More models support forward_intermediates

tests/test_models.py

@@ -53,7 +53,10 @@
     'vision_transformer', 'vision_transformer_sam', 'vision_transformer_hybrid', 'vision_transformer_relpos',
     'beit', 'mvitv2', 'eva', 'cait', 'xcit', 'volo', 'twins', 'deit', 'swin_transformer', 'swin_transformer_v2',
     'swin_transformer_v2_cr', 'maxxvit', 'efficientnet', 'mobilenetv3', 'levit', 'efficientformer', 'resnet',
-    'regnet', 'byobnet', 'byoanet', 'mlp_mixer', 'hiera', 'fastvit', 'hieradet_sam2', 'aimv2*'
+    'regnet', 'byobnet', 'byoanet', 'mlp_mixer', 'hiera', 'fastvit', 'hieradet_sam2', 'aimv2*',
+    'tiny_vit', 'vovnet', 'tresnet', 'rexnet', 'resnetv2', 'repghost', 'repvit', 'pvt_v2', 'nextvit', 'nest',
+    'mambaout', 'inception_next', 'inception_v4', 'hgnet', 'gcvit', 'focalnet', 'efficientformer_v2', 'edgenext',
+    'davit', 'rdnet', 'convnext', 'pit'
 ]
 
 # transformer / hybrid models don't support full set of spatial / feature APIs and/or have spatial output.

timm/models/convnext.py

@@ -452,29 +452,29 @@ def forward_intermediates(
         """
         assert output_fmt in ('NCHW',), 'Output shape must be NCHW.'
         intermediates = []
-        take_indices, max_index = feature_take_indices(len(self.stages) + 1, indices)
+        take_indices, max_index = feature_take_indices(len(self.stages), indices)
 
         # forward pass
-        feat_idx = 0  # stem is index 0
         x = self.stem(x)
-        if feat_idx in take_indices:
-            intermediates.append(x)
 
+        last_idx = len(self.stages) - 1
         if torch.jit.is_scripting() or not stop_early:  # can't slice blocks in torchscript
             stages = self.stages
         else:
-            stages = self.stages[:max_index]
-        for stage in stages:
-            feat_idx += 1
+            stages = self.stages[:max_index + 1]
+        for feat_idx, stage in enumerate(stages):
             x = stage(x)
             if feat_idx in take_indices:
-                # NOTE not bothering to apply norm_pre when norm=True as almost no models have it enabled
-                intermediates.append(x)
+                if norm and feat_idx == last_idx:
+                    intermediates.append(self.norm_pre(x))
+                else:
+                    intermediates.append(x)
 
         if intermediates_only:
             return intermediates
 
-        x = self.norm_pre(x)
+        if feat_idx == last_idx:
+            x = self.norm_pre(x)
 
         return x, intermediates
 
@@ -486,8 +486,8 @@ def prune_intermediate_layers(
     ):
         """ Prune layers not required for specified intermediates.
         """
-        take_indices, max_index = feature_take_indices(len(self.stages) + 1, indices)
-        self.stages = self.stages[:max_index]  # truncate blocks w/ stem as idx 0
+        take_indices, max_index = feature_take_indices(len(self.stages), indices)
+        self.stages = self.stages[:max_index + 1]  # truncate blocks w/ stem as idx 0
         if prune_norm:
             self.norm_pre = nn.Identity()
         if prune_head:

timm/models/davit.py

@@ -12,7 +12,7 @@
 # All rights reserved.
 # This source code is licensed under the MIT license
 from functools import partial
-from typing import Optional, Tuple
+from typing import List, Optional, Tuple, Union
 
 import torch
 import torch.nn as nn
@@ -23,6 +23,7 @@
 from timm.layers import DropPath, to_2tuple, trunc_normal_, Mlp, LayerNorm2d, get_norm_layer, use_fused_attn
 from timm.layers import NormMlpClassifierHead, ClassifierHead
 from ._builder import build_model_with_cfg
+from ._features import feature_take_indices
 from ._features_fx import register_notrace_function
 from ._manipulate import checkpoint_seq
 from ._registry import generate_default_cfgs, register_model
@@ -636,6 +637,72 @@ def reset_classifier(self, num_classes: int, global_pool: Optional[str] = None):
         self.num_classes = num_classes
         self.head.reset(num_classes, global_pool)
 
