fused out correction in CP

[xiaoyao0115]

Description

Fused multiple kernels in the out correction computation of attention in CP into a single kernel, reducing total correction runtime and the kernel CPU launch overheads.

Type of change

• [ ] Documentation change (change only to the documentation, either a fix or a new content)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Infra/Build change
• [ ] Code refractor

Checklist:

• [ ] I have read and followed the contributing guidelines
• [x] The functionality is complete
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes

[xrennvidia]

/te-ci pytorch L1