Handle simple NNAPI flatten NHWC case (#61796)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61796
We can easily handle nnapi conversion for nhwc inputs
that have 1 channel or H & W are 1
Test Plan:
pytest test/test_nnapi.py::TestNNAPI::test_flatten
Imported from OSS
Reviewed By: saketh-are
Differential Revision: D29827735
fbshipit-source-id: 65dee4b42fceef1b032bf5dd1c4cc6e020d01e14
