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|Title:||Maximum Entropy Discrimination Factor Analyzers||Authors:||Chatzis, Sotirios P.||Keywords:||Large-margin modeling;Maximum-entropy discrimination;Mean-field inference;Latent variable representation;Factor analyzers||Category:||Electrical Engineering - Electronic Engineering - Information Engineering||Field:||Engineering and Technology||Issue Date:||2016||Publisher:||Elsevier Science Limited||Source:||Neurocomputing, 2016||Abstract:||Devising generative models that allow for inferring low dimensional latent fea- ture representations of high-dimensional observations is a significant problem in statistical machine learning. Factor analysis (FA) is a well-established lin- ear latent variable scheme addressing this problem by modeling the covariances between the elements of multivariate observations under a set of linear assump- tions. FA is closely related to principal components analysis (PCA), and might be considered as a generalization of both PCA and its probabilistic version, PPCA. Recently, the invention of Gaussian process latent variable models (GP- LVMs) has given rise to a whole new family of latent variable modeling schemes that generalize FA under a nonparametric Bayesian inference framework. In this work, we examine generalization of FA models under a different Bayesian inference perspective. Specifically, we propose a large-margin formulation of FA under the maximum entropy discrimination (MED) framework. The MED framework integrates the large-margin principle with Bayesian posterior infer- ence in an elegant and computationally efficient fashion, allowing to leverage existing high-performance solvers for convex optimization problems. We devise efficient mean-field inference algorithms for our model, and exhibit its advan- tages by evaluating it in a number of diverse application scenarios, dealing with high-dimensional data classification and reconstruction.||URI:||http://ktisis.cut.ac.cy/handle/10488/8574||ISSN:||0925-2312
|Rights:||Copyright © Elsevier B.V||Type:||Article|
|Appears in Collections:||Άρθρα/Articles|
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