[ONNX] Fix export for avg_pool with default stride (#33017)
Summary:
If using nn.functional avg_pool, stride is an optional arg. If not provided, it is set to kernel_size.
This PR fixes the export of avg_pool with default stride.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33017
Reviewed By: hl475
Differential Revision: D19759604
Pulled By: houseroad
fbshipit-source-id: b0352db6fbaf427f4cff9ba8a942efdeb39b6f02
