Support npz custom load for vision transformer hybrid models. Add posembed rescale for npz load.

timm/models/layers/pool2d_same.py

@@ -27,7 +27,8 @@ class AvgPool2dSame(nn.AvgPool2d):
         super(AvgPool2dSame, self).__init__(kernel_size, stride, (0, 0), ceil_mode, count_include_pad)
 
     def forward(self, x):
-        return avg_pool2d_same(
+        x = pad_same(x, self.kernel_size, self.stride)
+        return F.avg_pool2d(
             x, self.kernel_size, self.stride, self.padding, self.ceil_mode, self.count_include_pad)
 
 
@@ -41,14 +42,15 @@ def max_pool2d_same(
 class MaxPool2dSame(nn.MaxPool2d):
     """ Tensorflow like 'SAME' wrapper for 2D max pooling
     """
-    def __init__(self, kernel_size: int, stride=None, padding=0, dilation=1, ceil_mode=False, count_include_pad=True):
+    def __init__(self, kernel_size: int, stride=None, padding=0, dilation=1, ceil_mode=False):
         kernel_size = to_2tuple(kernel_size)
         stride = to_2tuple(stride)
         dilation = to_2tuple(dilation)
-        super(MaxPool2dSame, self).__init__(kernel_size, stride, (0, 0), dilation, ceil_mode, count_include_pad)
+        super(MaxPool2dSame, self).__init__(kernel_size, stride, (0, 0), dilation, ceil_mode)
 
     def forward(self, x):
-        return max_pool2d_same(x, self.kernel_size, self.stride, self.padding, self.dilation, self.ceil_mode)
+        x = pad_same(x, self.kernel_size, self.stride, value=-float('inf'))
+        return F.max_pool2d(x, self.kernel_size, self.stride, (0, 0), self.dilation, self.ceil_mode)
 
 
 def create_pool2d(pool_type, kernel_size, stride=None, **kwargs):

timm/models/vision_transformer.py

@@ -52,6 +52,10 @@ default_cfgs = {
         url='',
         mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5),
     ),
+    'vit_tiny_patch16_384': _cfg(
+        url='',
+        input_size=(3, 384, 384), mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5), crop_pct=1.0
+    ),
     'vit_small_patch16_224': _cfg(
         url='',
         mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5),
@@ -60,6 +64,14 @@ default_cfgs = {
         url='',
         mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5),
     ),
+    'vit_small_patch16_384': _cfg(
+        url='',
+        input_size=(3, 384, 384), mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5), crop_pct=1.0
+    ),
+    'vit_small_patch32_384': _cfg(
+        url='',
+        input_size=(3, 384, 384), mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5), crop_pct=1.0
+    ),
 
     # patch models (weights ported from official Google JAX impl)
     'vit_base_patch16_224': _cfg(
@@ -102,6 +114,7 @@ default_cfgs = {
         url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-vitjx/jx_vit_large_patch32_224_in21k-9046d2e7.pth',
         num_classes=21843, mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5)),
     'vit_huge_patch14_224_in21k': _cfg(
+        url='https://storage.googleapis.com/vit_models/imagenet21k/ViT-H_14.npz',
         hf_hub='timm/vit_huge_patch14_224_in21k',
         num_classes=21843, mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5)),
 
@@ -371,24 +384,53 @@ def _load_weights(model: VisionTransformer, checkpoint_path: str, prefix: str =
     import numpy as np
 
     def _n2p(w, t=True):
-        if t and w.ndim == 4:
-            w = w.transpose([3, 2, 0, 1])
-        elif t and w.ndim == 3:
-            w = w.transpose([2, 0, 1])
-        elif t and w.ndim == 2:
-            w = w.transpose([1, 0])
+        if w.ndim == 4 and w.shape[0] == w.shape[1] == w.shape[2] == 1:
+            w = w.flatten()
+        if t:
+            if w.ndim == 4:
+                w = w.transpose([3, 2, 0, 1])
+            elif w.ndim == 3:
+                w = w.transpose([2, 0, 1])
+            elif w.ndim == 2:
+                w = w.transpose([1, 0])
         return torch.from_numpy(w)
 
