Use the original batch size from mobilenet_v2 paper. (#576)
Summary: Pull Request resolved: https://github.com/pytorch/benchmark/pull/576
Reviewed By: aaronenyeshi
Differential Revision: D32653318
Pulled By: xuzhao9
fbshipit-source-id: 4cd072d7d17cfbc39a7e74e51fbdf2c8f98b2bef
