / 255.
+                    tmp -= (0.485, 0.456, 0.406)
+                    tmp /= (0.229, 0.224, 0.225)
+                    tmp = tmp.transpose((2, 0, 1))
+                    samples[idx][elem] = torch.from_numpy(tmp)
+
+        return samples

aot/datasets/DAVIS/README.md

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+Put DAVIS 2017 here.

aot/datasets/Static/README.md

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+Put the static dataset here. Guidance can be found in [AFB-URR](https://github.com/xmlyqing00/AFB-URR), which we referred to in the implementation of the pre-training.

aot/datasets/YTB/2018/train/README.md

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+Put the training split of YouTube-VOS 2018 here.

aot/datasets/YTB/2018/valid/README.md

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+Put the validation split of YouTube-VOS 2018 here.