Definition
Plain language
A small grid-world test environment that's a staple of reinforcement learning research.
As stated in the literature
A canonical Gymnasium grid-world environment used as a teaching and testing benchmark for RL algorithms.
Why it matters: It's a minimal, fast, and reproducible sandbox for sanity-checking RL algorithms before scaling them to real problems.
For example, in FrozenLake an agent has to navigate a four-by-four grid of safe and slippery tiles to reach a goal without falling into holes.
Heard on the show
“The headline cells are dramatic — sixteen points on Sokoban with PPO, and on the vision-language version of FrozenLake there's a gain of nearly sixty points.”Episode 010 — When Reward Climbs But Reasoning Goes Generic: Diagnosing Template Collapse in Agentic RL