[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 also includes a guide for implementing custom ops and fusions.

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
• Add guide for implementing custom ops and fusions

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

This PR adds comprehensive documentation for the operation fuser API, including a detailed usage guide with examples and a developer guide for implementing custom operations and fusions. The documentation demonstrates basic usage patterns, quantization support, and branching operations.

Key changes:

• New docs/examples/op_fuser/op_fuser.rst guide with usage examples and developer guidance
• Added operation fuser classes and functions to API documentation in docs/api/pytorch.rst
• Cleaned up docstrings across multiple operation files by fixing RST hyperlink formatting (adding spaces between link text and URLs)
• Added corresponding test cases in tests/pytorch/test_fusible_ops.py that mirror the documentation examples

What was reviewed:
All previous thread issues have been addressed or acknowledged by the developer. The documentation is well-structured with clear examples. The code changes are primarily formatting improvements to docstrings for better rendering in autogenerated documentation. The test cases provide executable validation of the documentation examples.

Confidence Score: 5/5

• This PR is safe to merge - it's a documentation-only change with corresponding tests
• The PR exclusively adds documentation and fixes docstring formatting. All previously identified issues in review threads have been addressed or acknowledged. The new documentation is comprehensive, well-structured, and includes matching test cases for validation. No functional code changes affect runtime behavior.
• No files require special attention

Important Files Changed

Filename	Overview
docs/examples/op_fuser/op_fuser.rst	New comprehensive documentation guide for op fuser API with usage examples and developer guide
docs/api/pytorch.rst	Added operation fuser classes and functions to API documentation
tests/pytorch/test_fusible_ops.py	Added test cases that match documentation examples for custom ops and fusions
transformer_engine/pytorch/ops/basic/activation.py	Fixed RST hyperlink formatting by adding spaces between link text and URLs in docstrings
transformer_engine/pytorch/ops/linear.py	Updated docstrings for consistency and API documentation generation

_{Last reviewed commit: 03abb07}

[ptrendx]

Not sure what that means - any examples?

[timmoon10]

For MXFP8, it's not safe for the quantize op to produce a MXFP8Tensor with swizzled scales. There's no way to know if it will consumed by a GEMM or by something else.

[timmoon10]

@greptile-apps I'm about to push a commit with a major reorganization. In addition to checking correctness, please check that the writing is clear and sounds natural.

[timmoon10]

/te-ci

[greptile-apps]

_{25 files reviewed, no comments}

_{Edit Code Review Agent Settings | Greptile}