+    def forward_intermediates(
+            self,
+            x: torch.Tensor,
+            indices: Optional[Union[int, List[int]]] = None,
+            norm: bool = False,
+            stop_early: bool = False,
+            output_fmt: str = 'NCHW',
+            intermediates_only: bool = False,
+    ) -> Union[List[torch.Tensor], Tuple[torch.Tensor, List[torch.Tensor]]]:
+        """ Forward features that returns intermediates.
+
+        Args:
+            x: Input image tensor
+            indices: Take last n blocks if int, all if None, select matching indices if sequence
+            norm: Apply norm layer to compatible intermediates
+            stop_early: Stop iterating over blocks when last desired intermediate hit
+            output_fmt: Shape of intermediate feature outputs
+            intermediates_only: Only return intermediate features
+        Returns:
+
+        """
+        assert output_fmt in ('NCHW',), 'Output shape must be NCHW.'
+        intermediates = []
+        take_indices, max_index = feature_take_indices(len(self.stages), indices)
+
+        # forward pass
+        x = self.stem(x)
+        last_idx = len(self.stages) - 1
+        if torch.jit.is_scripting() or not stop_early:  # can't slice blocks in torchscript
+            stages = self.stages
+        else:
+            stages = self.stages[:max_index + 1]
+
+        for feat_idx, stage in enumerate(stages):
+            x = stage(x)
+            if feat_idx in take_indices:
+                if norm and feat_idx == last_idx:
+                    x_inter = self.norm_pre(x)  # applying final norm to last intermediate
+                else:
+                    x_inter = x
+                intermediates.append(x_inter)
+
+        if intermediates_only:
+            return intermediates
+
+        if feat_idx == last_idx:
+            x = self.norm_pre(x)
+
+        return x, intermediates
+
+    def prune_intermediate_layers(
+            self,
+            indices: Union[int, List[int]] = 1,
+            prune_norm: bool = False,
+            prune_head: bool = True,
+    ):
+        """ Prune layers not required for specified intermediates.
+        """
+        take_indices, max_index = feature_take_indices(len(self.stages), indices)
+        self.stages = self.stages[:max_index + 1]  # truncate blocks w/ stem as idx 0
+        if prune_norm:
+            self.norm_pre = nn.Identity()
+        if prune_head:
+            self.reset_classifier(0, '')
+        return take_indices
+
     def forward_features(self, x):
         x = self.stem(x)
         if self.grad_checkpointing and not torch.jit.is_scripting():

timm/models/edgenext.py

@@ -9,7 +9,7 @@
 """
 import math
 from functools import partial
-from typing import Optional, Tuple
+from typing import List, Optional, Tuple, Union
 
 import torch
 import torch.nn.functional as F
@@ -19,6 +19,7 @@
 from timm.layers import trunc_normal_tf_, DropPath, LayerNorm2d, Mlp, create_conv2d, \
     NormMlpClassifierHead, ClassifierHead
 from ._builder import build_model_with_cfg
+from ._features import feature_take_indices
 from ._features_fx import register_notrace_module
 from ._manipulate import named_apply, checkpoint_seq
 from ._registry import register_model, generate_default_cfgs
@@ -418,6 +419,72 @@ def reset_classifier(self, num_classes: int, global_pool: Optional[str] = None):
         self.num_classes = num_classes
         self.head.reset(num_classes, global_pool)
 
+    def forward_intermediates(
+            self,
+            x: torch.Tensor,
+            indices: Optional[Union[int, List[int]]] = None,
+            norm: bool = False,
+            stop_early: bool = False,
+            output_fmt: str = 'NCHW',
+            intermediates_only: bool = False,
+    ) -> Union[List[torch.Tensor], Tuple[torch.Tensor, List[torch.Tensor]]]:
+        """ Forward features that returns intermediates.
+
+        Args:
+            x: Input image tensor
+            indices: Take last n blocks if int, all if None, select matching indices if sequence
+            norm: Apply norm layer to compatible intermediates
+            stop_early: Stop iterating over blocks when last desired intermediate hit
+            output_fmt: Shape of intermediate feature outputs
+            intermediates_only: Only return intermediate features
+        Returns:
+
+        """
+        assert output_fmt in ('NCHW',), 'Output shape must be NCHW.'
+        intermediates = []
+        take_indices, max_index = feature_take_indices(len(self.stages), indices)
+
+        # forward pass
+        x = self.stem(x)
+        last_idx = len(self.stages) - 1
+        if torch.jit.is_scripting() or not stop_early:  # can't slice blocks in torchscript
+            stages = self.stages
+        else:
+            stages = self.stages[:max_index + 1]
+
+        for feat_idx, stage in enumerate(stages):
+            x = stage(x)
+            if feat_idx in take_indices:
+                if norm and feat_idx == last_idx:
+                    x_inter = self.norm_pre(x)  # applying final norm to last intermediate
+                else:
+                    x_inter = x
+                intermediates.append(x_inter)
+
+        if intermediates_only:
+            return intermediates
+
+        if feat_idx == last_idx:
+            x = self.norm_pre(x)
+
+        return x, intermediates
+
+    def prune_intermediate_layers(
+            self,
+            indices: Union[int, List[int]] = 1,
+            prune_norm: bool = False,
+            prune_head: bool = True,
+    ):
+        """ Prune layers not required for specified intermediates.
+        """
+        take_indices, max_index = feature_take_indices(len(self.stages), indices)
+        self.stages = self.stages[:max_index + 1]  # truncate blocks w/ stem as idx 0
+        if prune_norm:
+            self.norm_pre = nn.Identity()
+        if prune_head:
+            self.reset_classifier(0, '')
+        return take_indices
+
     def forward_features(self, x):
         x = self.stem(x)
         x = self.stages(x)

