AI learns to play video game from instructions in plain English

An AI has learned to tackle one of the toughest Atari videogames by taking instructions in plain English. The system, developed by a team at Stanford University in California, learned to play the game Montezuma's Revenge, in which players scour an Aztec temple for treasure. The game is challenging for AI to learn because it offers sparse rewards, requiring players to make several moves before earning any points. Most videogame-playing AIs use reinforcement learning to develop a strategy, relying on feedback like game points to tell them when they are playing well. To help their AI pick up game tactics quicker, the Stanford team gave their reinforcement learning system a helping hand in the form of natural language instructions, for example advising it to "climb up the ladder" or "get the key".