Reinforcement Learning for Continuous Stochastic Actions--An Approximation of Probability Density Function by Orthogonal Wave Function Expansion--

Hideki SATOH

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Summary :

A function approximation based on an orthonormal wave function expansion in a complex space is derived. Although a probability density function (PDF) cannot always be expanded in an orthogonal series in a real space because a PDF is a positive real function, the function approximation can approximate an arbitrary PDF with high accuracy. It is applied to an actor-critic method of reinforcement learning to derive an optimal policy expressed by an arbitrary PDF in a continuous-action continuous-state environment. A chaos control problem and a PDF approximation problem are solved using the actor-critic method with the function approximation, and it is shown that the function approximation can approximate a PDF well and that the actor-critic method with the function approximation exhibits high performance.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E89-A No.8 pp.2173-2180
Publication Date
2006/08/01
Publicized
Online ISSN
1745-1337
DOI
10.1093/ietfec/e89-a.8.2173
Type of Manuscript
PAPER
Category
Nonlinear Problems

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