Update EfficientNet feature extraction for EfficientDet. Add needed MaxPoolSame as well.

Author: rwightman

timm/models/efficientnet.py

@@ -326,7 +326,6 @@ def __init__(self, block_args, num_classes=1000, num_features=1280, in_chans=3,
         # Stem
         if not fix_stem:
             stem_size = round_channels(stem_size, channel_multiplier, channel_divisor, channel_min)
-        print(stem_size)
         self.conv_stem = create_conv2d(self._in_chs, stem_size, 3, stride=2, padding=pad_type)
         self.bn1 = norm_layer(stem_size, **norm_kwargs)
         self.act1 = act_layer(inplace=True)
@@ -393,7 +392,7 @@ class EfficientNetFeatures(nn.Module):
     and object detection models.
     """
 
-    def __init__(self, block_args, out_indices=(0, 1, 2, 3, 4), feature_location='pre_pwl',
+    def __init__(self, block_args, out_indices=(0, 1, 2, 3, 4), feature_location='bottleneck',
                  in_chans=3, stem_size=32, channel_multiplier=1.0, channel_divisor=8, channel_min=None,
                  output_stride=32, pad_type='', fix_stem=False, act_layer=nn.ReLU, drop_rate=0., drop_path_rate=0.,
                  se_kwargs=None, norm_layer=nn.BatchNorm2d, norm_kwargs=None):
@@ -404,6 +403,7 @@ def __init__(self, block_args, out_indices=(0, 1, 2, 3, 4), feature_location='pr
         num_stages = max(out_indices) + 1
 
         self.out_indices = out_indices
+        self.feature_location = feature_location
         self.drop_rate = drop_rate
         self._in_chs = in_chans
 
@@ -420,34 +420,56 @@ def __init__(self, block_args, out_indices=(0, 1, 2, 3, 4), feature_location='pr
             channel_multiplier, channel_divisor, channel_min, output_stride, pad_type, act_layer, se_kwargs,
             norm_layer, norm_kwargs, drop_path_rate, feature_location=feature_location, verbose=_DEBUG)
         self.blocks = nn.Sequential(*builder(self._in_chs, block_args))
-        self.feature_info = builder.features  # builder provides info about feature channels for each block
+        self._feature_info = builder.features  # builder provides info about feature channels for each block
+        self._stage_to_feature_idx = {
+            v['stage_idx']: fi for fi, v in self._feature_info.items() if fi in self.out_indices}
         self._in_chs = builder.in_chs
 
         efficientnet_init_weights(self)
         if _DEBUG:
-            for k, v in self.feature_info.items():
+            for k, v in self._feature_info.items():
                 print('Feature idx: {}: Name: {}, Channels: {}'.format(k, v['name'], v['num_chs']))
 
         # Register feature extraction hooks with FeatureHooks helper
-        hook_type = 'forward_pre' if feature_location == 'pre_pwl' else 'forward'
-        hooks = [dict(name=self.feature_info[idx]['name'], type=hook_type) for idx in out_indices]
-        self.feature_hooks = FeatureHooks(hooks, self.named_modules())
+        self.feature_hooks = None
+        if feature_location != 'bottleneck':
+            hooks = [dict(
+                name=self._feature_info[idx]['module'],
+                type=self._feature_info[idx]['hook_type']) for idx in out_indices]
+            self.feature_hooks = FeatureHooks(hooks, self.named_modules())
 
     def feature_channels(self, idx=None):
         """ Feature Channel Shortcut
         Returns feature channel count for each output index if idx == None. If idx is an integer, will
         return feature channel count for that feature block index (independent of out_indices setting).
         """
         if isinstance(idx, int):
-            return self.feature_info[idx]['num_chs']
-        return [self.feature_info[i]['num_chs'] for i in self.out_indices]
+            return self._feature_info[idx]['num_chs']
+        return [self._feature_info[i]['num_chs'] for i in self.out_indices]
+
+    def feature_info(self, idx=None):
+        """ Feature Channel Shortcut
+        Returns feature channel count for each output index if idx == None. If idx is an integer, will
+        return feature channel count for that feature block index (independent of out_indices setting).
+        """
+        if isinstance(idx, int):
+            return self._feature_info[idx]
+        return [self._feature_info[i] for i in self.out_indices]
 
