rlvr
Everything on Ground Truth tagged “rlvr” — 3 items.
New RLVR paper shows how a verifier can reward progress while true correctness falls News
Verifier Errors in RLVR formalizes a reward-hacking problem: an imperfect checker can make training look better while the task’s actual correctness deteriorates, and visible logs may not reveal the error.
Policy entropy: when reinforcement learning makes an AI less willing to try another good path Lesson
Policy entropy measures how spread out an AI’s action probabilities are; it matters because reward training can improve the most likely answer while quietly collapsing useful alternative solution paths.
Reinforcement Learning with Verifiable Rewards (RLVR) Lesson
RLVR trains a language model by rewarding answers that an automatic checker can confirm are correct - a passing unit test, a right final number, a valid proof - instead of using human ratings or a learned reward model. It is the training recipe behind the modern wave of reasoning models.