Enable fp16 for torchvision models inference CUDA tests by default (#758)
Summary: Pull Request resolved: https://github.com/pytorch/benchmark/pull/758
Reviewed By: frank-wei
Differential Revision: D34294547
Pulled By: xuzhao9
fbshipit-source-id: 5c2834ffc11ed64f82489c56a290c3b9c569a24a