Fix GGuf and add back test_gguf.py

[Fridge003]

Motivation

Close #7012

Modifications

Checklist

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[Fridge003]

cc @zhyncs

[gemini-code-assist]

Summary of Changes

Hello @Fridge003, 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 addresses issues with loading GGUF quantized models. The core changes involve modifying how quantized weights are handled during the model loading phase, specifically by deferring or adding a post-loading processing step. This fix allows the previously disabled GGUF test suite to be re-enabled, ensuring correct functionality for GGUF models.

Highlights

• GGUF Loading Fix: Implemented a fix for loading GGUF quantized models by adjusting the weight processing logic during model initialization.
• Post-Loading Weight Processing: Introduced a new step in the model loading process to call process_weights_after_loading on quantized modules after the initial weights are loaded.
• Test Suite Update: Re-enabled the test_gguf.py test file in the vllm_dependency_test suite, which was previously commented out.

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[gemini-code-assist]

Code Review

This pull request refactors GGUF model loading by centralizing the finalization of quantized weights to the process_weights_after_loading method. The re-enablement of GGUF tests supports the correctness of this fix.

[zhyncs]

awesome