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optimality equation decodedPPO clipped surrogate objective decodedRing all-reduce communication volume decodedAutoregressive sequence log-likelihood decodedVariational autoencoder ELBO decodedDiffusion forward-process marginal decodedMulti-head attention shape flow decodedLayerNorm and RMSNorm decodedLLM serving latency decomposition decodedDirect preference optimization loss decodedVAE reparameterized latent sample decodedDiffusion noise-prediction objective decodedRoPE relative-position rotation decodedTop-k mixture-of-experts routing decodedRow-parallel tensor communication decoded