[Refactor] Change the way of import triton

[yewentao256]

Purpose

As shown in vllm/tools/check_triton_import.py, only

ALLOWED_LINES = {
    "from vllm.triton_utils import triton",
    "from vllm.triton_utils import tl",
    "from vllm.triton_utils import tl, triton",
}

are allowed, this pr fixes the possible pre-commit error

[github-actions]

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[gemini-code-assist]

Summary of Changes

Hello @yewentao256, 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 refactors how Triton and Triton.language (tl) modules are imported throughout the codebase. The change ensures that all Triton-related imports conform to a centralized vllm.triton_utils module, aligning with project-specific import guidelines and preventing pre-commit validation failures.

Highlights

• Import Standardization: Standardized the way Triton and Triton.language (tl) modules are imported across multiple files. This change ensures all Triton-related imports now originate from vllm.triton_utils, aligning with the project's enforced import style.
• Pre-commit Compliance: Addressed potential pre-commit errors by modifying import statements to conform to the ALLOWED_LINES defined in vllm/tools/check_triton_import.py, which restricts direct triton or triton.language imports.

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[gemini-code-assist]

Code Review

This pull request refactors the way Triton is imported across several files, centralizing the import logic into vllm.triton_utils. This is a good practice that improves maintainability and helps in handling cases where Triton is not available. The changes are consistent and correct. I have reviewed the modifications and found no issues to report at the requested severity levels (medium, high, critical).