     w = np.load(checkpoint_path)
-    if not prefix:
-        prefix = 'opt/target/' if 'opt/target/embedding/kernel' in w else prefix
-
-    input_conv_w = adapt_input_conv(
-        model.patch_embed.proj.weight.shape[1], _n2p(w[f'{prefix}embedding/kernel']))
-    model.patch_embed.proj.weight.copy_(input_conv_w)
+    if not prefix and 'opt/target/embedding/kernel' in w:
+        prefix = 'opt/target/'
+
+    if hasattr(model.patch_embed, 'backbone'):
+        # hybrid
+        backbone = model.patch_embed.backbone
+        stem_only = not hasattr(backbone, 'stem')
+        stem = backbone if stem_only else backbone.stem
+        stem.conv.weight.copy_(adapt_input_conv(stem.conv.weight.shape[1], _n2p(w[f'{prefix}conv_root/kernel'])))
+        stem.norm.weight.copy_(_n2p(w[f'{prefix}gn_root/scale']))
+        stem.norm.bias.copy_(_n2p(w[f'{prefix}gn_root/bias']))
+        if not stem_only:
+            for i, stage in enumerate(backbone.stages):
+                for j, block in enumerate(stage.blocks):
+                    bp = f'{prefix}block{i + 1}/unit{j + 1}/'
+                    for r in range(3):
+                        getattr(block, f'conv{r + 1}').weight.copy_(_n2p(w[f'{bp}conv{r + 1}/kernel']))
+                        getattr(block, f'norm{r + 1}').weight.copy_(_n2p(w[f'{bp}gn{r + 1}/scale']))
+                        getattr(block, f'norm{r + 1}').bias.copy_(_n2p(w[f'{bp}gn{r + 1}/bias']))
+                    if block.downsample is not None:
+                        block.downsample.conv.weight.copy_(_n2p(w[f'{bp}conv_proj/kernel']))
+                        block.downsample.norm.weight.copy_(_n2p(w[f'{bp}gn_proj/scale']))
+                        block.downsample.norm.bias.copy_(_n2p(w[f'{bp}gn_proj/bias']))
+        embed_conv_w = _n2p(w[f'{prefix}embedding/kernel'])
+    else:
+        embed_conv_w = adapt_input_conv(
+            model.patch_embed.proj.weight.shape[1], _n2p(w[f'{prefix}embedding/kernel']))
+    model.patch_embed.proj.weight.copy_(embed_conv_w)
     model.patch_embed.proj.bias.copy_(_n2p(w[f'{prefix}embedding/bias']))
     model.cls_token.copy_(_n2p(w[f'{prefix}cls'], t=False))
-    model.pos_embed.copy_(_n2p(w[f'{prefix}Transformer/posembed_input/pos_embedding'], t=False))
+    pos_embed_w = _n2p(w[f'{prefix}Transformer/posembed_input/pos_embedding'], t=False)
+    if pos_embed_w.shape != model.pos_embed.shape:
+        pos_embed_w = resize_pos_embed(  # resize pos embedding when different size from pretrained weights
+            pos_embed_w, model.pos_embed, getattr(model, 'num_tokens', 1), model.patch_embed.grid_size)
