[Bugfix][CI] Fix config resolving logic with remote models

[ywang96]

Purpose

#27566 introduced a regression where remote models (e.g, deepseek-ai/deepseek-vl2) without architectures will be not deploy-able even with --hf_overrides '{"architectures": ["DeepseekVLV2ForCausalLM"]}' on vLLM because of a strict model type check. This PR relaxes this check and adds a warning when this happens.

This also fixes the failed entrypoints/test_chat_utils.py::test_resolve_content_format_fallbacks[deepseek-ai/deepseek-vl2-tiny-string] CI test on main.

Test Plan

Test Result

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Essential Elements of an Effective PR Description Checklist

• 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.
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• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
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[gemini-code-assist]

Code Review

This pull request aims to fix a regression for remote models that don't have an architectures field in their configuration by relaxing a strict check on model_type. While the intention is correct, the implementation introduces a new issue by using "AutoModel" as a dummy architecture. This will cause a runtime error because "AutoModel" is a real class in the transformers library that doesn't conform to vLLM's expectations for model classes. I've provided a critical comment with a suggested fix to use a unique placeholder name and also simplify the logic.

[chatgpt-codex-connector]

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[ywang96]

/gemini review

[gemini-code-assist]

Code Review

This pull request addresses a regression where remote models lacking an architectures field in their configuration would fail to load, even when the architecture was supplied through hf_overrides. The fix correctly relaxes a strict check, replacing a ValueError with a logger.warning. This allows the model loading to proceed so that the hf_overrides can be applied later. The change is well-targeted and effectively resolves the described issue.

[DarkLight1337]

Sorry I missed it, thanks for fixing