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laoyao0822 50fde834ae Keep CP compute padding out of sparse MoE
CP shared-KV compute padding creates per-request lane slots, so valid rows are not a simple prefix/suffix mask. DeepEP MoE was still seeing dummy rows and using scalar non-padded semantics, which let padding participate in gate/topk and corrupted cache-hit tiny-extend inference.\n\nThe fix compacts CP-local valid rows before MoE dispatch and restores the compact output back to the compute-padded row layout before downstream layer communication. The local GSM8K investigation ledger is now removed from the tracked tree and ignored so future debug notes stay local.\n\nConstraint: CP shared-KV compute-padding layout must keep downstream communicator shapes stable.\nRejected: Disable bs>1/current reuse/cache-hit fast paths | hides the semantic bug and loses the intended performance path.\nRejected: Use num_token_non_padded for MoE under compute padding | valid rows are interleaved with dummy lane slots, not suffix-padded.\nConfidence: high\nScope-risk: moderate\nDirective: Do not feed compute-padded dummy rows into sparse MoE gate/topk; compact valid rows at the MoE boundary and restore shape afterward.\nTested: python -m py_compile python/sglang/srt/layers/attention/nsa/utils.py python/sglang/srt/models/deepseek_v2.py\nTested: remote focused CP utils tests passed, 4 tests.\nTested: remote GSM8K 50-question smoke accuracy 0.960; 200-question runs accuracy 0.955 and 0.965; full 1319-question run accuracy 0.952.\nNot-tested: Long-running production traffic beyond GSM8K after this commit.
2026-06-09 01:48:24 +08:00

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