Fix issue with nfnet tests, bit more cleanup.

Author: rwightman

tests/test_models.py

@@ -19,7 +19,9 @@
 # exclude models that cause specific test failures
 if 'GITHUB_ACTIONS' in os.environ:  # and 'Linux' in platform.system():
     # GitHub Linux runner is slower and hits memory limits sooner than MacOS, exclude bigger models
-    EXCLUDE_FILTERS = ['*efficientnet_l2*', '*resnext101_32x48d', '*in21k', '*152x4_bitm'] + NON_STD_FILTERS
+    EXCLUDE_FILTERS = [
+        '*efficientnet_l2*', '*resnext101_32x48d', '*in21k', '*152x4_bitm',
+        'nfnet_f4*', 'nfnet_f5*', 'nfnet_f6*', 'nfnet_f7*'] + NON_STD_FILTERS
 else:
     EXCLUDE_FILTERS = NON_STD_FILTERS
 

timm/models/nfnet.py

@@ -3,16 +3,15 @@
 Paper: `Characterizing signal propagation to close the performance gap in unnormalized ResNets`
     - https://arxiv.org/abs/2101.08692
 
-
 Paper: `High-Performance Large-Scale Image Recognition Without Normalization`
     - https://arxiv.org/abs/2102.06171
 
 Official Deepmind JAX code: https://github.com/deepmind/deepmind-research/tree/master/nfnets
 
 Status:
 * These models are a work in progress, experiments ongoing.
-* Two pretrained weights so far, more to come.
-* Model details update to closer match official JAX code now that it's released
+* Pretrained weights for two models so far, more to come.
+* Model details updated to closer match official JAX code now that it's released
 * NF-ResNet, NF-RegNet-B, and NFNet-F models supported
 
 Hacked together by / copyright Ross Wightman, 2021.
@@ -150,7 +149,7 @@ def _nfnet_cfg(depths, act_layer='gelu', attn_layer='se', attn_kwargs=None):
     num_features = channels[-1] * 2
     attn_kwargs = attn_kwargs or dict(reduction_ratio=0.5, divisor=8)
     cfg = NfCfg(
-        depths=depths, channels=channels, stem_type='nff', group_size=128, bottle_ratio=0.5, extra_conv=True,
+        depths=depths, channels=channels, stem_type='deep_quad', group_size=128, bottle_ratio=0.5, extra_conv=True,
         num_features=num_features, act_layer=act_layer, attn_layer=attn_layer, attn_kwargs=attn_kwargs)
     return cfg
 
@@ -176,9 +175,6 @@ def _nfnet_cfg(depths, act_layer='gelu', attn_layer='se', attn_kwargs=None):
     nfnet_f6s=_nfnet_cfg(depths=(7, 14, 42, 21), act_layer='silu'),
     nfnet_f7s=_nfnet_cfg(depths=(8, 16, 48, 24), act_layer='silu'),
 
-    # NFNet-F models w/ SiLU (much faster in PyTorch)
-    # FIXME add remainder if silu vs gelu proves worthwhile
-
     # EffNet influenced RegNet defs.
     # NOTE: These aren't quite the official ver, ch_div=1 must be set for exact ch counts. I round to ch_div=8.
     nf_regnet_b0=_nfreg_cfg(depths=(1, 3, 6, 6)),
@@ -194,9 +190,9 @@ def _nfnet_cfg(depths, act_layer='gelu', attn_layer='se', attn_kwargs=None):
     nf_resnet50=_nfres_cfg(depths=(3, 4, 6, 3)),
     nf_resnet101=_nfres_cfg(depths=(3, 4, 23, 3)),
 
-    nf_seresnet26=_nfres_cfg(depths=(2, 2, 2, 2), attn_layer='se', attn_kwargs=dict(reduction_ratio=0.25)),
-    nf_seresnet50=_nfres_cfg(depths=(3, 4, 6, 3), attn_layer='se', attn_kwargs=dict(reduction_ratio=0.25)),
-    nf_seresnet101=_nfres_cfg(depths=(3, 4, 23, 3), attn_layer='se', attn_kwargs=dict(reduction_ratio=0.25)),
+    nf_seresnet26=_nfres_cfg(depths=(2, 2, 2, 2), attn_layer='se', attn_kwargs=dict(reduction_ratio=1/16)),
+    nf_seresnet50=_nfres_cfg(depths=(3, 4, 6, 3), attn_layer='se', attn_kwargs=dict(reduction_ratio=1/16)),
+    nf_seresnet101=_nfres_cfg(depths=(3, 4, 23, 3), attn_layer='se', attn_kwargs=dict(reduction_ratio=1/16)),
 
     nf_ecaresnet26=_nfres_cfg(depths=(2, 2, 2, 2), attn_layer='eca', attn_kwargs=dict()),
     nf_ecaresnet50=_nfres_cfg(depths=(3, 4, 6, 3), attn_layer='eca', attn_kwargs=dict()),
@@ -315,38 +311,26 @@ def forward(self, x):
         return out
 
