[edit]
Bounded Approximate Symbolic Dynamic Programming for Hybrid MDPs
Proceedings of the 29th Conference on Uncertainty in Artificial Intelligence, PMLR R11:232-241, 2013.
Abstract
Recent advances in symbolic dynamic pro- gramming (SDP) combined with the ex- tended algebraic decision diagram (XADD) data structure have provided exact solutions for mixed discrete and continuous (hybrid) MDPs with piecewise linear dynamics and continuous actions. Since XADD-based ex- act solutions may grow intractably large for many problems, we propose a bounded er- ror compression technique for XADDs that involves the solution of a constrained bilin- ear saddle point problem. Fortuitously, we show that given the special structure of this problem, it can be expressed as a bilevel lin- ear programming problem and solved to op- timality in finite time via constraint gener- ation, despite having an infinite set of con- straints. This solution permits the use of efficient linear program solvers for XADD compression and enables a novel class of bounded approximate SDP algorithms for hybrid MDPs that empirically offers order-of- magnitude speedups over the exact solution in exchange for a small approximation error.