     def forward(self, x):
         x = self.conv_stem(x)
         x = self.bn1(x)
         x = self.act1(x)
-        self.blocks(x)
-        return self.feature_hooks.get_output(x.device)
+        if self.feature_hooks is None:
+            features = []
+            for i, b in enumerate(self.blocks):
+                x = b(x)
+                if i in self._stage_to_feature_idx:
+                    features.append(x)
+            return features
+        else:
+            self.blocks(x)
+            return self.feature_hooks.get_output(x.device)
 
 
 def _create_model(model_kwargs, default_cfg, pretrained=False):

timm/models/efficientnet_blocks.py

@@ -120,11 +120,13 @@ def __init__(self, in_chs, out_chs, kernel_size,
         self.bn1 = norm_layer(out_chs, **norm_kwargs)
         self.act1 = act_layer(inplace=True)
 
-    def feature_module(self, location):
-        return 'act1'
-
-    def feature_channels(self, location):
-        return self.conv.out_channels
+    def feature_info(self, location):
+        if location == 'expansion' or location == 'depthwise':
+            # no expansion or depthwise this block, use act after conv
+            info = dict(module='act1', hook_type='forward', num_chs=self.conv.out_channels)
+        else:  # location == 'bottleneck'
+            info = dict(module='', hook_type='', num_chs=self.conv.out_channels)
+        return info
 
     def forward(self, x):
         x = self.conv(x)
@@ -165,12 +167,15 @@ def __init__(self, in_chs, out_chs, dw_kernel_size=3,
         self.bn2 = norm_layer(out_chs, **norm_kwargs)
         self.act2 = act_layer(inplace=True) if self.has_pw_act else nn.Identity()
 
-    def feature_module(self, location):
-        # no expansion in this block, pre pw only feature extraction point
-        return 'conv_pw'
-
-    def feature_channels(self, location):
-        return self.conv_pw.in_channels
+    def feature_info(self, location):
+        if location == 'expansion':
+            # no expansion in this block, use depthwise, before SE
+            info = dict(module='act1', hook_type='forward', num_chs=self.conv_pw.in_channels)
+        elif location == 'depthwise':  # after SE
+            info = dict(module='conv_pw', hook_type='forward_pre', num_chs=self.conv_pw.in_channels)
+        else:  # location == 'bottleneck'
+            info = dict(module='', hook_type='', num_chs=self.conv_pw.out_channels)
+        return info
 
     def forward(self, x):
         residual = x
@@ -232,16 +237,14 @@ def __init__(self, in_chs, out_chs, dw_kernel_size=3,
         self.conv_pwl = create_conv2d(mid_chs, out_chs, pw_kernel_size, padding=pad_type, **conv_kwargs)
         self.bn3 = norm_layer(out_chs, **norm_kwargs)
 
-    def feature_module(self, location):
-        if location == 'post_exp':
-            return 'act1'
-        return 'conv_pwl'
-
-    def feature_channels(self, location):
-        if location == 'post_exp':
-            return self.conv_pw.out_channels
-        # location == 'pre_pw'
-        return self.conv_pwl.in_channels
+    def feature_info(self, location):
+        if location == 'expansion':
+            info = dict(module='act1', hook_type='forward', num_chs=self.conv_pw.in_channels)
+        elif location == 'depthwise':  # after SE
+            info = dict(module='conv_pwl', hook_type='forward_pre', num_chs=self.conv_pwl.in_channels)
+        else:  # location == 'bottleneck'
+            info = dict(module='', hook_type='', num_chs=self.conv_pwl.out_channels)
+        return info
 
     def forward(self, x):
         residual = x
@@ -359,16 +362,15 @@ def __init__(self, in_chs, out_chs, exp_kernel_size=3, exp_ratio=1.0, fake_in_ch
             mid_chs, out_chs, pw_kernel_size, stride=stride, dilation=dilation, padding=pad_type)
         self.bn2 = norm_layer(out_chs, **norm_kwargs)
 
