[megatron] support global_aux_loss

[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 enhances the Megatron-SWIFT framework by integrating a new global_aux_loss strategy for MoE router load balancing, which is reflected in updated documentation and argument parsing. Concurrently, it refines the megatron_core dependency constraints and incorporates necessary code adjustments within the Qwen3Next model to maintain compatibility and leverage features from newer megatron.core versions, particularly concerning distributed communication patterns.

Highlights

• New MoE Load Balancing Strategy: Introduced support for a new global_aux_loss option for Mixture-of-Experts (MoE) router load balancing, updating both documentation and argument definitions.
• Dependency Version Update: The megatron_core dependency range has been updated to explicitly exclude versions 0.16 and above, ensuring compatibility with current features.
• Megatron.core API Adaptations: Implemented adaptations within the Qwen3Next model to handle potential API changes in megatron.core versions 0.15.0rc0 and higher, specifically for communication group handling and method signatures.

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[gemini-code-assist]

Code Review

This pull request adds support for global_aux_loss in Megatron and introduces compatibility changes for different versions of megatron-core. The changes are generally well-implemented, but I found a minor issue in the English documentation where a line of Chinese text was added. Please see my specific comment for details.

[gemini-code-assist]

This line appears to be in Chinese within an English document. It should either be translated to English for consistency or removed if it's not relevant here.