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Simple random search provides a competitive approach to reinforcement learning (arxiv.org)
1 point by jonbaer on Jun 25, 2018 | hide | past | pdf | discuss on HN

In plain words: Instead of exploring actions step by step, it randomly tweaks a simple controller's settings and keeps the changes that raise the reward. On standard continuous-control tasks it matched the best sample efficiency while running at least 15 times faster than the quickest competing approach.

Abstract

A common belief in model-free reinforcement learning is that methods based on random search in the parameter space of policies exhibit significantly worse sample complexity than those that explore the space of actions. We dispel such beliefs by introducing a random search method for training static, linear policies for continuous control problems, matching state-of-the-art sample efficiency on the benchmark MuJoCo locomotion tasks. Our method also finds a nearly optimal controller for a challenging instance of the Linear Quadratic Regulator, a classical problem in control theory, when the dynamics are not known. Computationally, our random search algorithm is at least 15 times more efficient than the fastest competing model-free methods on these benchmarks. We take advantage of this computational efficiency to evaluate the performance of our method over hundreds of random seeds and many different hyperparameter configurations for each benchmark task. Our simulations highlight a high variability in performance in these benchmark tasks, suggesting that commonly used estimations of sample efficiency do not adequately evaluate the performance of RL algorithms.

Horia Mania, Aurelia Guy, Benjamin Recht
arXiv:1803.07055 · cs.LG, cs.AI, math.OC, stat.ML · submitted Mar 19, 2018
abstract · pdf · html · 22 pages, 5 figures, 9 tables

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