Data driven number-of-states selection in HMM topologies
نویسنده
چکیده
In this paper we discuss a data driven approach to select better phone model topologies, in particular to decide on the number of states for linear left-right continuous HMMs. The novel approach is based on a conditional probabilistic viterbi path estimation and operates on forward-backward trained multiple parallel-path HMMs consisting of two different topologies. We compare this conditional probabilistic viterbi path estimation with systematic, statistical and knowledge based designs of different monophone based continuous HMM topologies and evaluate them in a LVSRS system with speech data from the German Verbmobil corpus. We obtained a 5.8% of WER reduction compared to a system with uniform three-state length topologies and a 1.8% WER reduction compared with results of a knowledge based approach with heterogeneous selection of emitting HMM states.
منابع مشابه
A Successive State Splitting Algorithm Based on the Mdl Criterion by Data-driven and Decision Tree Clustering
We propose a new Successive State Splitting (SSS) algorithm based on the Minimum Description Length (MDL) criterion to design tied-state HMM topologies automatically. The SSS algorithm is a mechanism for creating both temporal and contextual variations based on the Maximum Likelihood (ML) criterion. However, it also needs to empirically predetermine control parameters for use as stop criteria, ...
متن کاملData Driven Profiling of Dynamic System Behavior using Hidden Markov Model based Combined Unsupervised and Supervised Classification
Dynamic systems are often best characterized by a combination of static and temporal features, with the static features describing time-invariant properties of the system, and the temporal features capturing dynamic aspects of the system. Our goal is to construct context based temporal behavior models of dynamic systems using information from both types of features. Our dynamic system profiling...
متن کاملOptimal Combined and Adaptive Protection of Active Distribution Networks Considering Different System Topologies Incorporating Optimal Selection of Standard Relay Curves
The change in the topology of active distribution networks (ADNs) is one of the essential challenges that might affect the protection schemes. The conventional protection schemes based on base topology result in some coordination constraint violations in other topologies due to the outage of upstream substations and distributed generation units. In this article, new combinational and adaptive p...
متن کاملData-driven extensions to HMM statistical dependencies
In this paper, a new technique is introduced that relaxes the HMM conditional independence assumption in a principled way. Without increasing the number of states, the modeling power of an HMM is increased by including only those additional probabilistic dependencies (to the surrounding observation context) that are believed to be both relevant and discriminative. Conditional mutual information...
متن کاملPhylogenetic inference under recombination using Bayesian stochastic topology selection
MOTIVATION Conventional phylogenetic analysis for characterizing the relatedness between taxa typically assumes that a single relationship exists between species at every site along the genome. This assumption fails to take into account recombination which is a fundamental process for generating diversity and can lead to spurious results. Recombination induces a localized phylogenetic structure...
متن کامل