+    model.pos_embed.copy_(pos_embed_w)
     model.norm.weight.copy_(_n2p(w[f'{prefix}Transformer/encoder_norm/scale']))
     model.norm.bias.copy_(_n2p(w[f'{prefix}Transformer/encoder_norm/bias']))
     if model.head.bias.shape[0] == w[f'{prefix}head/bias'].shape[-1]:
@@ -396,23 +438,18 @@ def _load_weights(model: VisionTransformer, checkpoint_path: str, prefix: str =
         model.head.bias.copy_(_n2p(w[f'{prefix}head/bias']))
     for i, block in enumerate(model.blocks.children()):
         block_prefix = f'{prefix}Transformer/encoderblock_{i}/'
+        mha_prefix = block_prefix + 'MultiHeadDotProductAttention_1/'
         block.norm1.weight.copy_(_n2p(w[f'{block_prefix}LayerNorm_0/scale']))
         block.norm1.bias.copy_(_n2p(w[f'{block_prefix}LayerNorm_0/bias']))
-        mha_prefix = block_prefix + 'MultiHeadDotProductAttention_1/'
         block.attn.qkv.weight.copy_(torch.cat([
-            _n2p(w[f'{mha_prefix}query/kernel'], t=False).flatten(1).T,
-            _n2p(w[f'{mha_prefix}key/kernel'], t=False).flatten(1).T,
-            _n2p(w[f'{mha_prefix}value/kernel'], t=False).flatten(1).T]))
+            _n2p(w[f'{mha_prefix}{n}/kernel'], t=False).flatten(1).T for n in ('query', 'key', 'value')]))
         block.attn.qkv.bias.copy_(torch.cat([
-            _n2p(w[f'{mha_prefix}query/bias'], t=False).reshape(-1),
-            _n2p(w[f'{mha_prefix}key/bias'], t=False).reshape(-1),
-            _n2p(w[f'{mha_prefix}value/bias'], t=False).reshape(-1)]))
+            _n2p(w[f'{mha_prefix}{n}/bias'], t=False).reshape(-1) for n in ('query', 'key', 'value')]))
         block.attn.proj.weight.copy_(_n2p(w[f'{mha_prefix}out/kernel']).flatten(1))
         block.attn.proj.bias.copy_(_n2p(w[f'{mha_prefix}out/bias']))
-        block.mlp.fc1.weight.copy_(_n2p(w[f'{block_prefix}MlpBlock_3/Dense_0/kernel']))
-        block.mlp.fc1.bias.copy_(_n2p(w[f'{block_prefix}MlpBlock_3/Dense_0/bias']))
-        block.mlp.fc2.weight.copy_(_n2p(w[f'{block_prefix}MlpBlock_3/Dense_1/kernel']))
-        block.mlp.fc2.bias.copy_(_n2p(w[f'{block_prefix}MlpBlock_3/Dense_1/bias']))
+        for r in range(2):
+            getattr(block.mlp, f'fc{r + 1}').weight.copy_(_n2p(w[f'{block_prefix}MlpBlock_3/Dense_{r}/kernel']))
+            getattr(block.mlp, f'fc{r + 1}').bias.copy_(_n2p(w[f'{block_prefix}MlpBlock_3/Dense_{r}/bias']))
         block.norm2.weight.copy_(_n2p(w[f'{block_prefix}LayerNorm_2/scale']))
         block.norm2.bias.copy_(_n2p(w[f'{block_prefix}LayerNorm_2/bias']))
 
