Enable Mooncake as the --moe-a2a-backend on CI

[UNIDY2002]

Motivation

The Mooncake's a2a implementations (i.e. the dispatch & combine primitives) have not been enabled on CI.

This PR sets --moe-a2a-backend to mooncake to ensure better test coverage.

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 @UNIDY2002, 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 focuses on integrating the Mooncake A2A backend into the continuous integration (CI) testing environment. The primary goal is to expand test coverage for Mooncake's dispatch and combine primitives, ensuring their robust operation. The changes involve updating test configurations to utilize the new backend, along with minor code adjustments and test parameter tuning to facilitate this integration.

Highlights

• CI Backend Enablement: Enabled Mooncake as the --moe-a2a-backend in the CI test configuration to improve test coverage for its dispatch and combine primitives.
• Function Signature Update: Modified the combine_b method in mooncake.py to accept an additional overlap_args parameter.
• Test Configuration Adjustments: Updated test_mooncake_ep_small.py to use the mooncake backend, disable CUDA graph, and adjust test parameters like num_questions, max_new_tokens, and the accuracy assertion threshold for test_gsm8k.
• Test Skipping and Typo Fix: Added a skip decorator to TestNoGatherdBuffer and corrected a typo in the class name TestMooncakeWitchEPLB to TestMooncakeWithEPLB.

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[gemini-code-assist]

Code Review

This pull request enables the Mooncake all-to-all backend on CI, which is a good step for improving test coverage. My review focuses on a few points: an unused parameter in the mooncake dispatcher, the disabling of CUDA graphs in the test suite which could have performance implications, and the weakening of test parameters which might reduce test rigor. I've provided suggestions to improve code clarity and raised questions about the potential performance and testing trade-offs.