[megatron] update megatron_args default_val

[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 modifies the default behavior of checkpoint loading and optimization within the Megatron framework. By setting ckpt_fully_parallel_load and ckpt_assume_constant_structure to True by default, the system will now leverage parallel loading and structural assumptions for improved checkpoint performance without requiring explicit user configuration. The corresponding documentation has been updated to reflect these changes, ensuring consistency between code and user guides.

Highlights

• Default Argument Values: The default values for ckpt_fully_parallel_load and ckpt_assume_constant_structure have been changed from False to True in MegatronArguments.
• Documentation Update: The Chinese and English documentation for command-line parameters has been updated to reflect the new default values for ckpt_fully_parallel_load and ckpt_assume_constant_structure.

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[gemini-code-assist]

Code Review

This pull request updates the default values for ckpt_fully_parallel_load and ckpt_assume_constant_structure to True. These changes enable checkpoint loading performance optimizations by default. The documentation in both English and Chinese has been updated accordingly to reflect these new defaults. The changes are consistent across the codebase and documentation, and they appear to be a good improvement for default performance.