@@ -478,6 +515,7 @@ def _create_vision_transformer(variant, pretrained=False, default_cfg=None, **kw
         default_cfg=default_cfg,
         representation_size=repr_size,
         pretrained_filter_fn=checkpoint_filter_fn,
+        pretrained_custom_load='npz' in default_cfg['url'],
         **kwargs)
     return model
 
@@ -510,6 +548,16 @@ def vit_small_patch32_224(pretrained=False, **kwargs):
     return model
 
 
+@register_model
+def vit_small_patch16_384(pretrained=False, **kwargs):
+    """ ViT-Small (ViT-S/16)
+    NOTE I've replaced my previous 'small' model definition and weights with the small variant from the DeiT paper
+    """
+    model_kwargs = dict(patch_size=16, embed_dim=384, depth=12, num_heads=6, **kwargs)
+    model = _create_vision_transformer('vit_small_patch16_384', pretrained=pretrained, **model_kwargs)
+    return model
+
+
 @register_model
 def vit_base_patch16_224(pretrained=False, **kwargs):
     """ ViT-Base (ViT-B/16) from original paper (https://arxiv.org/abs/2010.11929).

timm/models/vision_transformer_hybrid.py

@@ -35,26 +35,34 @@ def _cfg(url='', **kwargs):
 
 
 default_cfgs = {
-    # hybrid in-21k models (weights ported from official Google JAX impl where they exist)
-    'vit_base_r50_s16_224_in21k': _cfg(
-        url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-vitjx/jx_vit_base_resnet50_224_in21k-6f7c7740.pth',
-        num_classes=21843, crop_pct=0.9),
-
-    # hybrid in-1k models (weights ported from official JAX impl)
-    'vit_base_r50_s16_384': _cfg(
-        url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-vitjx/jx_vit_base_resnet50_384-9fd3c705.pth',
-        input_size=(3, 384, 384), crop_pct=1.0),
-
-    # hybrid in-1k models (mostly untrained, experimental configs w/ resnetv2 stdconv backbones)
+    # hybrid in-1k models (weights ported from official JAX impl where they exist)
     'vit_tiny_r_s16_p8_224': _cfg(first_conv='patch_embed.backbone.conv'),
+    'vit_tiny_r_s16_p8_384': _cfg(
+        first_conv='patch_embed.backbone.conv', input_size=(3, 384, 384), crop_pct=1.0),
     'vit_small_r_s16_p8_224': _cfg(first_conv='patch_embed.backbone.conv'),
     'vit_small_r20_s16_p2_224': _cfg(),
     'vit_small_r20_s16_224': _cfg(),
     'vit_small_r26_s32_224': _cfg(),
+    'vit_small_r26_s32_384': _cfg(
+        input_size=(3, 384, 384), crop_pct=1.0),
     'vit_base_r20_s16_224': _cfg(),
     'vit_base_r26_s32_224': _cfg(),
     'vit_base_r50_s16_224': _cfg(),
+    'vit_base_r50_s16_384': _cfg(
+        url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-vitjx/jx_vit_base_resnet50_384-9fd3c705.pth',
+        input_size=(3, 384, 384), crop_pct=1.0),
     'vit_large_r50_s32_224': _cfg(),
+    'vit_large_r50_s32_384': _cfg(),
+
+    # hybrid in-21k models (weights ported from official Google JAX impl where they exist)
+    'vit_small_r26_s32_224_in21k': _cfg(
+        num_classes=21843, crop_pct=0.9),
+    'vit_small_r26_s32_384_in21k': _cfg(
+        num_classes=21843, input_size=(3, 384, 384), crop_pct=1.0),
+    'vit_base_r50_s16_224_in21k': _cfg(
+        url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-vitjx/jx_vit_base_resnet50_224_in21k-6f7c7740.pth',
+        num_classes=21843, crop_pct=0.9),
+    'vit_large_r50_s32_224_in21k': _cfg(num_classes=21843, crop_pct=0.9),
 
     # hybrid models (using timm resnet backbones)
     'vit_small_resnet26d_224': _cfg(
@@ -99,7 +107,8 @@ class HybridEmbed(nn.Module):
             else:
                 feature_dim = self.backbone.num_features
         assert feature_size[0] % patch_size[0] == 0 and feature_size[1] % patch_size[1] == 0
-        self.num_patches = feature_size[0] // patch_size[0] * feature_size[1] // patch_size[1]
+        self.grid_size = (feature_size[0] // patch_size[0], feature_size[1] // patch_size[1])
+        self.num_patches = self.grid_size[0] * self.grid_size[1]
         self.proj = nn.Conv2d(feature_dim, embed_dim, kernel_size=patch_size, stride=patch_size)
 
     def forward(self, x):
@@ -133,37 +142,35 @@ def _resnetv2(layers=(3, 4, 9), **kwargs):
 
