Dynamic Bayesian network
Encyclopedia
A dynamic Bayesian network is a Bayesian network
that represents sequences of variables. These sequences are often time-series (for example, in speech recognition
) or sequences of symbols (for example, protein
sequences). The hidden Markov model
can be considered as a simple dynamic Bayesian network.
Bayesian network
A Bayesian network, Bayes network, belief network or directed acyclic graphical model is a probabilistic graphical model that represents a set of random variables and their conditional dependencies via a directed acyclic graph . For example, a Bayesian network could represent the probabilistic...
that represents sequences of variables. These sequences are often time-series (for example, in speech recognition
Speech recognition
Speech recognition converts spoken words to text. The term "voice recognition" is sometimes used to refer to recognition systems that must be trained to a particular speaker—as is the case for most desktop recognition software...
) or sequences of symbols (for example, protein
Protein
Proteins are biochemical compounds consisting of one or more polypeptides typically folded into a globular or fibrous form, facilitating a biological function. A polypeptide is a single linear polymer chain of amino acids bonded together by peptide bonds between the carboxyl and amino groups of...
sequences). The hidden Markov model
Hidden Markov model
A hidden Markov model is a statistical Markov model in which the system being modeled is assumed to be a Markov process with unobserved states. An HMM can be considered as the simplest dynamic Bayesian network. The mathematics behind the HMM was developed by L. E...
can be considered as a simple dynamic Bayesian network.
Software
- http://code.google.com/p/bnt/ The BNT toolbox by Kevin Murphy
- http://code.google.com/p/bnt/ DBmcmc - Inferring Dynamic Bayesian Networks with MCMC
- http://code.google.com/p/globalmit/ GlobalMIT Matlab toolbox - Modeling gene regulatory network via global optimization of dynamic bayesian network