Create mamba_vision.py

mamba_vision.py

@@ -0,0 +1,865 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2024, NVIDIA CORPORATION.  All rights reserved.
+#
+# NVIDIA CORPORATION and its licensors retain all intellectual property
+# and proprietary rights in and to this software, related documentation
+# and any modifications thereto.  Any use, reproduction, disclosure or
+# distribution of this software and related documentation without an express
+# license agreement from NVIDIA CORPORATION is strictly prohibited.
+
+
+import torch
+import torch.nn as nn
+from timm.models.registry import register_model
+import math
+from timm.models.layers import trunc_normal_, DropPath, LayerNorm2d
+from timm.models._builder import resolve_pretrained_cfg
+try:
+    from timm.models._builder import _update_default_kwargs as update_args
+except:
+    from timm.models._builder import _update_default_model_kwargs as update_args
+from timm.models.vision_transformer import Mlp, PatchEmbed
+from timm.models.layers import DropPath, trunc_normal_
+from timm.models.registry import register_model
+import torch.nn.functional as F
+from mamba_ssm.ops.selective_scan_interface import selective_scan_fn
+from einops import rearrange, repeat
+from pathlib import Path
+from huggingface_hub import PyTorchModelHubMixin
+
+
+def _cfg(url='', **kwargs):
+    return {'url': url,
+            'num_classes': 1000,
+            'input_size': (3, 224, 224),
+            'pool_size': None,
+            'crop_pct': 0.875,
+            'interpolation': 'bicubic',
+            'fixed_input_size': True,
+            'mean': (0.485, 0.456, 0.406),
+            'std': (0.229, 0.224, 0.225),
+            **kwargs
+            }
+
+
+default_cfgs = {
+    'mamba_vision_T': _cfg(url='https://huggingface.co/nvidia/MambaVision-T-1K/resolve/main/mambavision_tiny_1k.pth.tar',
+                           crop_pct=1.0,
+                           input_size=(3, 224, 224),
+                           crop_mode='center'),
+    'mamba_vision_T2': _cfg(url='https://huggingface.co/nvidia/MambaVision-T2-1K/resolve/main/mambavision_tiny2_1k.pth.tar',
+                            crop_pct=0.98,
+                            input_size=(3, 224, 224),
+                            crop_mode='center'),
+    'mamba_vision_S': _cfg(url='https://huggingface.co/nvidia/MambaVision-S-1K/resolve/main/mambavision_small_1k.pth.tar',
+                           crop_pct=0.93,
+                           input_size=(3, 224, 224),
+                           crop_mode='center'),
+    'mamba_vision_B': _cfg(url='https://huggingface.co/nvidia/MambaVision-B-1K/resolve/main/mambavision_base_1k.pth.tar',
+                           crop_pct=1.0,
+                           input_size=(3, 224, 224),
+                           crop_mode='center'),
+    'mamba_vision_L': _cfg(url='https://huggingface.co/nvidia/MambaVision-L-1K/resolve/main/mambavision_large_1k.pth.tar',
+                           crop_pct=1.0,
+                           input_size=(3, 224, 224),
+                           crop_mode='center'),
+    'mamba_vision_L2': _cfg(url='https://huggingface.co/nvidia/MambaVision-L2-1K/resolve/main/mambavision_large2_1k.pth.tar',
+                            crop_pct=1.0,
+                            input_size=(3, 224, 224),
+                            crop_mode='center')                                
+}
+
+
+def window_partition(x, window_size):
+    """
+    Args:
+        x: (B, C, H, W)
+        window_size: window size
+        h_w: Height of window
+        w_w: Width of window
+    Returns:
+        local window features (num_windows*B, window_size*window_size, C)
+    """
+    B, C, H, W = x.shape
+    x = x.view(B, C, H // window_size, window_size, W // window_size, window_size)
+    windows = x.permute(0, 2, 4, 3, 5, 1).reshape(-1, window_size*window_size, C)
+    return windows
+
+
+def window_reverse(windows, window_size, H, W):
+    """
+    Args:
+        windows: local window features (num_windows*B, window_size, window_size, C)
+        window_size: Window size
+        H: Height of image
+        W: Width of image
+    Returns:
+        x: (B, C, H, W)
+    """
+    B = int(windows.shape[0] / (H * W / window_size / window_size))
+    x = windows.reshape(B, H // window_size, W // window_size, window_size, window_size, -1)
+    x = x.permute(0, 5, 1, 3, 2, 4).reshape(B,windows.shape[2], H, W)
+    return x
+
+
+def _load_state_dict(module, state_dict, strict=False, logger=None):
+    """Load state_dict to a module.
