windows环境下使用pathlib库加载pytorch训练好的模型出现不能实例化PosixPath错误。

在pathlib.py文件的1039行做如下修改：

    def __new__(cls, *args, **kwargs):
        # 源码
        # if cls is Path:
        #     cls = WindowsPath if os.name == 'nt' else PosixPath
        # self = cls._from_parts(args, init=False)
        # if not self._flavour.is_supported:
        #     raise NotImplementedError("cannot instantiate %r on your system"
        #                               % (cls.__name__,))
        # self._init()
        # return self

        # 修改
        if cls is Path:
            # cls = WindowsPath if os.name == 'nt' else PosixPath
            cls = WindowsPath
        self = cls._from_parts(args, init=False)
        # Windows doesn't support PosixPath
        if type(self) == PosixPath:
            cls = WindowsPath
            self = cls._from_parts(args, init=False)
        if not self._flavour.is_supported:
            raise NotImplementedError("cannot instantiate %r on your system"
                                      % (cls.__name__,))
        self._init()
        return self

        其中上方注释部分为源码，下方的代码为修改代码。