目录

1--前言

2--问题描述

2--代码

3--测试

1--前言

        最近复现一篇 Paper，需要使用预训练的模型，但预训练模型和自定义模型的 key 值不匹配，导致无法顺利加载预训练权重文件；

2--问题描述

        需要使用的预训练模型如下：

import torch

if __name__ == "__main__":
 
    weights_files = './joint_model_stgcn.pt' # 权重文件路径
    weights = torch.load(weights_files) # 加载权重文件
    
    for k, v in weights.items(): # key, value
        print(k)  # 打印 key（参数名）

        原权重文件的 key 值如下：

A
...
st_gcn_networks.9.gcn.conv.weight
st_gcn_networks.9.gcn.conv.bias
st_gcn_networks.9.tcn.0.weight
st_gcn_networks.9.tcn.0.bias
st_gcn_networks.9.tcn.0.running_mean
st_gcn_networks.9.tcn.0.running_var
st_gcn_networks.9.tcn.0.num_batches_tracked
st_gcn_networks.9.tcn.2.weight
st_gcn_networks.9.tcn.2.bias
st_gcn_networks.9.tcn.3.weight
st_gcn_networks.9.tcn.3.bias
st_gcn_networks.9.tcn.3.running_mean
st_gcn_networks.9.tcn.3.running_var
st_gcn_networks.9.tcn.3.num_batches_tracked
edge_importance.0
edge_importance.1
edge_importance.2
edge_importance.3
edge_importance.4
edge_importance.5
edge_importance.6
edge_importance.7
edge_importance.8
edge_importance.9
fcn.weight
fcn.bias

        需求是修改以下 key 值，以适配自定义模型：

edge_importance.0 -> edge_importance0
edge_importance.1 -> edge_importance1
edge_importance.2 -> edge_importance2
edge_importance.3 -> edge_importance3
edge_importance.4 -> edge_importance4
edge_importance.5 -> edge_importance5
edge_importance.6 -> edge_importance6
edge_importance.7 -> edge_importance7
edge_importance.8 -> edge_importance8
edge_importance.9 -> edge_importance9

2--代码

        基于原权重文件，利用 collections.OrderedDict() 创建新的权重文件：

import torch
import collections

if __name__ == "__main__":
    # 加载原权重文件
    weights_files = './joint_model_stgcn.pt'
    weights = torch.load(weights_files)
    # 修改
    new_d = weights
    for i in range(10):
        new_d = collections.OrderedDict([('edge_importance'+str(i), v) if k == 'edge_importance.'+str(i) else (k, v) for k, v in new_d.items()])
    # 测试
    for k, v in new_d.items(): # key, value
        print(k)  # 打印参数名
    # 保存
    torch.save(new_d, 'new_joint_model_stgcn.pt')

        修改后的 key 值：

A
...
st_gcn_networks.9.gcn.conv.weight
st_gcn_networks.9.gcn.conv.bias
st_gcn_networks.9.tcn.0.weight
st_gcn_networks.9.tcn.0.bias
st_gcn_networks.9.tcn.0.running_mean
st_gcn_networks.9.tcn.0.running_var
st_gcn_networks.9.tcn.0.num_batches_tracked
st_gcn_networks.9.tcn.2.weight
st_gcn_networks.9.tcn.2.bias
st_gcn_networks.9.tcn.3.weight
st_gcn_networks.9.tcn.3.bias
st_gcn_networks.9.tcn.3.running_mean
st_gcn_networks.9.tcn.3.running_var
st_gcn_networks.9.tcn.3.num_batches_tracked
edge_importance0
edge_importance1
edge_importance2
edge_importance3
edge_importance4
edge_importance5
edge_importance6
edge_importance7
edge_importance8
edge_importance9
fcn.weight
fcn.bias

3--测试

        测试原权重文件和新权重文件的 value 是否相同：

import torch

if __name__ == "__main__":
 
    origin_weights_files = './joint_model_stgcn.pt'
    origin_weights = torch.load(origin_weights_files)
    new_weights_files = './new_joint_model_stgcn.pt'
    new_weights = torch.load(new_weights_files)

    print(origin_weights['A'] == new_weights['A'])
    print(origin_weights['edge_importance.0'] == new_weights['edge_importance0'])