[GitHub] sliawatimena edited a comment on issue #8955: Can't pickle MXNet Modules

[GitBox <gi...@apache.org>]

sliawatimena edited a comment on issue #8955: Can't pickle MXNet Modules
URL: https://github.com/apache/incubator-mxnet/issues/8955#issuecomment-428501426
 
 
   I am using windows 7, anaconda navigator 1.9.2, Python 3.6.6, Jupyter notebook 5.7.0, try to learn code from [Gluon crash course chapter 5](https://gluon-crash-course.mxnet.io/train.html). 
   
   I already add:
   import pickle
   
   I got stuck at 
   ```
   for data, label in train_data:
       print(data.shape, label.shape)
       break
   ---
   AttributeError                            Traceback (most recent call last)
   <ipython-input-8-91a66f98d1d2> in <module>()
   ----> 1 for data, label in train_data:
         2     print(data.shape, label.shape)
         3     break
   
   E:\Anaconda\envs\mxnet\lib\site-packages\mxnet\gluon\data\dataloader.py in __iter__(self)
       282         # multi-worker
       283         return _MultiWorkerIter(self._num_workers, self._dataset,
   --> 284                                 self._batchify_fn, self._batch_sampler)
       285 
       286     def __len__(self):
   
   E:\Anaconda\envs\mxnet\lib\site-packages\mxnet\gluon\data\dataloader.py in __init__(self, num_workers, dataset, batchify_fn, batch_sampler)
       142                 args=(self._dataset, self._key_queue, self._data_queue, self._batchify_fn))
       143             worker.daemon = True
   --> 144             worker.start()
       145             workers.append(worker)
       146 
   
   E:\Anaconda\envs\mxnet\lib\multiprocessing\process.py in start(self)
       103                'daemonic processes are not allowed to have children'
       104         _cleanup()
   --> 105         self._popen = self._Popen(self)
       106         self._sentinel = self._popen.sentinel
       107         # Avoid a refcycle if the target function holds an indirect
   
   E:\Anaconda\envs\mxnet\lib\multiprocessing\context.py in _Popen(process_obj)
       221     @staticmethod
       222     def _Popen(process_obj):
   --> 223         return _default_context.get_context().Process._Popen(process_obj)
       224 
       225 class DefaultContext(BaseContext):
   
   E:\Anaconda\envs\mxnet\lib\multiprocessing\context.py in _Popen(process_obj)
       320         def _Popen(process_obj):
       321             from .popen_spawn_win32 import Popen
   --> 322             return Popen(process_obj)
       323 
       324     class SpawnContext(BaseContext):
   
   E:\Anaconda\envs\mxnet\lib\multiprocessing\popen_spawn_win32.py in __init__(self, process_obj)
        63             try:
        64                 reduction.dump(prep_data, to_child)
   ---> 65                 reduction.dump(process_obj, to_child)
        66             finally:
        67                 set_spawning_popen(None)
   
   E:\Anaconda\envs\mxnet\lib\multiprocessing\reduction.py in dump(obj, file, protocol)
        58 def dump(obj, file, protocol=None):
        59     '''Replacement for pickle.dump() using ForkingPickler.'''
   ---> 60     ForkingPickler(file, protocol).dump(obj)
        61 
        62 #
   
   AttributeError: Can't pickle local object 'Dataset.transform_first.<locals>.base_fn'
   ```
   
   please help. thanks.

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