timm/models/efficientformer_v2.py

@@ -16,7 +16,7 @@
 """
 import math
 from functools import partial
-from typing import Dict, Optional
+from typing import Dict, List, Optional, Tuple, Union
 
 import torch
 import torch.nn as nn
@@ -25,6 +25,7 @@
 from timm.layers import create_conv2d, create_norm_layer, get_act_layer, get_norm_layer, ConvNormAct
 from timm.layers import DropPath, trunc_normal_, to_2tuple, to_ntuple, ndgrid
 from ._builder import build_model_with_cfg
+from ._features import feature_take_indices
 from ._manipulate import checkpoint_seq
 from ._registry import generate_default_cfgs, register_model
 
@@ -625,6 +626,73 @@ def reset_classifier(self, num_classes: int, global_pool: Optional[str] = None):
     def set_distilled_training(self, enable=True):
         self.distilled_training = enable
 
+    def forward_intermediates(
+            self,
+            x: torch.Tensor,
+            indices: Optional[Union[int, List[int]]] = None,
+            norm: bool = False,
+            stop_early: bool = False,
+            output_fmt: str = 'NCHW',
+            intermediates_only: bool = False,
+    ) -> Union[List[torch.Tensor], Tuple[torch.Tensor, List[torch.Tensor]]]:
+        """ Forward features that returns intermediates.
+
+        Args:
+            x: Input image tensor
+            indices: Take last n blocks if int, all if None, select matching indices if sequence
+            norm: Apply norm layer to compatible intermediates
+            stop_early: Stop iterating over blocks when last desired intermediate hit
+            output_fmt: Shape of intermediate feature outputs
+            intermediates_only: Only return intermediate features
+        Returns:
+
+        """
+        assert output_fmt in ('NCHW',), 'Output shape must be NCHW.'
+        intermediates = []
+        take_indices, max_index = feature_take_indices(len(self.stages), indices)
+
+        # forward pass
+        x = self.stem(x)
+
+        last_idx = len(self.stages) - 1
+        if torch.jit.is_scripting() or not stop_early:  # can't slice blocks in torchscript
+            stages = self.stages
+        else:
+            stages = self.stages[:max_index + 1]
+
+        for feat_idx, stage in enumerate(stages):
+            x = stage(x)
+            if feat_idx in take_indices:
+                if feat_idx == last_idx:
+                    x_inter = self.norm(x) if norm else x
+                    intermediates.append(x_inter)
+                else:
+                    intermediates.append(x)
+
+        if intermediates_only:
+            return intermediates
+
+        if feat_idx == last_idx:
+            x = self.norm(x)
+
+        return x, intermediates
+
+    def prune_intermediate_layers(
+            self,
+            indices: Union[int, List[int]] = 1,
+            prune_norm: bool = False,
+            prune_head: bool = True,
+    ):
+        """ Prune layers not required for specified intermediates.
+        """
+        take_indices, max_index = feature_take_indices(len(self.stages), indices)
+        self.stages = self.stages[:max_index + 1]  # truncate blocks w/ stem as idx 0
+        if prune_norm:
+            self.norm = nn.Identity()
+        if prune_head:
+            self.reset_classifier(0, '')
+        return take_indices
+
     def forward_features(self, x):
         x = self.stem(x)
         x = self.stages(x)