tf预训练模型转换为torch预训练模型

た入场券 2022-11-11 05:51 230阅读 0赞

**在将albert的tensorflow预训练模型转换为 torch类型预训练模型，踩了很多坑。终于解决，希望对大家有用**

1.  **前期准备**  
    创建一个环境带有torch和tf的环境，步骤如下：  
    首先创建环境  
    `python conda create -n torchtf_env python=3.7`  
    然后，安装torch（根据自己电脑的cuda安装）  
    `python conda install pytorch torchvision torchaudio cudatoolkit=11.1 -c pytorch -c conda-forge`  
    之后，继续安装tensorflow-gpu版本  
    `python conda install tensorflow-gpu==1.15`  
    最后安装transformers  
    pip install transformers

2 .**从github上下载tensorflow预训练的albert版本**

#! usr/bin/env python3
    # -*- coding:utf-8 -*-
    """ Created on 19/03/2021 20:22 @Author: lixj """
    
    from __future__ import absolute_import
    from __future__ import division
    from __future__ import print_function
    
    import argparse
    import torch
    from transformers import AlbertConfig, AlbertForPreTraining, load_tf_weights_in_albert
    import logging
    logging.basicConfig(level=logging.INFO)
    
    def convert_tf_checkpoint_to_pytorch(tf_checkpoint_path, bert_config_file, pytorch_dump_path):
        # Initialise PyTorch model
        config = AlbertConfig.from_pretrained(bert_config_file)
        # print("Building PyTorch model from configuration: {}".format(str(config)))
        model = AlbertForPreTraining(config)
        # Load weights from tf checkpoint
        load_tf_weights_in_albert(model, config, tf_checkpoint_path)
    
        # Save pytorch-model
        print("Save PyTorch model to {}".format(pytorch_dump_path))
        torch.save(model.state_dict(), pytorch_dump_path)
    
    
    
    if __name__ == "__main__":
        parser = argparse.ArgumentParser()
        # Required parameters
        parser.add_argument(
            "--tf_checkpoint_path", default='albert_base_en/model.ckpt-best', type=str,  help="Path to the TensorFlow checkpoint path."
        )
        parser.add_argument(
            "--bert_config_file",
            default='albert_base_en/albert_config.json',
            type=str,
            help="The config json file corresponding to the pre-trained BERT model. \n"
            "This specifies the model architecture.",
        )
        parser.add_argument(
            "--pytorch_dump_path", default='albert_base_en/pytorch_model.bin', type=str,help="Path to the output PyTorch model."
        )
        args = parser.parse_args()
        convert_tf_checkpoint_to_pytorch(args.tf_checkpoint_path, args.bert_config_file, args.pytorch_dump_path)