Known issues
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AttributeError: 'MultiDataLoader' object has no attribute 'sampler':
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This bug has been fixed in pytorch-lightning only recently and appears only in the multi-gpu mode. Quickest fix (for now) is to use a single GPU or revert to version 0.7.5 with ``pip install pytorch-lightning==0.7.5``.


TypeError: forward() takes 2 positional arguments but 3 were given
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This error causes other errors to appear, displaying multiple stacktraces, so the last line you actually see is:

::
    TypeError: 'NoneType' object is not iterable

The current fix is to revert pytorch-lightning to version 0.7.3.