drq: change view to reshape to support channels last (#1367)
Summary:
The current implementation of `drq` does not support **channels last** input since `view` has constraints on the input size and stride (https://pytorch.org/docs/stable/generated/torch.Tensor.view.html):
```
Cannot view a tensor with shape torch.Size([1, 32, 35, 35]) and strides (39200, 1, 1120, 32) as a tensor with shape (1, 39200)!
```
Change `view` to `reshape` which returns a view if the shapes are compatible, and copies (equivalent to calling `contiguous()`) otherwise.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1367
Reviewed By: erichan1
Differential Revision: D42480679
Pulled By: xuzhao9
fbshipit-source-id: 2a2b5a71950e77966637e38b5d494f8deaef1e5d
