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nemo-mbridge-perf-expert-parallel-overlap

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Validate and use MoE expert-parallel communication overlap in Megatron-Bridge, including overlap_moe_expert_parallel_comm, delay_wgrad_compute, and flex dispatcher backends such as DeepEP and HybridEP.

skills/nemo-mbridge-perf-expert-parallel-overlap/SKILL.md

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# MoE Expert-Parallel Overlap Skill

## References

- Stable docs: @docs/training/communication-overlap.md
- Structured metadata: @skills/nemo-mbridge-perf-expert-parallel-overlap/card.yaml

## What It Is

Expert-parallel (EP) overlap hides the cost of token dispatch/combine all-to-all
communication by running it concurrently with expert FFN compute. Optionally,
delayed expert weight-gradient computation (`delay_wgrad_compute`) provides
additional overlap by deferring wgrad to overlap with the next layer's forward.