 
-def stem_info(stem_type):
-    stem_stride = 2
-    if 'nff' in stem_type or 'pool' in stem_type:
-        stem_stride = 4
-    stem_feat = ''
-    if 'nff' in stem_type:
-        stem_feat = 'stem.act3'
-    elif 'deep' in stem_type and not 'pool' in stem_type:
-        stem_feat = 'stem.act2'
-    return stem_stride, stem_feat
-
-
 def create_stem(in_chs, out_chs, stem_type='', conv_layer=None, act_layer=None):
     stem_stride = 2
-    stem_feature = ''
+    stem_feature = dict(num_chs=out_chs, reduction=2, module='')
     stem = OrderedDict()
-    assert stem_type in ('', 'nff', 'deep', 'deep_tiered', '3x3', '7x7', 'deep_pool', '3x3_pool', '7x7_pool')
+    assert stem_type in ('', 'deep', 'deep_tiered', 'deep_quad', '3x3', '7x7', 'deep_pool', '3x3_pool', '7x7_pool')
     if 'deep' in stem_type or 'nff' in stem_type:
         # 3 deep 3x3  conv stack as in ResNet V1D models. NOTE: doesn't work as well here
-        if 'nff' in stem_type:
+        if 'quad' in stem_type:
             assert not 'pool' in stem_type
             stem_chs = (16, 32, 64, out_chs)
             strides = (2, 1, 1, 2)
             stem_stride = 4
-            stem_feature = 'stem.act4'
+            stem_feature = dict(num_chs=64, reduction=2, module='stem.act4')
         else:
             if 'tiered' in stem_type:
-                stem_chs = (3 * out_chs // 8, out_chs // 2, out_chs)
+                stem_chs = (3 * out_chs // 8, out_chs // 2, out_chs)  # like 'T' resnets in resnet.py
             else:
-                stem_chs = (out_chs // 2, out_chs // 2, out_chs)
+                stem_chs = (out_chs // 2, out_chs // 2, out_chs)  # 'D' ResNets
             strides = (2, 1, 1)
-            stem_feature = 'stem.act3'
+            stem_feature = dict(num_chs=out_chs // 2, reduction=2, module='stem.act3')
         last_idx = len(stem_chs) - 1
         for i, (c, s) in enumerate(zip(stem_chs, strides)):
             stem[f'conv{i+1}'] = conv_layer(in_chs, c, kernel_size=3, stride=s)
@@ -401,7 +385,7 @@ class NormFreeNet(nn.Module):
         * activation correcting gamma constants are moved into the ScaledStdConv as it has less performance
             impact in PyTorch when done with the weight scaling there. This likely wasn't a concern in the JAX impl.
         * a config option `gamma_in_act` can be enabled to not apply gamma in StdConv as described above, but
-            apply it in each activation. This is slightly slower, and yields slightly different results.
+            apply it in each activation. This is slightly slower, numerically different, but matches official impl.
         * skipinit is disabled by default, it seems to have a rather drastic impact on GPU memory use and throughput
             for what it is/does. Approx 8-10% throughput loss.
     """
@@ -424,7 +408,7 @@ def __init__(self, cfg: NfCfg, num_classes=1000, in_chans=3, global_pool='avg',
         self.stem, stem_stride, stem_feat = create_stem(
             in_chans, stem_chs, cfg.stem_type, conv_layer=conv_layer, act_layer=act_layer)
 
-        self.feature_info = [dict(num_chs=stem_chs, reduction=2, module=stem_feat)] if stem_stride == 4 else []
+        self.feature_info = [stem_feat] if stem_stride == 4 else []
         drop_path_rates = [x.tolist() for x in torch.linspace(0, drop_path_rate, sum(cfg.depths)).split(cfg.depths)]
         prev_chs = stem_chs
         net_stride = stem_stride
@@ -476,7 +460,6 @@ def __init__(self, cfg: NfCfg, num_classes=1000, in_chans=3, global_pool='avg',
             # The paper NFRegNet models have an EfficientNet-like final head convolution.
             self.num_features = make_divisible(cfg.width_factor * cfg.num_features, cfg.ch_div)
             self.final_conv = conv_layer(prev_chs, self.num_features, 1)
-            # FIXME not 100% clear on gamma subtleties final conv/final act in case where it's pushed into stdconv
         else:
             self.num_features = prev_chs
             self.final_conv = nn.Identity()
@@ -554,10 +537,12 @@ def nfnet_f3(pretrained=False, **kwargs):
     return _create_normfreenet('nfnet_f3', pretrained=pretrained, **kwargs)
 
 
+@register_model
 def nfnet_f4(pretrained=False, **kwargs):
     return _create_normfreenet('nfnet_f4', pretrained=pretrained, **kwargs)
 
 
+@register_model
 def nfnet_f5(pretrained=False, **kwargs):
     return _create_normfreenet('nfnet_f5', pretrained=pretrained, **kwargs)
 
@@ -567,6 +552,7 @@ def nfnet_f6(pretrained=False, **kwargs):
     return _create_normfreenet('nfnet_f6', pretrained=pretrained, **kwargs)
 
 
+@register_model
 def nfnet_f7(pretrained=False, **kwargs):
     return _create_normfreenet('nfnet_f7', pretrained=pretrained, **kwargs)
 
@@ -591,10 +577,12 @@ def nfnet_f3s(pretrained=False, **kwargs):
     return _create_normfreenet('nfnet_f3s', pretrained=pretrained, **kwargs)
 
 
+@register_model
 def nfnet_f4s(pretrained=False, **kwargs):
     return _create_normfreenet('nfnet_f4s', pretrained=pretrained, **kwargs)
 
 
+@register_model
 def nfnet_f5s(pretrained=False, **kwargs):
     return _create_normfreenet('nfnet_f5s', pretrained=pretrained, **kwargs)
 
@@ -604,6 +592,7 @@ def nfnet_f6s(pretrained=False, **kwargs):
     return _create_normfreenet('nfnet_f6s', pretrained=pretrained, **kwargs)
 
 
+@register_model
 def nfnet_f7s(pretrained=False, **kwargs):
     return _create_normfreenet('nfnet_f7s', pretrained=pretrained, **kwargs)