Improve quality of pytorch_stargan (#648)
Summary:
Default train batch size: 16
Source: https://github.com/yunjey/stargan/blob/94dd002e93a2863d9b987a937b85925b80f7a19f/main.py#L73
Added data prefetch and eval batch size support.
Train profile (bs=16):
Eval profile (bs=16):
Pull Request resolved: https://github.com/pytorch/benchmark/pull/648
Reviewed By: aaronenyeshi
Differential Revision: D33138537
Pulled By: xuzhao9
fbshipit-source-id: 1583cbdff3eb9f38c4a162bbd279b61d100d72f4