+
+    This method is modified from :meth:`torch.nn.Module.load_state_dict`.
+    Default value for ``strict`` is set to ``False`` and the message for
+    param mismatch will be shown even if strict is False.
+
+    Args:
+        module (Module): Module that receives the state_dict.
+        state_dict (OrderedDict): Weights.
+        strict (bool): whether to strictly enforce that the keys
+            in :attr:`state_dict` match the keys returned by this module's
+            :meth:`~torch.nn.Module.state_dict` function. Default: ``False``.
+        logger (:obj:`logging.Logger`, optional): Logger to log the error
+            message. If not specified, print function will be used.
+    """
+    unexpected_keys = []
+    all_missing_keys = []
+    err_msg = []
+
+    metadata = getattr(state_dict, '_metadata', None)
+    state_dict = state_dict.copy()
+    if metadata is not None:
+        state_dict._metadata = metadata
+    
+    def load(module, prefix=''):
+        local_metadata = {} if metadata is None else metadata.get(
+            prefix[:-1], {})
+        module._load_from_state_dict(state_dict, prefix, local_metadata, True,
+                                     all_missing_keys, unexpected_keys,
+                                     err_msg)
+        for name, child in module._modules.items():
+            if child is not None:
+                load(child, prefix + name + '.')
+
+    load(module)
+    load = None
+    missing_keys = [
+        key for key in all_missing_keys if 'num_batches_tracked' not in key
+    ]
+
+    if unexpected_keys:
+        err_msg.append('unexpected key in source '
+                       f'state_dict: {", ".join(unexpected_keys)}\n')
+    if missing_keys:
+        err_msg.append(
+            f'missing keys in source state_dict: {", ".join(missing_keys)}\n')
+
+    
+    if len(err_msg) > 0:
+        err_msg.insert(
+            0, 'The model and loaded state dict do not match exactly\n')
+        err_msg = '\n'.join(err_msg)
+        if strict:
+            raise RuntimeError(err_msg)
+        elif logger is not None:
+            logger.warning(err_msg)
+        else:
+            print(err_msg)
+
+
+def _load_checkpoint(model,
+                    filename,
+                    map_location='cpu',
+                    strict=False,
+                    logger=None):
+    """Load checkpoint from a file or URI.
+
+    Args:
+        model (Module): Module to load checkpoint.
+        filename (str): Accept local filepath, URL, ``torchvision://xxx``,
+            ``open-mmlab://xxx``. Please refer to ``docs/model_zoo.md`` for
+            details.
+        map_location (str): Same as :func:`torch.load`.
+        strict (bool): Whether to allow different params for the model and
+            checkpoint.
+        logger (:mod:`logging.Logger` or None): The logger for error message.
+
+    Returns:
+        dict or OrderedDict: The loaded checkpoint.
+    """
+    checkpoint = torch.load(filename, map_location=map_location)
+    if not isinstance(checkpoint, dict):
+        raise RuntimeError(
+            f'No state_dict found in checkpoint file {filename}')
+    if 'state_dict' in checkpoint:
+        state_dict = checkpoint['state_dict']
+    elif 'model' in checkpoint:
+        state_dict = checkpoint['model']
+    else:
+        state_dict = checkpoint
+    if list(state_dict.keys())[0].startswith('module.'):
+        state_dict = {k[7:]: v for k, v in state_dict.items()}
+
+    if sorted(list(state_dict.keys()))[0].startswith('encoder'):
+        state_dict = {k.replace('encoder.', ''): v for k, v in state_dict.items() if k.startswith('encoder.')}
+
+    _load_state_dict(model, state_dict, strict, logger)
+    return checkpoint
+
+
+class Downsample(nn.Module):
+    """
+    Down-sampling block"
+    """
+
+    def __init__(self,
+                 dim,
+                 keep_dim=False,
+                 ):
+        """
+        Args:
+            dim: feature size dimension.
+            norm_layer: normalization layer.
