Import HDF5 from main thread
Import HDF5 from main thread

Doing it from a worker thread is unsafe.
Reference:
https://github.com/deepmind/torch-hdf5/issues/42

gheinrich/DIGITS-GAN,jmancewicz/DIGITS,Lucaszw/DIGITS,gheinrich/DIGITS-GAN,TimZaman/DIGITS,Lucaszw/DIGITS,TimZaman/DIGITS,Lucaszw/DIGITS,dongjoon-hyun/DIGITS,ethantang95/DIGITS,brainstorm-ai/DIGITS,jmancewicz/DIGITS,dongjoon-hyun/DIGITS,dongjoon-hyun/DIGITS,Deepomatic/DIGITS,Deepomatic/DIGITS,bygreencn/DIGITS,brainstorm-ai/DIGITS,TimZaman/DIGITS,TimZaman/DIGITS,Lucaszw/DIGITS,batra-mlp-lab/DIGITS,batra-mlp-lab/DIGITS,ethantang95/DIGITS-GAN,ethantang95/DIGITS,ethantang95/DIGITS-GAN,brainstorm-ai/DIGITS,bygreencn/DIGITS,jmancewicz/DIGITS,ethantang95/DIGITS,gheinrich/DIGITS-GAN,bygreencn/DIGITS,batra-mlp-lab/DIGITS,jmancewicz/DIGITS,ethantang95/DIGITS-GAN,ethantang95/DIGITS,bygreencn/DIGITS,Deepomatic/DIGITS,batra-mlp-lab/DIGITS,ethantang95/DIGITS-GAN,brainstorm-ai/DIGITS,gheinrich/DIGITS-GAN,Deepomatic/DIGITS,dongjoon-hyun/DIGITS