fix RegexLabeller obj has no attr __name__

[amaarora]

While looking into DataSource I got an error

AttributeError: 'RegexLabeller' object has no attribute '__name__'

This can be replicated by:

path = untar_data(URLs.PETS); path

np.random.seed(2)
pat = r'/([^/]+)_\d+.jpg$'

items = get_image_files(path/'images')
tfms = L([PILBase.create], [RegexLabeller(pat), Categorize])
splits = RandomSplitter(0.2)(items)
dsrc = DataSource(items, tfms=tfms, splits=splits)

dsrc.tls

From what I understand, issue occurs due to calling __name__ on RegexLabeller() and this PR attempts to fix it.

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[sgugger]

This is not going to work each time we have a function instead of an instance of a class (it's going to show "function" instead of the function name) so we need to use something else here that checks for a __name__ attribute then reverts to a __class__.__name__.

[amaarora]

checks for a __name__ attribute then reverts to a __class__.__name__

Thanks @sgugger! I have updated PR to getattr(o, '__name__', o.__class__.__name__) and this seems to work for me.

[sgugger]

Thanks!