+            keep_dim: bool argument for maintaining the resolution.
+        """
+
+        super().__init__()
+        if keep_dim:
+            dim_out = dim
+        else:
+            dim_out = 2 * dim
+        self.reduction = nn.Sequential(
+            nn.Conv2d(dim, dim_out, 3, 2, 1, bias=False),
+        )
+
+    def forward(self, x):
+        x = self.reduction(x)
+        return x
+
+
+class PatchEmbed(nn.Module):
+    """
+    Patch embedding block"
+    """
+
+    def __init__(self, in_chans=3, in_dim=64, dim=96):
+        """
+        Args:
+            in_chans: number of input channels.
+            dim: feature size dimension.
+        """
+        # in_dim = 1
+        super().__init__()
+        self.proj = nn.Identity()
+        self.conv_down = nn.Sequential(
+            nn.Conv2d(in_chans, in_dim, 3, 2, 1, bias=False),
+            nn.BatchNorm2d(in_dim, eps=1e-4),
+            nn.ReLU(),
+            nn.Conv2d(in_dim, dim, 3, 2, 1, bias=False),
+            nn.BatchNorm2d(dim, eps=1e-4),
+            nn.ReLU()
+            )
+
+    def forward(self, x):
+        x = self.proj(x)
+        x = self.conv_down(x)
+        return x
+
+
+class ConvBlock(nn.Module):
+
+    def __init__(self, dim,
+                 drop_path=0.,
+                 layer_scale=None,
+                 kernel_size=3):
+        super().__init__()
+
+        self.conv1 = nn.Conv2d(dim, dim, kernel_size=kernel_size, stride=1, padding=1)
+        self.norm1 = nn.BatchNorm2d(dim, eps=1e-5)
+        self.act1 = nn.GELU(approximate= 'tanh')
+        self.conv2 = nn.Conv2d(dim, dim, kernel_size=kernel_size, stride=1, padding=1)
+        self.norm2 = nn.BatchNorm2d(dim, eps=1e-5)
+        self.layer_scale = layer_scale
+        if layer_scale is not None and type(layer_scale) in [int, float]:
+            self.gamma = nn.Parameter(layer_scale * torch.ones(dim))
+            self.layer_scale = True
+        else:
+            self.layer_scale = False
+        self.drop_path = DropPath(drop_path) if drop_path > 0. else nn.Identity()
+
+    def forward(self, x):
+        input = x
+        x = self.conv1(x)
+        x = self.norm1(x)
+        x = self.act1(x)
+        x = self.conv2(x)
+        x = self.norm2(x)
+        if self.layer_scale:
+            x = x * self.gamma.view(1, -1, 1, 1)
+        x = input + self.drop_path(x)
+        return x
+
+
+class MambaVisionMixer(nn.Module):
+    def __init__(
+        self,
+        d_model,
+        d_state=16,
+        d_conv=4,
+        expand=2,
+        dt_rank="auto",
+        dt_min=0.001,
+        dt_max=0.1,
+        dt_init="random",
+        dt_scale=1.0,
+        dt_init_floor=1e-4,
+        conv_bias=True,
+        bias=False,
+        use_fast_path=True, 
+        layer_idx=None,
+        device=None,
+        dtype=None,
+    ):
+        factory_kwargs = {"device": device, "dtype": dtype}
+        super().__init__()
+        self.d_model = d_model
+        self.d_state = d_state
+        self.d_conv = d_conv
+        self.expand = expand
+        self.d_inner = int(self.expand * self.d_model)
+        self.dt_rank = math.ceil(self.d_model / 16) if dt_rank == "auto" else dt_rank
+        self.use_fast_path = use_fast_path
+        self.layer_idx = layer_idx
+        self.in_proj = nn.Linear(self.d_model, self.d_inner, bias=bias, **factory_kwargs)    
+        self.x_proj = nn.Linear(
+            self.d_inner//2, self.dt_rank + self.d_state * 2, bias=False, **factory_kwargs
+        )
+        self.dt_proj = nn.Linear(self.dt_rank, self.d_inner//2, bias=True, **factory_kwargs)
+        dt_init_std = self.dt_rank**-0.5 * dt_scale
+        if dt_init == "constant":
+            nn.init.constant_(self.dt_proj.weight, dt_init_std)
+        elif dt_init == "random":
+            nn.init.uniform_(self.dt_proj.weight, -dt_init_std, dt_init_std)
+        else:
+            raise NotImplementedError
+        dt = torch.exp(
