Allow larger max num dispatch tokens per rank for DeepEP

[fzyzcjy]

Motivation

can only merge after deepseek-ai/DeepEP#440 is merged

Modifications

Accuracy Tests

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.

[gemini-code-assist]

Summary of Changes

Hello @fzyzcjy, 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 DeepEP token dispatcher by allowing a greater number of tokens to be dispatched per rank. The modification updates an internal assertion limit and a related comment, reflecting an increased capacity for token handling within the distributed system. This change is crucial for supporting larger model operations and ensuring compatibility with recent DeepEP project developments.

Highlights

• Increased Token Dispatch Limit: The maximum number of dispatch tokens allowed per rank for the DeepEP token dispatcher has been increased from 1024 to 2048, enabling larger token transfers.
• DeepEP Alignment: This change aligns with updates in the DeepEP project, specifically referencing a related pull request that increased the FINISHED_SUM_TAG value.

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[gemini-code-assist]

Code Review

This pull request updates the maximum number of dispatch tokens per rank for DeepEP from 1024 to 2048, aligning with an upstream change in the DeepEP library. My review focuses on improving the code's maintainability by refactoring the newly introduced magic number.