vLLM V0 to V1: Correctness Before Corrections in RL
The post describes the migration of vLLM from V0 to V1 for RL rollout generation. It identifies four failure modes (processed logprobs, runtime defaults, weight-update path, fp32 lm_head) that caused train-inference mismatch. After fixes, V1 matches V0 reference across clip rate, KL, entropy, and reward metrics.
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