+            torch.rand(self.d_inner//2, **factory_kwargs) * (math.log(dt_max) - math.log(dt_min))
+            + math.log(dt_min)
+        ).clamp(min=dt_init_floor)
+        inv_dt = dt + torch.log(-torch.expm1(-dt))
+        with torch.no_grad():
+            self.dt_proj.bias.copy_(inv_dt)
+        self.dt_proj.bias._no_reinit = True
+        A = repeat(
+            torch.arange(1, self.d_state + 1, dtype=torch.float32, device=device),
+            "n -> d n",
+            d=self.d_inner//2,
+        ).contiguous()
+        A_log = torch.log(A)
+        self.A_log = nn.Parameter(A_log)
+        self.A_log._no_weight_decay = True
+        self.D = nn.Parameter(torch.ones(self.d_inner//2, device=device))
+        self.D._no_weight_decay = True
+        self.out_proj = nn.Linear(self.d_inner, self.d_model, bias=bias, **factory_kwargs)
+        self.conv1d_x = nn.Conv1d(
+            in_channels=self.d_inner//2,
+            out_channels=self.d_inner//2,
+            bias=conv_bias//2,
+            kernel_size=d_conv,
+            groups=self.d_inner//2,
+            **factory_kwargs,
+        )
+        self.conv1d_z = nn.Conv1d(
+            in_channels=self.d_inner//2,
+            out_channels=self.d_inner//2,
+            bias=conv_bias//2,
+            kernel_size=d_conv,
+            groups=self.d_inner//2,
+            **factory_kwargs,
+        )
+
+    def forward(self, hidden_states):
+        """
+        hidden_states: (B, L, D)
+        Returns: same shape as hidden_states
+        """
+        _, seqlen, _ = hidden_states.shape
+        xz = self.in_proj(hidden_states)
+        xz = rearrange(xz, "b l d -> b d l")
+        x, z = xz.chunk(2, dim=1)
+        A = -torch.exp(self.A_log.float())
+        x = F.silu(F.conv1d(input=x, weight=self.conv1d_x.weight, bias=self.conv1d_x.bias, padding='same', groups=self.d_inner//2))
+        z = F.silu(F.conv1d(input=z, weight=self.conv1d_z.weight, bias=self.conv1d_z.bias, padding='same', groups=self.d_inner//2))
+        x_dbl = self.x_proj(rearrange(x, "b d l -> (b l) d"))
+        dt, B, C = torch.split(x_dbl, [self.dt_rank, self.d_state, self.d_state], dim=-1)
+        dt = rearrange(self.dt_proj(dt), "(b l) d -> b d l", l=seqlen)
+        B = rearrange(B, "(b l) dstate -> b dstate l", l=seqlen).contiguous()
+        C = rearrange(C, "(b l) dstate -> b dstate l", l=seqlen).contiguous()
+        y = selective_scan_fn(x, 
+                              dt, 
+                              A, 
+                              B, 
+                              C, 
+                              self.D.float(), 
+                              z=None, 
+                              delta_bias=self.dt_proj.bias.float(), 
+                              delta_softplus=True, 
+                              return_last_state=None)
+        
+        y = torch.cat([y, z], dim=1)
+        y = rearrange(y, "b d l -> b l d")
+        out = self.out_proj(y)
+        return out
+    
+
+class Attention(nn.Module):
+
+    def __init__(
+            self,
+            dim,
+            num_heads=8,
+            qkv_bias=False,
+            qk_norm=False,
+            attn_drop=0.,
+            proj_drop=0.,
+            norm_layer=nn.LayerNorm,
+    ):
+        super().__init__()
+        assert dim % num_heads == 0
+        self.num_heads = num_heads
+        self.head_dim = dim // num_heads
+        self.scale = self.head_dim ** -0.5
+        self.fused_attn = True
+
+        self.qkv = nn.Linear(dim, dim * 3, bias=qkv_bias)
+        self.q_norm = norm_layer(self.head_dim) if qk_norm else nn.Identity()
+        self.k_norm = norm_layer(self.head_dim) if qk_norm else nn.Identity()
+        self.attn_drop = nn.Dropout(attn_drop)
+        self.proj = nn.Linear(dim, dim)
+        self.proj_drop = nn.Dropout(proj_drop)
+
+    def forward(self, x):
+        B, N, C = x.shape
+        qkv = self.qkv(x).reshape(B, N, 3, self.num_heads, self.head_dim).permute(2, 0, 3, 1, 4)
