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[sparse] Add padding for dense matrices in semi-structured sparse
Summary: Currently we have shape constraints in semi-structured sparsity for both CUTLASS and cuSPARSELt These shape constraints unfortunately apply to both the dense and sparse matrices in sparsedense matmul. This PR adds in support for calling `F.pad` in order to pad dense matrices to the right size with zeros and then pull out the corresponding rows from the resultant result matrix. We also throw a warning in this case. The tests have also been updated to take in a dense_input_shape parameter. Test Plan: ``` python test/test_sparse_semi_structured.py ``` Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 08453f0fb165a01bc378319ad650c0ab9129cbc9 Pull Request resolved: #110583
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