 
 @register_model
-def vit_base_r50_s16_224_in21k(pretrained=False, **kwargs):
-    """ R50+ViT-B/16 hybrid model from original paper (https://arxiv.org/abs/2010.11929).
-    ImageNet-21k weights @ 224x224, source https://github.com/google-research/vision_transformer.
+def vit_tiny_r_s16_p8_224(pretrained=False, **kwargs):
+    """ R+ViT-Ti/S16 w/ 8x8 patch hybrid @ 224 x 224.
     """
-    backbone = _resnetv2(layers=(3, 4, 9), **kwargs)
-    model_kwargs = dict(embed_dim=768, depth=12, num_heads=12, representation_size=768, **kwargs)
+    backbone = _resnetv2(layers=(), **kwargs)
+    model_kwargs = dict(patch_size=8, embed_dim=192, depth=12, num_heads=3, **kwargs)
     model = _create_vision_transformer_hybrid(
-        'vit_base_r50_s16_224_in21k', backbone=backbone, pretrained=pretrained, **model_kwargs)
+        'vit_tiny_r_s16_p8_224', backbone=backbone, pretrained=pretrained, **model_kwargs)
     return model
 
 
 @register_model
-def vit_base_r50_s16_384(pretrained=False, **kwargs):
-    """ R50+ViT-B/16 hybrid from original paper (https://arxiv.org/abs/2010.11929).
-    ImageNet-1k weights fine-tuned from in21k @ 384x384, source https://github.com/google-research/vision_transformer.
+def vit_tiny_r_s16_p8_384(pretrained=False, **kwargs):
+    """ R+ViT-Ti/S16 w/ 8x8 patch hybrid @ 384 x 384.
     """
-    backbone = _resnetv2((3, 4, 9), **kwargs)
-    model_kwargs = dict(embed_dim=768, depth=12, num_heads=12, **kwargs)
+    backbone = _resnetv2(layers=(), **kwargs)
+    model_kwargs = dict(patch_size=8, embed_dim=192, depth=12, num_heads=3, **kwargs)
     model = _create_vision_transformer_hybrid(
-        'vit_base_r50_s16_384', backbone=backbone, pretrained=pretrained, **model_kwargs)
+        'vit_tiny_r_s16_p8_384', backbone=backbone, pretrained=pretrained, **model_kwargs)
     return model
 
 
 @register_model
-def vit_tiny_r_s16_p8_224(pretrained=False, **kwargs):
-    """ R+ViT-Ti/S16 w/ 8x8 patch hybrid @ 224 x 224.
+def vit_tiny_r_s16_p8_384(pretrained=False, **kwargs):
+    """ R+ViT-Ti/S16 w/ 8x8 patch hybrid @ 384 x 384.
     """
     backbone = _resnetv2(layers=(), **kwargs)
     model_kwargs = dict(patch_size=8, embed_dim=192, depth=12, num_heads=3, **kwargs)
     model = _create_vision_transformer_hybrid(
-        'vit_tiny_r_s16_p8_224', backbone=backbone, pretrained=pretrained, **model_kwargs)
+        'vit_tiny_r_s16_p8_384', backbone=backbone, pretrained=pretrained, **model_kwargs)
     return model
 
 
@@ -212,6 +219,17 @@ def vit_small_r26_s32_224(pretrained=False, **kwargs):
     return model
 
 
+@register_model
+def vit_small_r26_s32_384(pretrained=False, **kwargs):
+    """ R26+ViT-S/S32 hybrid.
+    """
+    backbone = _resnetv2((2, 2, 2, 2), **kwargs)
+    model_kwargs = dict(embed_dim=384, depth=12, num_heads=6, **kwargs)
+    model = _create_vision_transformer_hybrid(
+        'vit_small_r26_s32_384', backbone=backbone, pretrained=pretrained, **model_kwargs)
+    return model
+
+
 @register_model
 def vit_base_r20_s16_224(pretrained=False, **kwargs):
     """ R20+ViT-B/S16 hybrid.
@@ -245,17 +263,74 @@ def vit_base_r50_s16_224(pretrained=False, **kwargs):
     return model
 