+        q, k, v = qkv.unbind(0)
+        q, k = self.q_norm(q), self.k_norm(k)
+
+        if self.fused_attn:
+            x = F.scaled_dot_product_attention(
+             q, k, v,
+                dropout_p=self.attn_drop.p,
+            )
+        else:
+            q = q * self.scale
+            attn = q @ k.transpose(-2, -1)
+            attn = attn.softmax(dim=-1)
+            attn = self.attn_drop(attn)
+            x = attn @ v
+
+        x = x.transpose(1, 2).reshape(B, N, C)
+        x = self.proj(x)
+        x = self.proj_drop(x)
+        return x
+
+
+class Block(nn.Module):
+    def __init__(self, 
+                 dim, 
+                 num_heads, 
+                 counter, 
+                 transformer_blocks, 
+                 mlp_ratio=4., 
+                 qkv_bias=False, 
+                 qk_scale=False, 
+                 drop=0., 
+                 attn_drop=0.,
+                 drop_path=0., 
+                 act_layer=nn.GELU, 
+                 norm_layer=nn.LayerNorm, 
+                 Mlp_block=Mlp,
+                 layer_scale=None,
+                 ):
+        super().__init__()
+        self.norm1 = norm_layer(dim)
+        if counter in transformer_blocks:
+            self.mixer = Attention(
+            dim,
+            num_heads=num_heads,
+            qkv_bias=qkv_bias,
+            qk_norm=qk_scale,
+            attn_drop=attn_drop,
+            proj_drop=drop,
+            norm_layer=norm_layer,
+        )
+        else:
+            self.mixer = MambaVisionMixer(d_model=dim, 
+                                          d_state=8,  
+                                          d_conv=3,    
+                                          expand=1
+                                          )
+
+        self.drop_path = DropPath(drop_path) if drop_path > 0. else nn.Identity()
+        self.norm2 = norm_layer(dim)
+        mlp_hidden_dim = int(dim * mlp_ratio)
+        self.mlp = Mlp_block(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=act_layer, drop=drop)
+        use_layer_scale = layer_scale is not None and type(layer_scale) in [int, float]
+        self.gamma_1 = nn.Parameter(layer_scale * torch.ones(dim))  if use_layer_scale else 1
+        self.gamma_2 = nn.Parameter(layer_scale * torch.ones(dim))  if use_layer_scale else 1
+
+    def forward(self, x):
+        x = x + self.drop_path(self.gamma_1 * self.mixer(self.norm1(x)))
+        x = x + self.drop_path(self.gamma_2 * self.mlp(self.norm2(x)))
+        return x
+
+
+class MambaVisionLayer(nn.Module):
+    """
+    MambaVision layer"
+    """
+
+    def __init__(self,
+                 dim,
+                 depth,
+                 num_heads,
+                 window_size,
+                 conv=False,
+                 downsample=True,
+                 mlp_ratio=4.,
+                 qkv_bias=True,
+                 qk_scale=None,
+                 drop=0.,
+                 attn_drop=0.,
+                 drop_path=0.,
+                 layer_scale=None,
+                 layer_scale_conv=None,
+                 transformer_blocks = [],
+    ):
+        """
+        Args:
+            dim: feature size dimension.
+            depth: number of layers in each stage.
+            window_size: window size in each stage.
+            conv: bool argument for conv stage flag.
+            downsample: bool argument for down-sampling.
+            mlp_ratio: MLP ratio.
+            num_heads: number of heads in each stage.
+            qkv_bias: bool argument for query, key, value learnable bias.
+            qk_scale: bool argument to scaling query, key.
+            drop: dropout rate.
+            attn_drop: attention dropout rate.
+            drop_path: drop path rate.
+            norm_layer: normalization layer.
+            layer_scale: layer scaling coefficient.
+            layer_scale_conv: conv layer scaling coefficient.
+            transformer_blocks: list of transformer blocks.
