change shape for some ops to reduce variance (#25686)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25686
From the new runs, we found some ops that we can increase the shape size to reduce the variance
Test Plan:
```
[huaminli@devvm2388.ftw3 ~/fbsource/fbcode] buck run mode/dev-nosan caffe2/benchmarks/operator_benchmark:benchmark_all_test -- --operators None --iterations 3
```
last few lines of the output P108624830
Reviewed By: mingzhe09088
Differential Revision: D17199623
fbshipit-source-id: a9277509f6d3e6503d3086b3b02f87eebd953239