 
+@register_model
+def vit_base_r50_s16_384(pretrained=False, **kwargs):
+    """ R50+ViT-B/16 hybrid from original paper (https://arxiv.org/abs/2010.11929).
+    ImageNet-1k weights fine-tuned from in21k @ 384x384, source https://github.com/google-research/vision_transformer.
+    """
+    backbone = _resnetv2((3, 4, 9), **kwargs)
+    model_kwargs = dict(embed_dim=768, depth=12, num_heads=12, **kwargs)
+    model = _create_vision_transformer_hybrid(
+        'vit_base_r50_s16_384', backbone=backbone, pretrained=pretrained, **model_kwargs)
+    return model
+
+
 @register_model
 def vit_large_r50_s32_224(pretrained=False, **kwargs):
     """ R50+ViT-L/S32 hybrid.
     """
     backbone = _resnetv2((3, 4, 6, 3), **kwargs)
-    model_kwargs = dict(embed_dim=768, depth=12, num_heads=12, **kwargs)
+    model_kwargs = dict(embed_dim=1024, depth=24, num_heads=16, **kwargs)
     model = _create_vision_transformer_hybrid(
         'vit_large_r50_s32_224', backbone=backbone, pretrained=pretrained, **model_kwargs)
     return model
 
 
+@register_model
+def vit_large_r50_s32_384(pretrained=False, **kwargs):
+    """ R50+ViT-L/S32 hybrid.
+    """
+    backbone = _resnetv2((3, 4, 6, 3), **kwargs)
+    model_kwargs = dict(embed_dim=1024, depth=24, num_heads=16, **kwargs)
+    model = _create_vision_transformer_hybrid(
+        'vit_large_r50_s32_384', backbone=backbone, pretrained=pretrained, **model_kwargs)
+    return model
+
+
+@register_model
+def vit_small_r26_s32_224_in21k(pretrained=False, **kwargs):
+    """ R26+ViT-S/S32 hybrid.
+    """
+    backbone = _resnetv2((2, 2, 2, 2), **kwargs)
+    model_kwargs = dict(embed_dim=384, depth=12, num_heads=6, **kwargs)
+    model = _create_vision_transformer_hybrid(
+        'vit_small_r26_s32_224_in21k', backbone=backbone, pretrained=pretrained, **model_kwargs)
+    return model
+
+
+@register_model
+def vit_small_r26_s32_384_in21k(pretrained=False, **kwargs):
+    """ R26+ViT-S/S32 hybrid.
+    """
+    backbone = _resnetv2((2, 2, 2, 2), **kwargs)
+    model_kwargs = dict(embed_dim=384, depth=12, num_heads=6, **kwargs)
+    model = _create_vision_transformer_hybrid(
+        'vit_small_r26_s32_384_in21k', backbone=backbone, pretrained=pretrained, **model_kwargs)
+    return model
+
+
+@register_model
+def vit_base_r50_s16_224_in21k(pretrained=False, **kwargs):
+    """ R50+ViT-B/16 hybrid model from original paper (https://arxiv.org/abs/2010.11929).
+    ImageNet-21k weights @ 224x224, source https://github.com/google-research/vision_transformer.
+    """
+    backbone = _resnetv2(layers=(3, 4, 9), **kwargs)
+    model_kwargs = dict(embed_dim=768, depth=12, num_heads=12, representation_size=768, **kwargs)
+    model = _create_vision_transformer_hybrid(
+        'vit_base_r50_s16_224_in21k', backbone=backbone, pretrained=pretrained, **model_kwargs)
+    return model
+
+
 @register_model
 def vit_small_resnet26d_224(pretrained=False, **kwargs):
     """ Custom ViT small hybrid w/ ResNet26D stride 32. No pretrained weights.