feat: reward-gated length shaping for correct rollouts#2169
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feat: reward-gated length shaping for correct rollouts#2169
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Replace GR³ multiplicative length scaling (applied to all rollouts, gated on online difficulty filtering) with a simpler approach: attenuate correct rollout rewards by L_min/L_i, where L_min is the shortest correct completion per problem. Incorrect rollouts are untouched. - No hyperparameter needed (was `length_shaping_alpha`, now `length_shaping: bool`) - No dependency on online difficulty filtering - Shortest correct rollout keeps reward=1, longer ones get proportionally less Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
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…", "gr3") Both length shaping strategies are now available via a single config field: - length_shaping = "off" (default): no length shaping - length_shaping = "brevity_bonus": reward-gated L_min/L_i (correct rollouts only) - length_shaping = "gr3": GR³ multiplicative (1 + alpha * L_i/L_mean)^-1 (all rollouts) length_shaping_alpha controls the GR³ coefficient (default 0.33, only used with "gr3"). Replaces the old length_shaping_alpha-only API and removes the ODF coupling. Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
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Summary
L_min / L_i, whereL_minis the shortest correct completion per problemlength_shaping_alpha: floatin favor oflength_shaping: bool(no hyperparameter needed) and drop the online difficulty filtering requirementBreaking changes
orchestrator.advantage.length_shaping_alpha→orchestrator.advantage.length_shaping(float|None → bool)length_shapingno longer requiresonline_difficulty_filtering = true🤖 Generated with Claude Code