From semantics to execution: Integrating action planning with reinforcement learning for robotic causal problem-solving
Abstract
Reinforcement learning is an appropriate and successful method to robustly perform low-level robot control under noisy conditions. Symbolic action planning is useful to resolve causal dependencies and to break a causally complex problem down into a sequence of simpler high-level actions. A problem with the integration of both approaches is that action planning is based on discrete high-level action- and state spaces, whereas reinforcement learning is usually driven by a continuous reward function. However, recent advances in reinforcement learning, specifically, universal value function approximators and hindsight experience replay, have focused on goal-independent methods based on sparse rewards. In this article, we build on these novel methods to facilitate the integration of action planning with reinforcement learning by exploiting the reward-sparsity as a bridge between the high-level and low-level state- and control spaces. As a result, we demonstrate that the integrated neuro-symbolic method is able to solve object manipulation problems that involve tool use and non-trivial causal dependencies under noisy conditions, exploiting both data and knowledge.
Cite
@article{arxiv.1905.09683,
title = {From semantics to execution: Integrating action planning with reinforcement learning for robotic causal problem-solving},
author = {Manfred Eppe and Phuong D. H. Nguyen and Stefan Wermter},
journal= {arXiv preprint arXiv:1905.09683},
year = {2019}
}