Fix type in iter rounds (#1408)
Summary:
torch.cuda.empty_cache() is causing stableness issues in yolov3, so we are removing it from the benchmark test.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1408
Reviewed By: erichan1
Differential Revision: D43194381
Pulled By: xuzhao9
fbshipit-source-id: c5f819dad9ba8633651267968629848181dc3bcd
