Model Card for biformer_s_il-all

A BiFormer image classification model. This model was trained on the il-all dataset, encompassing all relevant bird species found in Israel, including rarities.

The species list is derived from data available at https://www.israbirding.com/checklist/.

Model Details

• Model Type: Image classification and detection backbone

• Model Stats:

  • Params (M): 25.3
  • Input image size: 384 x 384

• Dataset: il-all (550 classes)

• Papers:

  • BiFormer: Vision Transformer with Bi-Level Routing Attention: https://arxiv.org/abs/2303.08810

Model Usage

Image Classification

import birder
from birder.inference.classification import infer_image

(net, class_to_idx, signature, rgb_stats) = birder.load_pretrained_model("biformer_s_il-all", inference=True)

# Get the image size the model was trained on
size = birder.get_size_from_signature(signature)

# Create an inference transform
transform = birder.classification_transform(size, rgb_stats)

image = "path/to/image.jpeg"  # or a PIL image, must be loaded in RGB format
(out, _) = infer_image(net, image, transform)
# out is a NumPy array with shape of (1, num_classes), representing class probabilities.

Image Embeddings

import birder
from birder.inference.classification import infer_image

(net, class_to_idx, signature, rgb_stats) = birder.load_pretrained_model("biformer_s_il-all", inference=True)

# Get the image size the model was trained on
size = birder.get_size_from_signature(signature)

# Create an inference transform
transform = birder.classification_transform(size, rgb_stats)

image = "path/to/image.jpeg"  # or a PIL image
(out, embedding) = infer_image(net, image, transform, return_embedding=True)
# embedding is a NumPy array with shape of (1, embedding_size)

Detection Feature Map

from PIL import Image
import birder

(net, class_to_idx, signature, rgb_stats) = birder.load_pretrained_model("biformer_s_il-all", inference=True)

# Get the image size the model was trained on
size = birder.get_size_from_signature(signature)

# Create an inference transform
transform = birder.classification_transform(size, rgb_stats)

image = Image.open("path/to/image.jpeg")
features = net.detection_features(transform(image).unsqueeze(0))
# features is a dict (stage name -> torch.Tensor)
print([(k, v.size()) for k, v in features.items()])
# Output example:
# [('stage1', torch.Size([1, 96, 96, 96])),
#  ('stage2', torch.Size([1, 192, 48, 48])),
#  ('stage3', torch.Size([1, 384, 24, 24])),
#  ('stage4', torch.Size([1, 768, 12, 12]))]

Citation

@misc{zhu2023biformervisiontransformerbilevel,
      title={BiFormer: Vision Transformer with Bi-Level Routing Attention}, 
      author={Lei Zhu and Xinjiang Wang and Zhanghan Ke and Wayne Zhang and Rynson Lau},
      year={2023},
      eprint={2303.08810},
      archivePrefix={arXiv},
      primaryClass={cs.CV},
      url={https://arxiv.org/abs/2303.08810}, 
}