Samuel meets Amarel: automating value function approximation using global state space analysis

  • Authors:
  • Sridhar Mahadevan

  • Affiliations:
  • Department of Computer Science, University of Massachusetts, Amherst, MA

  • Venue:
  • AAAI'05 Proceedings of the 20th national conference on Artificial intelligence - Volume 2
  • Year:
  • 2005

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Abstract

Most work on value function approximation adheres to Samuel's original design: agents learn a task-specific value function using parameter estimation, where the approximation architecture (e.g, polynomials) is specified by a human designer. This paper proposes a novel framework generalizing Samuel's paradigm using a coordinate-free approach to value function approximation. Agents learn both representations and value functions by constructing geometrically customized task-independent basis functions that form an orthonormal set for the Hilbert space of smooth functions on the underlying state space manifold. The approach rests on a technical result showing that the space of smooth functions on a (compact) Riemanian manifold has a discrete spectrum associated with the Laplace-Beltrami operator. In the discrete setting, spectral analysis of the graph Laplacian yields a set of geometrically customized basis functions for approximating and decomposing value functions. The proposed framework generalizes Samuel's value function approximation paradigm by combining it with a formalization of Saul Amarel's paradigm of representation learning through global state space analysis.