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Refactor the
unfold4d
operation to reduce code duplication and add a default implementation for usingconv2d
with a weights matrix, making implementing theunfold4d
operation optional for backends with probably good performance.Made options required like other backend module options, but added them as optional for the newly created
Unfold4d
module using the config utilities.I added more tests to ensure that unfold4d has no bugs comparing with PyTorch.
@agelas What are your thoughts?