Tensorify episodes and labels to save memory and simplify things#50

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eracah wants to merge 3 commits intomasterfrom tensor-episodes

+84-29

Commits on Jan 8, 2020

changed episodes from list of lists to list of tensors
eracah
committed

Commits on Jan 9, 2020

changed labels to be list of dicts with value being numpy arrays instead of a list of list of dicts with values being ints
eracah
committed
changed labels to be pytorch tensors instead of numpy arrays
eracah
committed