Belief Reward Shaping in Reinforcement Learning

Authors

  • Ofir Marom University of the Witwatersrand
  • Benjamin Rosman University of the Witwatersrand, Council for Scientific and Industrial Research

Keywords:

reward shaping, Bayesian statistics

Abstract

A key challenge in many reinforcement learning problems is delayed rewards, which can significantly slow down learning. Although reward shaping has previously been introduced to accelerate learning by bootstrapping an agent with additional information, this can lead to problems with convergence. We present a novel Bayesian reward shaping framework that augments the reward distribution with prior beliefs that decay with experience. Formally, we prove that under suitable conditions a Markov decision process augmented with our framework is consistent with the optimal policy of the original MDP when using the Q-learning algorithm. However, in general our method integrates seamlessly with any reinforcement learning algorithm that learns a value or action-value function through experience. Experiments are run on a gridworld and a more complex backgammon domain that show that we can learn tasks significantly faster when we specify intuitive priors on the reward distribution.

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Published

2018-04-29

How to Cite

Marom, O., & Rosman, B. (2018). Belief Reward Shaping in Reinforcement Learning. Proceedings of the AAAI Conference on Artificial Intelligence, 32(1). Retrieved from https://ojs.aaai.org/index.php/AAAI/article/view/11741