Modeling image patches with a directed hierarchy of Markov random fields Simon Osindero & Geoffrey Hinton · A new learning algorithm for a directed hierarchy of MRF's. Undirected Connections Poster ID M56 · MRF's in the hidden layers allow it to model image patches very well. · The learning algorithm is efficient and scalable because it learns one hidden layer at a time. · Inference in the learned model is very fast and simple. Hidden MRF Directed Connections Hidden MRF Directed Connections Data