Summary:
Both cuSPASRELt and CUTLASS support 1:2 semi-structured sparsity for
fp32, which this PR enables.(thanks @alexsamardzic).
Furthermore, this PR also updates the sparse_config to take into account
the different shape constraints for sparse and dense matrices.
Technically, cuSPARSELt supports smaller sparse matrix constraints as it
seens to pad to the CUTLASS constraints under the hood. However, in
practice small sparse matrices are not commonly used and we care more
about the dense constraints for LLM inference.
For now, we keep the CUTLASS constraints in place for both cuSPARSELt
and CUTLASS tensors
This PR also reconnects the _FUSE_TRANSPOSE flag for cuSPARSELt tensors.
Test Plan:
```
python test/test_sparse_semi_structured.py
```
Reviewers:
Subscribers:
Tasks:
Tags:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/115550
Approved by: https://github.com/cpuhrsch
Summary:
This PR adds in torch.compile support for semi-structured sparsity,
using the subclass tracing @bdhirsh added.
Based on wether we are using cuSPARSELt or CUTLASS, we return a
different representation of the inner tensors.
Test Plan:
```
python test/test_sparse_semi_structured.py -k compile
```
Reviewers:
Subscribers:
Tasks:
Tags:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/111049
Approved by: https://github.com/cpuhrsch
