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Revert "Fix(models/siglip): Add compatibility for Gemma models quantized by llm-compressor" #20030

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merged 1 commit into from
Jun 25, 2025

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@Isotr0py Isotr0py commented Jun 24, 2025

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@Isotr0py Isotr0py added the ready ONLY add when PR is ready to merge/full CI is needed label Jun 24, 2025
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Summary of Changes

Hello @Isotr0py, 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!

I've submitted this pull request to revert a previous change that inadvertently introduced a regression, specifically preventing the successful loading of unquantized Gemma3 models. The primary goal is to restore stability and functionality for these models while a more robust and compatible solution for quantized models is developed and submitted.

Highlights

  • Reversion of Previous Change: This pull request fully reverts the changes introduced in vllm-project/vllm#19643.
  • Gemma3 Model Compatibility Fix: The reversion specifically addresses a reported issue where the previous change (#19643) broke the loading of unquantized Gemma3 models. This PR restores compatibility for these models.
  • Tensor Mapping Adjustment: The core change involves removing a specific tensor mapping entry ("vision_tower.vision_model.": "vision_model." from vllm/model_executor/models/gemma3_mm.py) that was causing the regression.
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Code Review

This pull request reverts a previous change that added compatibility for Gemma models quantized by llm-compressor. The reversion aims to address a reported issue where the original change broke unquantized Gemma3 models loading. The review focuses on ensuring the reverted code maintains the project's overall functionality and stability.

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medium

This line was removed as part of reverting the pull request. Ensure that the removal does not negatively impact the functionality of the code, especially concerning vision tower processing.

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Hi @Isotr0py ,

Thank you for the heads-up and for maintaining the stability of the main branch. I sincerely apologize that my initial fix caused a regression for unquantized Gemma3 models.

I understand the issue now. My previous fix was not specific enough and affected other model-loading paths.

I will start working on a proper solution immediately. My plan is to create a more targeted fix on a new branch that handles the quantized VLM case without impacting the standard text model loading. I will ensure it's thoroughly verified before submitting a new Pull Request.

I appreciate your trust and will keep you updated.

@Isotr0py Isotr0py requested a review from DarkLight1337 June 25, 2025 03:18
@DarkLight1337 DarkLight1337 merged commit 2273ec3 into main Jun 25, 2025
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@DarkLight1337 DarkLight1337 deleted the revert-19643-fix-gemma3-keyerror branch June 25, 2025 03:23
gmarinho2 pushed a commit to gmarinho2/vllm that referenced this pull request Jun 26, 2025
xjpang pushed a commit to xjpang/vllm that referenced this pull request Jun 30, 2025
wseaton pushed a commit to wseaton/vllm that referenced this pull request Jun 30, 2025
wseaton pushed a commit to wseaton/vllm that referenced this pull request Jun 30, 2025
wwl2755-google pushed a commit to wwl2755-google/vllm that referenced this pull request Jul 1, 2025
avigny pushed a commit to avigny/vllm that referenced this pull request Jul 31, 2025
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