Revert adding pytorch-triton as a build requirement

[tdophung]

Description

Since pytorch-triton is a placeholder in PyPI, it should not be auto fetched and install in TE build. Users that uses torch should already have pytorch-triton installed when they install torch whl.

WE should also not revert this to requires 'triton' either because it is currently not compatible with torch.compile

Fixes # (issue)

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

remove pytorch-triton from list of requirements in TE PyTorch build

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 removes pytorch-triton from the build requirements list in build_tools/pytorch.py. The change is correct because pytorch-triton on PyPI is a placeholder package that raises "Should never be installed" errors. Users who install PyTorch already have pytorch-triton bundled with their torch installation from PyTorch's package index, making it unnecessary and problematic to list as a build requirement.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The change correctly removes a problematic dependency that was causing installation failures. PyTorch users already have pytorch-triton installed from their torch installation, and the PyPI placeholder version is non-functional. The codebase's triton imports will continue to work as expected since they rely on the version bundled with PyTorch.
• No files require special attention

Important Files Changed

Filename	Overview
build_tools/pytorch.py	Removes pytorch-triton from install requirements and simplifies docstring

Sequence Diagram

sequenceDiagram
    participant User
    participant pip
    participant setup.py
    participant pytorch.py
    participant PyTorch

    User->>pip: pip install transformer_engine_torch
    pip->>setup.py: Execute setup
    setup.py->>pytorch.py: Call install_requirements()
    
    alt Before this PR
        pytorch.py-->>setup.py: Returns list with pytorch-triton
        setup.py->>pip: Install pytorch-triton (placeholder on PyPI)
        Note over pip: Would fail: pytorch-triton on PyPI<br/>is a placeholder
    end
    
    alt After this PR
        pytorch.py-->>setup.py: Returns list without pytorch-triton
        setup.py->>pip: Install dependencies (no pytorch-triton)
        Note over pip: Success: Users already have<br/>pytorch-triton from torch install
    end
    
    User->>PyTorch: Already has pytorch-triton<br/>from torch installation
    Note over User,PyTorch: torch.compile() can use<br/>pre-installed pytorch-triton

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[greptile-apps]

Additional Comments (1)

1. build_tools/pytorch.py, line 16-26 (link)

   style: docstring is now outdated since pytorch-triton is no longer in the requirements list

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[ptrendx]

Could you change the docstring too @tdophung? Since it now incorrectly mentions pytorch-triton.