Add a lineage_expert_permutation config option for per-step expert - #5520
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load balancing in the Lineage MoE path. When set to "lpt", the decoder and each MTP layer keep a per-layer routed expert permutation as runtime state (`moe.ExpertPermutationVar`, an `nnx.BatchStat` initialised to the identity), which each forward pass reads and overwrites with the permutation for the next step. Params-only checkpoint loads skip it. The default (None) creates no state and leaves behaviour unchanged. PiperOrigin-RevId: 991959508
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Add a
lineage_expert_permutationconfig option for per-step expertload balancing in the Lineage MoE path.
When set to "lpt", the decoder and each MTP layer keep a per-layer routed
expert permutation as runtime state (
moe.ExpertPermutationVar, annnx.BatchStatinitialised to the identity), which each forward passreads and overwrites with the permutation for the next step. Params-only
checkpoint loads skip it. The default (None) creates no state and leaves
behaviour unchanged.