pytorch迁移学习SourceChangeWarning

我们这里是自己定义的网络然后复用两次

先放出警告的代码

SourceChangeWarning: source code of class '__main__.ConvNet' has changed. you can retrieve the original source code by accessing the object's source attribute or set `torch.nn.Module.dump_patches = True` and use the patch tool to revert the changes.
  warnings.warn(msg, SourceChangeWarning)

解决办法：心里清楚就好了，反正是警告也不是啥大问题

报错原因

先看看源代码

    def _check_container_source(container_type, source_file, original_source):
        try:
            current_source = inspect.getsource(container_type)
        except Exception:  # saving the source is optional, so we can ignore any errors
            warnings.warn("Couldn't retrieve source code for container of "
                          "type " + container_type.__name__ + ". It won't be checked "
                          "for correctness upon loading.")
            return
        if original_source != current_source:
            if container_type.dump_patches:
                file_name = container_type.__name__ + '.patch'
                diff = difflib.unified_diff(current_source.split('\n'),
                                            original_source.split('\n'),
                                            source_file,
                                            source_file, lineterm="")
                lines = '\n'.join(diff)
                try:
                    with open(file_name, 'a+') as f:
                        file_size = f.seek(0, 2)
                        f.seek(0)
                        if file_size == 0:
                            f.write(lines)
                        elif file_size != len(lines) or f.read() != lines:
                            raise IOError
                    msg = ("Saved a reverse patch to " + file_name + ". "
                           "Run `patch -p0 < " + file_name + "` to revert your "
                           "changes.")
                except IOError:
                    msg = ("Tried to save a patch, but couldn't create a "
                           "writable file " + file_name + ". Make sure it "
                           "doesn't exist and your working directory is "
                           "writable.")
            else:
                msg = ("you can retrieve the original source code by "
                       "accessing the object's source attribute or set "
                       "`torch.nn.Module.dump_patches = True` and use the "
                       "patch tool to revert the changes.")
            msg = ("source code of class '{}' has changed. {}"
                   .format(torch.typename(container_type), msg))
            warnings.warn(msg, SourceChangeWarning)

实际上这里报错是因为调用时自动比较了源代码和现代码的区别，发现两者不一致提醒一下罢了。