问题

给当前模型换了个开源的主干网络，并且删除了某些层后，但是发现预训练权重一直加载不上。strict为True时加载报错，strict为False时又什么都加载不上，然后不知道哪里出问题了。

解决

当strict为False时，load_state_dict函数会返回一个字典，该字典含有以下两个键：

missing_keys：在当前模型中存在，但在预训练权重中不存在的键。
unexpected_keys：在当前模型不存在，但在预训练权重中存在的键。

        result=self.backbone.load_state_dict(model_weight,strict=False)
        print("Missing keys:", result.missing_keys)
        print("Unexpected keys:", result.unexpected_keys)

得到输出:

Missing keys: ['model.patch_embed.conv1.weight', 'model.patch_embed.conv1.bias', 'model.patch_embed.norm1.1.weight', 'model.patch_embed.norm1.1.bias', 'model.patch_embed.conv2.weight', 'model.patch_embed.conv2.bias', 'model.patch_embed.norm2.1.weight', 'model.patch_embed.norm2.1.bias', 'model.levels.0.blocks.0.norm1.0.weight', 'model.levels.0.blocks.0.norm1.0.bias', 'model.levels.0.blocks.0.dcn.offset_mask.weight', 'model.levels.0.blocks.0.dcn.offset_mask.bias', 'model.levels.0.blocks.0.dcn.value_proj.weight', 'model.levels.0.blocks.0.dcn.value_proj.bias', 'model.levels.0.blocks.0.dcn.output_proj.weight', 'model.levels.0.blocks.0.norm2.0.weight', 'model.levels.0.blocks.0.norm2.0.bias', 'model.levels.0.blocks.0.mlp.fc1.weight', 'model.levels.0.blocks.0.mlp.fc1.bias', 'model.levels.0.blocks.0.mlp.fc2.weight', 'model.levels.0.blocks.1.norm1.0.weight', 'model.levels.0.blocks.1.norm1.0.bias', 'model.levels.0.blocks.1.dcn.offset_mask.weight', 'model.levels.0.blocks.1.dcn.offset_mask.bias', 'model.levels.0.blocks.1.dcn.value_proj.weight', 'model.levels.0.blocks.1.dcn.value_proj.bias', 'model.levels.0.blocks.1.dcn.output_proj.weight', 'model.levels.0.blocks.1.norm2.0.weight', 'model.levels.0.blocks.1.norm2.0.bias', 'model.levels.0.blocks.1.mlp.fc1.weight', 'model.levels.0.blocks.1.mlp.fc1.bias', 'model.levels.0.blocks.1.mlp.fc2.weight', 'model.levels.0.blocks.2.norm1.0.weight', 'model.levels.0.blocks.2.norm1.0.bias', 'model.levels.0.blocks.2.dcn.offset_mask.weight', 'model.levels.0.blocks.2.dcn.offset_mask.bias', 'model.levels.0.blocks.2.dcn.value_proj.weight', 'model.levels.0.blocks.2.dcn.value_proj.bias', 'model.levels.0.blocks.2.dcn.output_proj.weight', 'model.levels.0.blocks.2.norm2.0.weight', 'model.levels.0.blocks.2.norm2.0.bias', 'model.levels.0.blocks.2.mlp.fc1.weight', 'model.levels.0.blocks.2.mlp.fc1.bias', 'model.levels.0.blocks.2.mlp.fc2.weight', 'model.levels.0.blocks.3.norm1.0.weight', 'model.levels.0.blocks.3.norm1.0.bias', 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'levels.3.blocks.2.dcn.offset_mask.bias', 'levels.3.blocks.2.dcn.value_proj.weight', 'levels.3.blocks.2.dcn.value_proj.bias', 'levels.3.blocks.2.dcn.output_proj.weight', 'levels.3.blocks.2.norm2.0.weight', 'levels.3.blocks.2.norm2.0.bias', 'levels.3.blocks.2.mlp.fc1.weight', 'levels.3.blocks.2.mlp.fc1.bias', 'levels.3.blocks.2.mlp.fc2.weight', 'levels.3.blocks.3.norm1.0.weight', 'levels.3.blocks.3.norm1.0.bias', 'levels.3.blocks.3.dcn.offset_mask.weight', 'levels.3.blocks.3.dcn.offset_mask.bias', 'levels.3.blocks.3.dcn.value_proj.weight', 'levels.3.blocks.3.dcn.value_proj.bias', 'levels.3.blocks.3.dcn.output_proj.weight', 'levels.3.blocks.3.norm2.0.weight', 'levels.3.blocks.3.norm2.0.bias', 'levels.3.blocks.3.mlp.fc1.weight', 'levels.3.blocks.3.mlp.fc1.bias', 'levels.3.blocks.3.mlp.fc2.weight', 'levels.3.norm.0.weight', 'levels.3.norm.0.bias', 'conv_head.0.weight', 'conv_head.1.0.weight', 'conv_head.1.0.bias', 'conv_head.1.0.running_mean', 'conv_head.1.0.running_var', 'conv_head.1.0.num_batches_tracked', 'head.weight', 'head.bias']

可以看到，我的模型的名字每一层都比预训练的权重多了一个’model.'，这就导致了无法加载权重。
于是就把预训练的权重的键名加上‘model.’即可。

        model_weight= {'model.' + key: value for key, value in model_weight.items()}

然后重新调试，可以看到输出：

Missing keys: []
Unexpected keys: ['model.head.weight', 'model.head.bias']

可以看到Missing keys为空，所以需要的权重全部加载了。