-    def feature_module(self, location):
-        if location == 'post_exp':
-            return 'act1'
-        return 'conv_pwl'
-
-    def feature_channels(self, location):
-        if location == 'post_exp':
-            return self.conv_exp.out_channels
-        # location == 'pre_pw'
-        return self.conv_pwl.in_channels
+    def feature_info(self, location):
+        if location == 'expansion':
+            info = dict(module='act1', hook_type='forward', num_chs=self.conv_exp.out_channels)
+        elif location == 'depthwise':
+            # there is no depthwise, take after SE, before PWL
+            info = dict(module='conv_pwl', hook_type='forward_pre', num_chs=self.conv_pwl.in_channels)
+        else:  # location == 'bottleneck'
+            info = dict(module='', hook_type='', num_chs=self.conv_pwl.out_channels)
+        return info
 
     def forward(self, x):
         residual = x

timm/models/efficientnet_builder.py

@@ -218,7 +218,7 @@ def __init__(self, channel_multiplier=1.0, channel_divisor=8, channel_min=None,
         self.norm_kwargs = norm_kwargs
         self.drop_path_rate = drop_path_rate
         self.feature_location = feature_location
-        assert feature_location in ('pre_pwl', 'post_exp', '')
+        assert feature_location in ('bottleneck', 'depthwise', 'expansion', '')
         self.verbose = verbose
 
         # state updated during build, consumed by model
@@ -313,20 +313,21 @@ def __call__(self, in_chs, model_block_args):
                     block_args['stride'] = 1
 
                 do_extract = False
-                if self.feature_location == 'pre_pwl':
+                if self.feature_location == 'bottleneck' or self.feature_location == 'depthwise':
                     if last_block:
                         next_stage_idx = stage_idx + 1
                         if next_stage_idx >= len(model_block_args):
                             do_extract = True
                         else:
                             do_extract = model_block_args[next_stage_idx][0]['stride'] > 1
-                elif self.feature_location == 'post_exp':
-                    if block_args['stride'] > 1 or (last_stack and last_block) :
+                elif self.feature_location == 'expansion':
+                    if block_args['stride'] > 1 or (last_stack and last_block):
                         do_extract = True
                 if do_extract:
                     extract_features = self.feature_location
 
                 next_dilation = current_dilation
+                next_output_stride = current_stride
                 if block_args['stride'] > 1:
                     next_output_stride = current_stride * block_args['stride']
                     if next_output_stride > self.output_stride:
@@ -347,14 +348,13 @@ def __call__(self, in_chs, model_block_args):
 
                 # stash feature module name and channel info for model feature extraction
                 if extract_features:
-                    feature_module = block.feature_module(extract_features)
-                    if feature_module:
-                        feature_module = 'blocks.{}.{}.'.format(stage_idx, block_idx) + feature_module
-                    feature_channels = block.feature_channels(extract_features)
-                    self.features[feature_idx] = dict(
-                        name=feature_module,
-                        num_chs=feature_channels
-                    )
+                    feature_info = block.feature_info(extract_features)
+                    if feature_info['module']:
+                        feature_info['module'] = 'blocks.{}.{}.'.format(stage_idx, block_idx) + feature_info['module']
+                    feature_info['stage_idx'] = stage_idx
+                    feature_info['block_idx'] = block_idx
+                    feature_info['reduction'] = current_stride
+                    self.features[feature_idx] = feature_info
                     feature_idx += 1
 
                 total_block_idx += 1  # incr global block idx (across all stacks)

timm/models/layers/__init__.py

@@ -1,9 +1,10 @@
 from .padding import get_padding
-from .avg_pool2d_same import AvgPool2dSame
+from .pool2d_same import AvgPool2dSame
 from .conv2d_same import Conv2dSame
 from .conv_bn_act import ConvBnAct
 from .mixed_conv2d import MixedConv2d
 from .cond_conv2d import CondConv2d, get_condconv_initializer
+from .pool2d_same import create_pool2d
 from .create_conv2d import create_conv2d
 from .create_attn import create_attn
 from .selective_kernel import SelectiveKernelConv

timm/models/layers/avg_pool2d_same.py

@@ -14,7 +14,8 @@
 from torch.nn import functional as F
 
 from .helpers import tup_pair
-from .conv2d_same import get_padding_value, conv2d_same
+from .conv2d_same import conv2d_same
+from timm.models.layers.padding import get_padding_value
 
 
 def get_condconv_initializer(initializer, num_experts, expert_shape):

timm/models/layers/cond_conv2d.py

@@ -5,10 +5,10 @@
 import torch
 import torch.nn as nn
 import torch.nn.functional as F
-from typing import Union, List, Tuple, Optional, Callable
-import math
+from typing import Tuple, Optional
 
