Linear combination of one-step predictive information with an external reward in an episodic policy gradient setting: a critical analysis

Keyan Zahedi, Georg Martius, Nihat Ay
2013 Frontiers in Psychology  
One of the main challenges in the field of embodied artificial intelligence is the open-ended autonomous learning of complex behaviors. Our approach is to use task-independent, information-driven intrinsic motivation(s) to support task-dependent learning. The work presented here is a preliminary step in which we investigate the predictive information (the mutual information of the past and future of the sensor stream) as an intrinsic drive, ideally supporting any kind of task acquisition.
more » ... us experiments have shown that the predictive information (PI) is a good candidate to support autonomous, open-ended learning of complex behaviors, because a maximization of the PI corresponds to an exploration of morphology-and environment-dependent behavioral regularities. The idea is that these regularities can then be exploited in order to solve any given task. Three different experiments are presented and their results lead to the conclusion that the linear combination of the one-step PI with an external reward function is not generally recommended in an episodic policy gradient setting. Only for hard tasks a great speed-up can be achieved at the cost of an asymptotic performance lost. Keywords: information-driven self-organization, predictive information, reinforcement learning, embodied artificial intelligence, embodied machine learning www.frontiersin.org November 2013 | Volume 4 | Article 801 | 1 Zahedi et al. One-step PI and episodic RL
doi:10.3389/fpsyg.2013.00801 pmid:24204351 pmcid:PMC3816314 fatcat:oi5bhb7zqfhirkfnj5qvixsxlq