Sparse CSR CPU: Add block sparse support for MKL path (#68710)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68710
This PR adds support for block sparse (BSR) matrices for functions that
use Inspector-Executor MKL Sparse API. At the moment of this PR it's:
* torch.addmm
* torch.addmv
* torch.triangular_solve (once https://github.com/pytorch/pytorch/pull/62180 is merged)
cc nikitaved pearu cpuhrsch IvanYashchuk
Test Plan: Imported from OSS
Reviewed By: ZolotukhinM
Differential Revision: D33179486
Pulled By: cpuhrsch
fbshipit-source-id: e1dec0dccdbfed8b280be16b8c11fc9e770d50ae