+        """
+
+        super().__init__()
+        self.conv = conv
+        self.transformer_block = False
+        if conv:
+            self.blocks = nn.ModuleList([ConvBlock(dim=dim,
+                                                   drop_path=drop_path[i] if isinstance(drop_path, list) else drop_path,
+                                                   layer_scale=layer_scale_conv)
+                                                   for i in range(depth)])
+            self.transformer_block = False
+        else:
+            self.transformer_block = True
+            self.blocks = nn.ModuleList([Block(dim=dim,
+                                               counter=i, 
+                                               transformer_blocks=transformer_blocks,
+                                               num_heads=num_heads,
+                                               mlp_ratio=mlp_ratio,
+                                               qkv_bias=qkv_bias,
+                                               qk_scale=qk_scale,
+                                               drop=drop,
+                                               attn_drop=attn_drop,
+                                               drop_path=drop_path[i] if isinstance(drop_path, list) else drop_path,
+                                               layer_scale=layer_scale)
+                                               for i in range(depth)])
+            self.transformer_block = True
+
+        self.downsample = None if not downsample else Downsample(dim=dim)
+        self.do_gt = False
+        self.window_size = window_size
+
+    def forward(self, x):
+        _, _, H, W = x.shape
+
+        if self.transformer_block:
+            pad_r = (self.window_size - W % self.window_size) % self.window_size
+            pad_b = (self.window_size - H % self.window_size) % self.window_size
+            if pad_r > 0 or pad_b > 0:
+                x = torch.nn.functional.pad(x, (0,pad_r,0,pad_b))
+                _, _, Hp, Wp = x.shape
+            else:
+                Hp, Wp = H, W
+            x = window_partition(x, self.window_size)
+
+        for _, blk in enumerate(self.blocks):
+            x = blk(x)
+        if self.transformer_block:
+            x = window_reverse(x, self.window_size, Hp, Wp)
+            if pad_r > 0 or pad_b > 0:
+                x = x[:, :, :H, :W].contiguous()
+        if self.downsample is None:
+            return x
+        return self.downsample(x)
+
+
+class MambaVision(nn.Module, PyTorchModelHubMixin):
+    """
+    MambaVision,
+    """
+
+    def __init__(self,
+                 dim,
+                 in_dim,
+                 depths,
+                 window_size,
+                 mlp_ratio,
+                 num_heads,
+                 drop_path_rate=0.2,
+                 in_chans=3,
+                 num_classes=1000,
+                 qkv_bias=True,
+                 qk_scale=None,
+                 drop_rate=0.,
+                 attn_drop_rate=0.,
+                 layer_scale=None,
+                 layer_scale_conv=None,
+                 **kwargs):
+        """
+        Args:
+            dim: feature size dimension.
+            depths: number of layers in each stage.
+            window_size: window size in each stage.
+            mlp_ratio: MLP ratio.
+            num_heads: number of heads in each stage.
+            drop_path_rate: drop path rate.
+            in_chans: number of input channels.
+            num_classes: number of classes.
+            qkv_bias: bool argument for query, key, value learnable bias.
+            qk_scale: bool argument to scaling query, key.
+            drop_rate: dropout rate.
+            attn_drop_rate: attention dropout rate.
+            norm_layer: normalization layer.
+            layer_scale: layer scaling coefficient.
+            layer_scale_conv: conv layer scaling coefficient.
