[bugfix] Fix metric megatron

[Jintao-Huang]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @Jintao-Huang, 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 two minor issues related to argument parsing and metric handling within the Megatron framework. It refines the type conversion for a specific configuration parameter and ensures that evaluation metric processing is conditionally applied, improving the robustness and correctness of the system's operations.

Highlights

• Rotary Base Argument Handling: Ensured that the rotary_base argument is explicitly cast to an integer if it is provided (i.e., not None), preventing potential type-related issues.
• Evaluation Metric Processing Scope: Corrected the scope of metric computation, item processing, and reset within the evaluate method. This logic now correctly executes only when self.eval_metrics is not None.

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[gemini-code-assist]

Code Review

The pull request includes a critical bug fix related to metric evaluation and a type conversion for rotary_base. The changes improve the robustness and correctness of the Megatron training arguments and evaluation logic.

[gemini-code-assist]

The else block ensures that self.rotary_base is explicitly converted to an integer if it's not None. This is a good practice to maintain type consistency, especially if rotary_base can be passed as a string from external configurations (e.g., command-line arguments).