-from .padding import get_padding, pad_same, is_static_pad
+from timm.models.layers.padding import get_padding_value
+from .padding import pad_same
 
 
 def conv2d_same(
@@ -31,29 +31,6 @@ def forward(self, x):
         return conv2d_same(x, self.weight, self.bias, self.stride, self.padding, self.dilation, self.groups)
 
 
-def get_padding_value(padding, kernel_size, **kwargs) -> Tuple[Tuple, bool]:
-    dynamic = False
-    if isinstance(padding, str):
-        # for any string padding, the padding will be calculated for you, one of three ways
-        padding = padding.lower()
-        if padding == 'same':
-            # TF compatible 'SAME' padding, has a performance and GPU memory allocation impact
-            if is_static_pad(kernel_size, **kwargs):
-                # static case, no extra overhead
-                padding = get_padding(kernel_size, **kwargs)
-            else:
-                # dynamic 'SAME' padding, has runtime/GPU memory overhead
-                padding = 0
-                dynamic = True
-        elif padding == 'valid':
-            # 'VALID' padding, same as padding=0
-            padding = 0
-        else:
-            # Default to PyTorch style 'same'-ish symmetric padding
-            padding = get_padding(kernel_size, **kwargs)
-    return padding, dynamic
-
-
 def create_conv2d_pad(in_chs, out_chs, kernel_size, **kwargs):
     padding = kwargs.pop('padding', '')
     kwargs.setdefault('bias', False)

timm/models/layers/conv2d_same.py

@@ -3,7 +3,7 @@
 Hacked together by Ross Wightman
 """
 import math
-from typing import List
+from typing import List, Tuple
 
 import torch.nn.functional as F
 
@@ -25,9 +25,32 @@ def is_static_pad(kernel_size: int, stride: int = 1, dilation: int = 1, **_):
 
 
 # Dynamically pad input x with 'SAME' padding for conv with specified args
-def pad_same(x, k: List[int], s: List[int], d: List[int] = (1, 1)):
+def pad_same(x, k: List[int], s: List[int], d: List[int] = (1, 1), value: float = 0):
     ih, iw = x.size()[-2:]
     pad_h, pad_w = get_same_padding(ih, k[0], s[0], d[0]), get_same_padding(iw, k[1], s[1], d[1])
     if pad_h > 0 or pad_w > 0:
-        x = F.pad(x, [pad_w // 2, pad_w - pad_w // 2, pad_h // 2, pad_h - pad_h // 2])
+        x = F.pad(x, [pad_w // 2, pad_w - pad_w // 2, pad_h // 2, pad_h - pad_h // 2], value=value)
     return x
+
+
+def get_padding_value(padding, kernel_size, **kwargs) -> Tuple[Tuple, bool]:
+    dynamic = False
+    if isinstance(padding, str):
+        # for any string padding, the padding will be calculated for you, one of three ways
+        padding = padding.lower()
+        if padding == 'same':
+            # TF compatible 'SAME' padding, has a performance and GPU memory allocation impact
+            if is_static_pad(kernel_size, **kwargs):
+                # static case, no extra overhead
+                padding = get_padding(kernel_size, **kwargs)
+            else:
+                # dynamic 'SAME' padding, has runtime/GPU memory overhead
+                padding = 0
+                dynamic = True
+        elif padding == 'valid':
+            # 'VALID' padding, same as padding=0
+            padding = 0
+        else:
+            # Default to PyTorch style 'same'-ish symmetric padding
+            padding = get_padding(kernel_size, **kwargs)
+    return padding, dynamic