Remove unused mlc_llm.op.position_embedding module

[babusid]

This was a stale duplicate of tvm.relax.frontend.nn.llm.position_embedding.

Verified removal is safe by:

1. Searching for all imports from mlc_llm.op.position_embedding (none found)
2. Testing that mlc_llm.op imports correctly after cleanup
3. sanity checked by running python -m mlc_llm chat HF://mlc-ai/Qwen3-1.7B-q0f16-mlc --device cuda

[gemini-code-assist]

Summary of Changes

Hello @babusid, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on code hygiene by eliminating a redundant and unused module. By removing the mlc_llm.op.position_embedding module, which was a duplicate of an existing component, the codebase is streamlined, reducing potential confusion and maintenance overhead. This change simplifies the project structure without impacting functionality, as verified by the author.

Highlights

• Module Removal: The mlc_llm.op.position_embedding module has been completely removed from the codebase. This module was identified as a stale duplicate of tvm.relax.frontend.nn.llm.position_embedding.
• Import Cleanup: The import statement for llama_rope from the now-removed position_embedding module was removed from mlc_llm.op/__init__.py, ensuring consistency and removing dead code references.

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Changelog

• python/mlc_llm/op/init.py
  • Removed the import statement for llama_rope.
• python/mlc_llm/op/position_embedding.py
  • Removed the entire file, as the module was a stale duplicate.

Activity

• The author verified the safety of the removal by searching for all imports from mlc_llm.op.position_embedding (none found).
• The author tested that mlc_llm.op imports correctly after the cleanup.
• A sanity check was performed by running python -m mlc_llm chat HF://mlc-ai/Qwen3-1.7B-q0f16-mlc --device cuda.

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[gemini-code-assist]

Code Review

This pull request removes the mlc_llm.op.position_embedding module, which has been identified as a stale duplicate of functionality existing in tvm.relax.frontend.nn.llm.position_embedding. The changes involve deleting the python/mlc_llm/op/position_embedding.py file and updating the __init__.py to remove the obsolete import. This is a good housekeeping change that removes unused code, improving the overall maintainability of the codebase. The author has confirmed that the removal is safe, and the changes look correct.