[BE] Move data download logic to download_data.py
#2581
Merged
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download_url_to_file
which is heavily inspired by torch/hub.pysize_fmt
is borrowed from torch/autograd/profiler_util.pyFILES_TO_RUN
is defined, but tutorial is not in this shard, i.e.:download_dcgan_data
(which is 1Gb+ downloadable) only fordcgan_tutorial
download_lenet_mnist
(downloads from rate-limited GDrive) only forfgsm_tutorial
download_hymenoptera_data
only fortransfer_learning_tutorial
download_nlp_data
forseq2seq_translation_tutorial
,char_rnn_classification_tutorial
andchar_rnn_generation_tutorial