LSTD with Random Projections

We consider the problem of reinforcement learning in high-dimensional spaces when the number of features is bigger than the number of samples. In particular, we study the least-squares temporal difference (LSTD) learning algorithm when a space of low dimension is generated with a random projection from a high-dimensional space. We provide a thorough theoretical analysis of the LSTD with random projections and derive performance bounds for the resulting algorithm. We also show how the error of LSTD with random projections is propagated through the iterations of a policy iteration algorithm and provide a performance bound for the resulting least-squares policy iteration (LSPI) algorithm.

Channel: VideoLectures Video Length: 0s Date Found: Sat, Mar 26 2011 11:27 AM Category: Educational Date Produced: Fri, Mar 25 2011 3:00 AM View Count: 0