[bugfix] fix megatron model_type

[Jintao-Huang]

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[gemini-code-assist]

Summary of Changes

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This pull request addresses a bug in the Megatron model initialization logic. It ensures that the model_type derived from the arguments is correctly supplied to the model and tokenizer retrieval function, preventing potential misconfigurations or errors related to an undefined or incorrect model type.

Highlights

• Megatron Model Type Fix: Corrected an issue where the model_type was not being properly passed during the initialization of Megatron models. This ensures that the correct model type from args.model_info is used.

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[gemini-code-assist]

Code Review

This pull request introduces a bugfix in the Megatron model loading process for multimodal models. The change ensures that the model_type is explicitly passed when creating a dummy model for initialization. This prevents potential errors where the model type might be incorrectly inferred from the model directory, making the model loading more robust. The fix is a single-line addition and appears correct and necessary.