1. 1. Purpose
      update custom_ops, backend, and use_inductor refactor as discussed in https://github.com/vllm-project/vllm/issues/20283#event-20038024543
   2. Test Plan

1. 1. Test Result

—
<details>
<summary> Essential Elements of an Effective PR Description Checklist </summary>

• [ ] The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• [ ] The test plan, such as providing test command.
• [ ] The test results, such as pasting the results comparison before and after, or e2e results
• [ ] (Optional) The necessary documentation update, such as updating `supported_models.md` and `examples` for a new model.
• [ ] (Optional) Release notes update. If your change is user facing, please update the release notes draft in the [Google Doc](https://docs.google.com/document/d/1YyVqrgX4gHTtrstbq8oWUImOyPCKSGnJ7xtTpmXzlRs/edit?tab=t.0).
  </details>