AttributeError: Can't pickle local object 'MiniImageNet.__init__.<locals>.convert_raw'

本人正在学习机器学习，在利用miniImageNet尝试训练一种元学习分类器，执行代码为

python train_classifier.py --config configs/train_classifier_mini.yaml

但是出现了大量报错：

Traceback (most recent call last):
  File "train_classifier.py", line 279, in <module>
    main(config)
  File "train_classifier.py", line 147, in main
    for data, label in tqdm(train_loader, desc='train', leave=False):
  File "D:\ProgramData\Anaconda3\envs\pytorch\lib\site-packages\tqdm\std.py", line 1180, in __iter__
    for obj in iterable:
  File "D:\ProgramData\Anaconda3\envs\pytorch\lib\site-packages\torch\utils\data\dataloader.py", line 359, in __iter__
    return self._get_iterator()
  File "D:\ProgramData\Anaconda3\envs\pytorch\lib\site-packages\torch\utils\data\dataloader.py", line 305, in _get_iterator
    return _MultiProcessingDataLoaderIter(self)
  File "D:\ProgramData\Anaconda3\envs\pytorch\lib\site-packages\torch\utils\data\dataloader.py", line 918, in __init__
    w.start()
  File "D:\ProgramData\Anaconda3\envs\pytorch\lib\multiprocessing\process.py", line 105, in start
    self._popen = self._Popen(self)
  File "D:\ProgramData\Anaconda3\envs\pytorch\lib\multiprocessing\context.py", line 223, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "D:\ProgramData\Anaconda3\envs\pytorch\lib\multiprocessing\context.py", line 322, in _Popen
    return Popen(process_obj)
  File "D:\ProgramData\Anaconda3\envs\pytorch\lib\multiprocessing\popen_spawn_win32.py", line 65, in __init__
    reduction.dump(process_obj, to_child)
  File "D:\ProgramData\Anaconda3\envs\pytorch\lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 'MiniImageNet.__init__.<locals>.convert_raw'

请问各位这些是什么意思，且如何解决？

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