MuZero matches or exceeds AlphaZero-level performance in Go, Chess, Shogi and sets a new state of the art on 57 Atari games by learning a model that directly supports planning rather than reconstructing full environment dynamics.
Observe and Look Further: Achieving Consistent Performance on Atari
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abstract
Despite significant advances in the field of deep Reinforcement Learning (RL), today's algorithms still fail to learn human-level policies consistently over a set of diverse tasks such as Atari 2600 games. We identify three key challenges that any algorithm needs to master in order to perform well on all games: processing diverse reward distributions, reasoning over long time horizons, and exploring efficiently. In this paper, we propose an algorithm that addresses each of these challenges and is able to learn human-level policies on nearly all Atari games. A new transformed Bellman operator allows our algorithm to process rewards of varying densities and scales; an auxiliary temporal consistency loss allows us to train stably using a discount factor of $\gamma = 0.999$ (instead of $\gamma = 0.99$) extending the effective planning horizon by an order of magnitude; and we ease the exploration problem by using human demonstrations that guide the agent towards rewarding states. When tested on a set of 42 Atari games, our algorithm exceeds the performance of an average human on 40 games using a common set of hyper parameters. Furthermore, it is the first deep RL algorithm to solve the first level of Montezuma's Revenge.
fields
cs.LG 2years
2019 2representative citing papers
Attention mechanism dynamically groups task knowledge at state granularity in multi-task DRL to enable positive transfer and avoid negative transfer, matching or exceeding prior methods with fewer parameters.
citing papers explorer
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Mastering Atari, Go, Chess and Shogi by Planning with a Learned Model
MuZero matches or exceeds AlphaZero-level performance in Go, Chess, Shogi and sets a new state of the art on 57 Atari games by learning a model that directly supports planning rather than reconstructing full environment dynamics.
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Attentive Multi-Task Deep Reinforcement Learning
Attention mechanism dynamically groups task knowledge at state granularity in multi-task DRL to enable positive transfer and avoid negative transfer, matching or exceeding prior methods with fewer parameters.