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Fixing bug on SSD backbone freezing #4590

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Merged
merged 2 commits into from
Oct 11, 2021
Merged

Fixing bug on SSD backbone freezing #4590

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682ebdc
Fixing bug on SSD backbone freezing.
datumbox Oct 11, 2021
4d29aa4
Merge branch 'main' into bug/ssd_backbone_freeze
datumbox Oct 11, 2021
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4 changes: 2 additions & 2 deletions torchvision/models/detection/ssd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -532,7 +532,7 @@ def _vgg_extractor(backbone_name: str, highres: bool, progress: bool, pretrained
backbone = vgg.__dict__[backbone_name](pretrained=pretrained, progress=progress).features

# Gather the indices of maxpools. These are the locations of output blocks.
stage_indices = [i for i, b in enumerate(backbone) if isinstance(b, nn.MaxPool2d)]
stage_indices = [0] + [i for i, b in enumerate(backbone) if isinstance(b, nn.MaxPool2d)][:-1]
num_stages = len(stage_indices)

# find the index of the layer from which we wont freeze
Expand Down Expand Up @@ -602,7 +602,7 @@ def ssd300_vgg16(
warnings.warn("The size of the model is already fixed; ignoring the argument.")

trainable_backbone_layers = _validate_trainable_layers(
pretrained or pretrained_backbone, trainable_backbone_layers, 5, 5
pretrained or pretrained_backbone, trainable_backbone_layers, 5, 4
)

if pretrained:
Expand Down