rlvr

Everything on Ground Truth tagged “rlvr” — 2 items.

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.