Expectation maximization algorithms for conditional likelihoods

We introduce an expectation maximizationtype (EM) algorithm for maximum likelihood optimization of conditional densities. It is applicable to hidden variable models where the distributions are from the exponential family. The algorithm can alternatively be viewed as automatic step size selection for gradient ascent, where the amount of computation is traded off to guarantees that each step increases the likelihood. The tradeoff makes the algorithm computationally more feasible than the earlier conditional EM. The method gives a theoretical basis for extended Baum Welch algorithms used in discriminative hidden Markov models in speech recognition, and compares favourably with the current best method in the experiments.

• Type: Conference
• Year: 2005
• Where: ICML
• Authors: Jarkko Salojärvi, Kai Puolamäki, Samuel Kaski
• Keywords: Discriminative Hidden Markov, Earlier Conditional Em, ICML 2005, Machine Learning, Maximum Likelihood Optimization