OPSD functions primarily as a compression stage after RLVR in mathematical reasoning, preserving accuracy on correct rollouts but reducing it on incorrect ones, supporting a SFT-then-RLVR-then-OPSD pipeline.
- Use **Stirling numbers of the second kind**, summing $ S(4, 1) + S(4, 2) + S(4, 3) $ to account for all groupings
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OPSD Compresses What RLVR Teaches: A Post-RL Compaction Stage for Reasoning Models
OPSD functions primarily as a compression stage after RLVR in mathematical reasoning, preserving accuracy on correct rollouts but reducing it on incorrect ones, supporting a SFT-then-RLVR-then-OPSD pipeline.