参考：
https://www.cnblogs.com/hcxss/p/15894028.html
https://www.jianshu.com/p/8e9cb065a0c8
https://www.zhihu.com/question/484014824/answer/2351817012?utm_id=0
https://github.com/yyxx1997/pytorch/tree/master/bert-sst2
基于 BERT 实现的情感分析(文本分类)----概念与应用--Java,.Net,Python,Javascript,Vue,数据库程序教程 (zlprogram.com)
pytorch安装后提示找不到GPU，torch.cuda.is_available()返回False
pip3 install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu118 -i https://mirrors.aliyun.com/pypi/simple