+        """
+        super().__init__()
+        num_features = int(dim * 2 ** (len(depths) - 1))
+        self.num_classes = num_classes
+        self.patch_embed = PatchEmbed(in_chans=in_chans, in_dim=in_dim, dim=dim)
+        dpr = [x.item() for x in torch.linspace(0, drop_path_rate, sum(depths))]
+        self.levels = nn.ModuleList()
+        for i in range(len(depths)):
+            conv = True if (i == 0 or i == 1) else False
+            level = MambaVisionLayer(dim=int(dim * 2 ** i),
+                                     depth=depths[i],
+                                     num_heads=num_heads[i],
+                                     window_size=window_size[i],
+                                     mlp_ratio=mlp_ratio,
+                                     qkv_bias=qkv_bias,
+                                     qk_scale=qk_scale,
+                                     conv=conv,
+                                     drop=drop_rate,
+                                     attn_drop=attn_drop_rate,
+                                     drop_path=dpr[sum(depths[:i]):sum(depths[:i + 1])],
+                                     downsample=(i < 3),
+                                     layer_scale=layer_scale,
+                                     layer_scale_conv=layer_scale_conv,
+                                     transformer_blocks=list(range(depths[i]//2+1, depths[i])) if depths[i]%2!=0 else list(range(depths[i]//2, depths[i])),
+                                     )
+            self.levels.append(level)
+        self.norm = nn.BatchNorm2d(num_features)
+        self.avgpool = nn.AdaptiveAvgPool2d(1)
+        self.head = nn.Linear(num_features, num_classes) if num_classes > 0 else nn.Identity()
+        self.apply(self._init_weights)
+
+    def _init_weights(self, m):
+        if isinstance(m, nn.Linear):
+            trunc_normal_(m.weight, std=.02)
+            if isinstance(m, nn.Linear) and m.bias is not None:
+                nn.init.constant_(m.bias, 0)
+        elif isinstance(m, nn.LayerNorm):
+            nn.init.constant_(m.bias, 0)
+            nn.init.constant_(m.weight, 1.0)
+        elif isinstance(m, LayerNorm2d):
+            nn.init.constant_(m.bias, 0)
+            nn.init.constant_(m.weight, 1.0)
+        elif isinstance(m, nn.BatchNorm2d):
+            nn.init.ones_(m.weight)
+            nn.init.zeros_(m.bias)
+
+    @torch.jit.ignore
+    def no_weight_decay_keywords(self):
+        return {'rpb'}
+
+    def forward_features(self, x):
+        x = self.patch_embed(x)
+        for level in self.levels:
+            x = level(x)
+        x = self.norm(x)
+        x = self.avgpool(x)
+        x = torch.flatten(x, 1)
+        return x
+
+    def forward(self, x):
+        x = self.forward_features(x)
+        x = self.head(x)
+        return x
+
+    def _load_state_dict(self, 
+                         pretrained, 
+                         strict: bool = False):
+        _load_checkpoint(self, 
+                         pretrained, 
+                         strict=strict)
+
+
+@register_model
+def mamba_vision_T(pretrained=False, **kwargs):
+    model_path = kwargs.pop("model_path", "/tmp/mamba_vision_T.pth.tar")
+    pretrained_cfg = resolve_pretrained_cfg('mamba_vision_T').to_dict()
+    update_args(pretrained_cfg, kwargs, kwargs_filter=None)
+    model = MambaVision(depths=[1, 3, 8, 4],
+                        num_heads=[2, 4, 8, 16],
+                        window_size=[8, 8, 14, 7],
+                        dim=80,
+                        in_dim=32,
+                        mlp_ratio=4,
+                        resolution=224,
+                        drop_path_rate=0.2,
+                        **kwargs)
+    model.pretrained_cfg = pretrained_cfg
+    model.default_cfg = model.pretrained_cfg
+    if pretrained:
+        if not Path(model_path).is_file():
+            url = model.default_cfg['url']
+            torch.hub.download_url_to_file(url=url, dst=model_path)
+        model._load_state_dict(model_path)
+    return model
+
+
+@register_model
+def mamba_vision_T2(pretrained=False, **kwargs):
+    model_path = kwargs.pop("model_path", "/tmp/mamba_vision_T2.pth.tar")
+    pretrained_cfg = resolve_pretrained_cfg('mamba_vision_T2').to_dict()
+    update_args(pretrained_cfg, kwargs, kwargs_filter=None)
+    model = MambaVision(depths=[1, 3, 11, 4],
+                        num_heads=[2, 4, 8, 16],
+                        window_size=[8, 8, 14, 7],
+                        dim=80,
+                        in_dim=32,
+                        mlp_ratio=4,
+                        resolution=224,
