[PyTorch] Documentation for op fuser API

[timmoon10]

Description

This PR adds a basic usage guide for the op fuser and includes it in the autogenerated API docs.

It is ready as-is, but if reviews take a while I may expand it with a guide on creating custom fused ops.

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)
• 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 refactoring

Changes

• Add basic usage guide for op fuser
• Include TE ops in autogenerated API docs
• Debug TE ops docstrings

Checklist:

• I have read and followed the contributing guidelines
• The functionality is complete
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• 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

[greptile-apps]

Greptile Summary

Added comprehensive documentation for the operation fuser API, including a detailed usage guide with code examples, diagrams, and integration into the API reference docs.

Major changes:

• Created new op_fuser.rst guide covering basic usage, quantization workflows, branching operations, implementation details, and common misconceptions
• Added operation fuser section to PyTorch API documentation listing all 26+ fusible operations
• Fixed docstring formatting across 15+ Python modules (single backticks to double backticks for proper RST rendering)
• Improved parameter documentation (e.g., `False` to False, `None` to None)
• Fixed RST hyperlink formatting (added spaces before closing backticks)
• Added .DS_Store to .gitignore

Confidence Score: 5/5

• This PR is safe to merge with no risk - pure documentation improvements
• All changes are documentation-only: new user guide, API reference updates, and docstring formatting fixes. No functional code changes. One minor style issue with missing newline at EOF in .gitignore.
• No files require special attention

Important Files Changed

Filename	Overview
docs/examples/op_fuser/op_fuser.rst	Added comprehensive usage guide for op fuser API with examples and diagrams
docs/api/pytorch.rst	Added operation fuser API reference section with all op classes
.gitignore	Added .DS_Store to ignored files (missing newline at EOF)

Sequence Diagram

sequenceDiagram
    participant User
    participant Sequential
    participant FusibleOperation
    participant OperationFuser
    participant FusedKernel

    User->>Sequential: Construct with ops
    User->>Sequential: Forward pass
    Sequential->>OperationFuser: Group operations
    OperationFuser->>FusibleOperation: Analyze fusion opportunities
    FusibleOperation-->>OperationFuser: Return fusion metadata
    OperationFuser->>FusedKernel: Launch fused forward
    FusedKernel-->>OperationFuser: Forward result
    OperationFuser-->>Sequential: Return output
    Sequential-->>User: Output tensor
    
    User->>Sequential: Backward pass
    Sequential->>OperationFuser: Trigger backward
    OperationFuser->>FusedKernel: Launch fused backward
    FusedKernel-->>OperationFuser: Gradients
    OperationFuser-->>Sequential: Return gradients
    Sequential-->>User: Loss gradients

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[greptile-apps]

Additional Comments (1)

1. transformer_engine/pytorch/ops/basic/activation.py, line 387 (link)

   syntax: Extra space before period.

   _{Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!}

_{19 files reviewed, 1 comment}

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[timmoon10]

/te-ci core pytorch

[greptile-apps]

Additional Comments (1)

1. .gitignore, line 44 (link)

   style: missing newline at end of file

   _{Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!}

_{19 files reviewed, 1 comment}

_{Edit Code Review Agent Settings | Greptile}