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arXiv 2005.03718cs.LGeess.SPmath.OCstat.ML
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约束马尔可夫决策过程的一种主动搜索算法

A Gradient-Aware Search Algorithm for Constrained Markov Decision Processes

Illinois Institute of Technology(伊利诺伊理工学院);Argonne National Laboratory(阿贡国家实验室)

Sami Khairy, Prasanna Balaprakash, Lin X. Cai

摘要:

有限约束马尔可夫决策过程(CMDPs)的规范求解方法是基于凸线性规划的,其目标是在期望的无限时域贴现成本约束下最大化期望的无限时域贴现报酬.本文首先证明了有限CMDP对偶线性规划的优化目标是关于Lagrange罚乘子的分段线性凸函数。接下来,我们提出了一种新的两级感知搜索(GAS)算法,该算法利用PWLC结构来找到有限CMDP的最佳状态价值函数和拉格朗日罚乘子。该算法被应用于两个随机控制问题的约束:机器人导航在网格世界和太阳能无人机(UAV)的无线网络管理。我们经验比较建议的GAS算法与二叉搜索(BS),拉格朗日原对偶优化(PDO),线性规划(LP)的收敛性能。与基准算法相比,该算法收敛速度更快,不需要超参数调整,对Lagrange罚乘子的初始化不敏感.

英文摘要:

The canonical solution methodology for finite constrained Markov decision processes (CMDPs), where the objective is to maximize the expected infinite-horizon discounted rewards subject to the expected infinite-horizon discounted costs constraints, is based on convex linear programming. In this brief, we first prove that the optimization objective in the dual linear program of a finite CMDP is a piece-wise linear convex function (PWLC) with respect to the Lagrange penalty multipliers. Next, we propose a novel two-level Gradient-Aware Search (GAS) algorithm which exploits the PWLC structure to find the optimal state-value function and Lagrange penalty multipliers of a finite CMDP. The proposed algorithm is applied in two stochastic control problems with constraints: robot navigation in a grid world and solar-powered unmanned aerial vehicle (UAV)-based wireless network management. We empirically compare the convergence performance of the proposed GAS algorithm with binary search (BS), Lagrangian primal-dual optimization (PDO), and Linear Programming (LP). Compared with benchmark algorithms, it is shown that the proposed GAS algorithm converges to the optimal solution faster, does not require hyper-parameter tuning, and is not sensitive to initialization of the Lagrange penalty multiplier.

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