+                        drop_path_rate=0.2,
+                        **kwargs)
+    model.pretrained_cfg = pretrained_cfg
+    model.default_cfg = model.pretrained_cfg
+    if pretrained:
+        if not Path(model_path).is_file():
+            url = model.default_cfg['url']
+            torch.hub.download_url_to_file(url=url, dst=model_path)
+        model._load_state_dict(model_path)
+    return model
+
+
+@register_model
+def mamba_vision_S(pretrained=False, **kwargs):
+    model_path = kwargs.pop("model_path", "/tmp/mamba_vision_S.pth.tar")
+    pretrained_cfg = resolve_pretrained_cfg('mamba_vision_S').to_dict()
+    update_args(pretrained_cfg, kwargs, kwargs_filter=None)
+    model = MambaVision(depths=[3, 3, 7, 5],
+                        num_heads=[2, 4, 8, 16],
+                        window_size=[8, 8, 14, 7],
+                        dim=96,
+                        in_dim=64,
+                        mlp_ratio=4,
+                        resolution=224,
+                        drop_path_rate=0.2,
+                        **kwargs)
+    model.pretrained_cfg = pretrained_cfg
+    model.default_cfg = model.pretrained_cfg
+    if pretrained:
+        if not Path(model_path).is_file():
+            url = model.default_cfg['url']
+            torch.hub.download_url_to_file(url=url, dst=model_path)
+        model._load_state_dict(model_path)
+    return model
+
+
+@register_model
+def mamba_vision_B(pretrained=False, **kwargs):
+    model_path = kwargs.pop("model_path", "/tmp/mamba_vision_B.pth.tar")
+    pretrained_cfg = resolve_pretrained_cfg('mamba_vision_B').to_dict()
+    update_args(pretrained_cfg, kwargs, kwargs_filter=None)
+    model = MambaVision(depths=[3, 3, 10, 5],
+                        num_heads=[2, 4, 8, 16],
+                        window_size=[8, 8, 14, 7],
+                        dim=128,
+                        in_dim=64,
+                        mlp_ratio=4,
+                        resolution=224,
+                        drop_path_rate=0.3,
+                        layer_scale=1e-5,
+                        layer_scale_conv=None,
+                        **kwargs)
+    model.pretrained_cfg = pretrained_cfg
+    model.default_cfg = model.pretrained_cfg
+    if pretrained:
+        if not Path(model_path).is_file():
+            url = model.default_cfg['url']
+            torch.hub.download_url_to_file(url=url, dst=model_path)
+        model._load_state_dict(model_path)
+    return model
+
+
+@register_model
+def mamba_vision_L(pretrained=False, **kwargs):
+    model_path = kwargs.pop("model_path", "/tmp/mamba_vision_L.pth.tar")
+    pretrained_cfg = resolve_pretrained_cfg('mamba_vision_L').to_dict()
+    update_args(pretrained_cfg, kwargs, kwargs_filter=None)
+    model = MambaVision(depths=[3, 3, 10, 5],
+                        num_heads=[4, 8, 16, 32],
+                        window_size=[8, 8, 14, 7],
+                        dim=196,
+                        in_dim=64,
+                        mlp_ratio=4,
+                        resolution=224,
+                        drop_path_rate=0.3,
+                        layer_scale=1e-5,
+                        layer_scale_conv=None,
+                        **kwargs)
+    model.pretrained_cfg = pretrained_cfg
+    model.default_cfg = model.pretrained_cfg
+    if pretrained:
+        if not Path(model_path).is_file():
+            url = model.default_cfg['url']
+            torch.hub.download_url_to_file(url=url, dst=model_path)
+        model._load_state_dict(model_path)
+    return model
+
+
+@register_model
+def mamba_vision_L2(pretrained=False, **kwargs):
+    model_path = kwargs.pop("model_path", "/tmp/mamba_vision_L2.pth.tar")
+    pretrained_cfg = resolve_pretrained_cfg('mamba_vision_L2').to_dict()
+    update_args(pretrained_cfg, kwargs, kwargs_filter=None)
+    model = MambaVision(depths=[3, 3, 12, 5],
+                        num_heads=[4, 8, 16, 32],
+                        window_size=[8, 8, 14, 7],
+                        dim=196,
+                        in_dim=64,
+                        mlp_ratio=4,
+                        resolution=224,
+                        drop_path_rate=0.3,
+                        layer_scale=1e-5,
+                        layer_scale_conv=None,
+                        **kwargs)
+    model.pretrained_cfg = pretrained_cfg
+    model.default_cfg = model.pretrained_cfg
+    if pretrained:
+        if not Path(model_path).is_file():
+            url = model.default_cfg['url']
+            torch.hub.download_url_to_file(url=url, dst=model_path)
+        model._load_state_dict(model_path)
+    return model