Merge branch 'master' of https://github.com/alexander-soare/pytorch-image-models into alexander-soare-master

timm/models/tnt.py

@@ -14,7 +14,9 @@ from functools import partial
 from timm.data import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
 from timm.models.helpers import load_pretrained
 from timm.models.layers import Mlp, DropPath, trunc_normal_
+from timm.models.layers.helpers import to_2tuple
 from timm.models.registry import register_model
+from timm.models.vision_transformer import resize_pos_embed
 
 
 def _cfg(url='', **kwargs):
@@ -118,11 +120,15 @@ class PixelEmbed(nn.Module):
     """
     def __init__(self, img_size=224, patch_size=16, in_chans=3, in_dim=48, stride=4):
         super().__init__()
-        num_patches = (img_size // patch_size) ** 2
+        img_size = to_2tuple(img_size)
+        patch_size = to_2tuple(patch_size)
+        # grid_size property necessary for resizing positional embedding
+        self.grid_size = (img_size[0] // patch_size[0], img_size[1] // patch_size[1])
+        num_patches = (self.grid_size[0]) * (self.grid_size[1])
         self.img_size = img_size
         self.num_patches = num_patches
         self.in_dim = in_dim
-        new_patch_size = math.ceil(patch_size / stride)
+        new_patch_size = [math.ceil(ps / stride) for ps in patch_size]
         self.new_patch_size = new_patch_size
 
         self.proj = nn.Conv2d(in_chans, self.in_dim, kernel_size=7, padding=3, stride=stride)
@@ -130,11 +136,11 @@ class PixelEmbed(nn.Module):
 
     def forward(self, x, pixel_pos):
         B, C, H, W = x.shape
-        assert H == self.img_size and W == self.img_size, \
-            f"Input image size ({H}*{W}) doesn't match model ({self.img_size}*{self.img_size})."
+        assert H == self.img_size[0] and W == self.img_size[1], \
+            f"Input image size ({H}*{W}) doesn't match model ({self.img_size[0]}*{self.img_size[1]})."
         x = self.proj(x)
         x = self.unfold(x)
-        x = x.transpose(1, 2).reshape(B * self.num_patches, self.in_dim, self.new_patch_size, self.new_patch_size)
+        x = x.transpose(1, 2).reshape(B * self.num_patches, self.in_dim, self.new_patch_size[0], self.new_patch_size[1])
         x = x + pixel_pos
         x = x.reshape(B * self.num_patches, self.in_dim, -1).transpose(1, 2)
         return x
@@ -155,7 +161,7 @@ class TNT(nn.Module):
         num_patches = self.pixel_embed.num_patches
         self.num_patches = num_patches
         new_patch_size = self.pixel_embed.new_patch_size
-        num_pixel = new_patch_size ** 2
+        num_pixel = new_patch_size[0] * new_patch_size[1]
         
         self.norm1_proj = norm_layer(num_pixel * in_dim)
         self.proj = nn.Linear(num_pixel * in_dim, embed_dim)
@@ -163,7 +169,7 @@ class TNT(nn.Module):
 
         self.cls_token = nn.Parameter(torch.zeros(1, 1, embed_dim))
         self.patch_pos = nn.Parameter(torch.zeros(1, num_patches + 1, embed_dim))
-        self.pixel_pos = nn.Parameter(torch.zeros(1, in_dim, new_patch_size, new_patch_size))
+        self.pixel_pos = nn.Parameter(torch.zeros(1, in_dim, new_patch_size[0], new_patch_size[1]))
         self.pos_drop = nn.Dropout(p=drop_rate)
 
         dpr = [x.item() for x in torch.linspace(0, drop_path_rate, depth)]  # stochastic depth decay rule
@@ -224,6 +230,14 @@ class TNT(nn.Module):
         return x
 
 
+def checkpoint_filter_fn(state_dict, model):
+    """ convert patch embedding weight from manual patchify + linear proj to conv"""
+    if state_dict['patch_pos'].shape != model.patch_pos.shape:
+        state_dict['patch_pos'] = resize_pos_embed(state_dict['patch_pos'],
+            model.patch_pos, getattr(model, 'num_tokens', 1), model.pixel_embed.grid_size)
+    return state_dict
+
+
 @register_model
 def tnt_s_patch16_224(pretrained=False, **kwargs):
     model = TNT(patch_size=16, embed_dim=384, in_dim=24, depth=12, num_heads=6, in_num_head=4,
@@ -231,7 +245,8 @@ def tnt_s_patch16_224(pretrained=False, **kwargs):
     model.default_cfg = default_cfgs['tnt_s_patch16_224']
     if pretrained:
         load_pretrained(
-            model, num_classes=model.num_classes, in_chans=kwargs.get('in_chans', 3))
+            model, num_classes=model.num_classes, in_chans=kwargs.get('in_chans', 3),
+                filter_fn=checkpoint_filter_fn)
     return model
 
 

timm/models/vision_transformer.py

@@ -352,7 +352,7 @@ def _init_vit_weights(m, n: str = '', head_bias: float = 0., jax_impl: bool = Fa
         nn.init.ones_(m.weight)
 
 
-def resize_pos_embed(posemb, posemb_new, num_tokens=1):
+def resize_pos_embed(posemb, posemb_new, num_tokens=1, gs_new=[]):
     # Rescale the grid of position embeddings when loading from state_dict. Adapted from
     # https://github.com/google-research/vision_transformer/blob/00883dd691c63a6830751563748663526e811cee/vit_jax/checkpoint.py#L224
     _logger.info('Resized position embedding: %s to %s', posemb.shape, posemb_new.shape)
@@ -363,11 +363,12 @@ def resize_pos_embed(posemb, posemb_new, num_tokens=1):
     else:
         posemb_tok, posemb_grid = posemb[:, :0], posemb[0]
     gs_old = int(math.sqrt(len(posemb_grid)))
-    gs_new = int(math.sqrt(ntok_new))
-    _logger.info('Position embedding grid-size from %s to %s', gs_old, gs_new)
+    if not len(gs_new): # backwards compatibility
+        gs_new = [int(math.sqrt(ntok_new))]*2
+    _logger.info('Position embedding grid-size from %s to %s', [gs_old, gs_old], gs_new)
     posemb_grid = posemb_grid.reshape(1, gs_old, gs_old, -1).permute(0, 3, 1, 2)
-    posemb_grid = F.interpolate(posemb_grid, size=(gs_new, gs_new), mode='bilinear')
-    posemb_grid = posemb_grid.permute(0, 2, 3, 1).reshape(1, gs_new * gs_new, -1)
+    posemb_grid = F.interpolate(posemb_grid, size=gs_new, mode='bilinear')
+    posemb_grid = posemb_grid.permute(0, 2, 3, 1).reshape(1, gs_new[0] * gs_new[1], -1)
     posemb = torch.cat([posemb_tok, posemb_grid], dim=1)
     return posemb
 
@@ -385,7 +386,8 @@ def checkpoint_filter_fn(state_dict, model):
             v = v.reshape(O, -1, H, W)
         elif k == 'pos_embed' and v.shape != model.pos_embed.shape:
             # To resize pos embedding when using model at different size from pretrained weights
-            v = resize_pos_embed(v, model.pos_embed, getattr(model, 'num_tokens', 1))
+            v = resize_pos_embed(v, model.pos_embed, getattr(model, 'num_tokens', 1),
+                                                model.patch_embed.grid_size)
         out_dict[k] = v
     return out_dict