Don't use auto_model_type._model_mapping.items() in _config_cls_name_…

[byjiang1996]

…to_arch_name_mapping b/c it was broken in latest transformer

Motivation

Fix TestMistral3_1Server & TestPixtralServer UT failures caused by transformer bug

Modifications

n/a

Checklist

• Format your code according to the Code Formatting with Pre-Commit.
• Add unit tests as outlined in the Running Unit Tests.
• Update documentation / docstrings / example tutorials as needed, according to Writing Documentation.
• Provide throughput / latency benchmark results and accuracy evaluation results as needed, according to Benchmark and Profiling and Accuracy Results.
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[gemini-code-assist]

Summary of Changes

Hello @byjiang1996, 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 provides a critical fix to ensure compatibility with the latest transformer library, resolving unit test failures related to model server functionalities. The change involves a more robust method of accessing model configuration mappings to adapt to recent upstream library changes.

Highlights

• Bug Fix & Compatibility: This pull request addresses and resolves unit test failures for TestMistral3_1Server and TestPixtralServer. These failures were caused by a breaking change or unexpected behavior in the _model_mapping.items() method within the latest version of the transformer library.
• Code Robustness: The _config_cls_name_to_arch_name_mapping function in python/sglang/srt/models/llava.py has been updated. Instead of directly iterating over auto_model_type._model_mapping.items(), it now iterates over the keys and then safely retrieves the corresponding values using get(key, None), including a None check to prevent potential errors.

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[gemini-code-assist]

Code Review

The code changes address a bug in the transformers library by iterating over the keys of a dictionary instead of using .items(). A suggestion has been made to improve readability.