cudnn grouped convolution nhwc patch (#31444)
Summary:
Earlier cudnn version doesn't support grouped convolution in NHWC well. Legit
configuration in later cudnn version might return CUDNN_STATUS_NOT_SUPPORTED.
We are falling back to NCHW when runtime check of cudnn version is < 7.6.0 to
keep the logic simple.
Note:
We might update the heuristics, 7.6.0 is very conservative.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31444
Differential Revision: D19232414
Pulled By: VitalyFedyunin
fbshipit-source-id: 4c2d79ed347c49cd388bbe5b2684dbfa233eb2a3
