[DRAFT] Debug lines for cache

[VitalyFedyunin]

Stack from ghstack (oldest at bottom):

• -> #585

import torchtext

train_iter, val_iter, test_iter = \
        torchtext.datasets.IWSLT2017("data/IWSLT2017", language_pair=('en', 'de'))

print(next(iter(train_iter)))

[VitalyFedyunin]

Bunch of debug lines to see what is going on with cache keys. We can potentially fix it with additional requirements to file_name_fn and changing contact to some sort of group_by. But it is still error prone and as soon as we find good caching strategy we should redo 1:M or kill it.

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