Review on Parameter Estimation in HMRF
This is an incremental review paper for researchers working with statistical models in machine learning.
This technical report reviews parameter estimation methods for Hidden Markov Random Fields (HMRFs), including Metropolis-Hastings algorithms for Ising models and MAP/EM approaches for Gaussian HMRFs, with experimental results demonstrating their application.
This is a technical report which explores the estimation methodologies on hyper-parameters in Markov Random Field and Gaussian Hidden Markov Random Field. In first section, we briefly investigate a theoretical framework on Metropolis-Hastings algorithm. Next, by using MH algorithm, we simulate the data from Ising model, and study on how hyper-parameter estimation in Ising model is enabled through MCMC algorithm using pseudo-likelihood approximation. Following section deals with an issue on parameters estimation process of Gaussian Hidden Markov Random Field using MAP estimation and EM algorithm, and also discusses problems, found through several experiments. In following section, we expand this idea on estimating parameters in Gaussian Hidden Markov Spatial-Temporal Random Field, and display results on two performed experiments.