Authors: Brkljač, Branko
Janev, Marko 
Obradović, Radovan
Rapaić, Danilo
Ralević, Nebojša
Crnojević, Vladimir
Title: Sparse representation of precision matrices used in GMMs
Journal: Applied Intelligence
Volume: 41
Issue: 3
First page: 956
Last page: 973
Issue Date: 18-Sep-2014
ISSN: 0924-669X
DOI: 10.1007/s10489-014-0581-6
Abstract: 
The paper presents a novel precision matrix modeling technique for Gaussian Mixture Models (GMMs), which is based on the concept of sparse representation. Representation coefficients of each precision matrix (inverse covariance), as well as an accompanying overcomplete matrix dictionary, are learned by minimizing an appropriate functional, the first component of which corresponds to the sum of Kullback-Leibler (KL) divergences between the initial and the target GMM, and the second represents the sparse regularizer of the coefficients. Compared to the existing, alternative approaches for approximate GMM modeling, like popular subspace-based representation methods, the proposed model results in notably better trade-off between the representation error and the computational (memory) complexity. This is achieved under assumption that the training data in the recognition system utilizing GMM have an inherent sparseness property, which enables application of the proposed model and approximate representation using only one dictionary and a significantly smaller number of coefficients. Proposed model is experimentally compared with the Subspace Precision and Mean (SPAM) model, a state of the art instance of subspace-based representation models, using both the data from a real Automatic Speech Recognition (ASR) system, and specially designed sets of artificially created/synthetic data.
Keywords: Gaussian mixtures | Pattern classification | Precision matrix | Sparse representation | Speech recognition | ℓ −regularization 1
Publisher: Springer Link
Project: Integrated system for detection and estimation of fire development by real-time monitoring of critical parameters 
Biosensing Technologies and Global System for Long-Term Research and Integrated Management of Ecosystems 
Development of Dialogue Systems for Serbian and Other South Slavic Languages 

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