traceback of errors from generate lmdb from imagefolder

generateLmdbfromImagefolder.errlog

(base) D:\Efficient-PyTorch\tools>python folder2lmdb.py -f "C:\Users\ChooWilson\.fastai\data\kaggle-cat-dog" -s train
Loading dataset from C:\Users\ChooWilson\.fastai\data\kaggle-cat-dog\train
Generate LMDB to C:\Users\ChooWilson\.fastai\data\kaggle-cat-dog\train.lmdb
2000 2000
Traceback (most recent call last):
  File "folder2lmdb.py", line 181, in <module>
    folder2lmdb(args.folder, num_workers=args.procs, name=args.split)
  File "folder2lmdb.py", line 150, in folder2lmdb
    for idx, data in enumerate(data_loader):
  File "C:\Users\ChooWilson\Anaconda3\lib\site-packages\torch\utils\data\dataloader.py", line 279, in __iter__
    return _MultiProcessingDataLoaderIter(self)
  File "C:\Users\ChooWilson\Anaconda3\lib\site-packages\torch\utils\data\dataloader.py", line 719, in __init__
    w.start()
  File "C:\Users\ChooWilson\Anaconda3\lib\multiprocessing\process.py", line 112, in start
    self._popen = self._Popen(self)
  File "C:\Users\ChooWilson\Anaconda3\lib\multiprocessing\context.py", line 223, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\ChooWilson\Anaconda3\lib\multiprocessing\context.py", line 322, in _Popen
    return Popen(process_obj)
  File "C:\Users\ChooWilson\Anaconda3\lib\multiprocessing\popen_spawn_win32.py", line 65, in __init__
    reduction.dump(process_obj, to_child)
  File "C:\Users\ChooWilson\Anaconda3\lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 'folder2lmdb.<locals>.<lambda>'

(base) D:\Efficient-PyTorch\tools>Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\ChooWilson\Anaconda3\lib\multiprocessing\spawn.py", line 105, in spawn_main
    exitcode = _main(fd)
  File "C:\Users\ChooWilson\Anaconda3\lib\multiprocessing\spawn.py", line 115, in _main
    self = reduction.pickle.load(from_parent)
EOFError: Ran out of input