Jahmm has a new home!
Jahmm is moving to a new home! Check out the new website:
It's now available under the New BSD license!
Making Jahmm available as a Google Code project brings exciting new features such as a discussion group, a wiki, and a freely available source revision system. This new infrastructure should greatly ease the community feedback and allow Jahmm users to help each other.
All this is great news!
I plan to deprecate this site as soon as all the information available here have been copied to the new website.
This site describes Jahmm (pronounced "jam"), a Java implementation of Hidden Markov Model (HMM) related algorithms. It's been designed to be easy to use (e.g. simple things are simple to program) and general purpose. As it is licenced under GPL; its source code is thus freely available.
This library is reasonably efficient, meaning that the complexity of the implementation of the algorithms involved is that given by the theory. However, when a choice must be made between code readability and efficiency, readability has been chosen. It is thus ideal in research (because algorithms can easily be modified) and as an academic tool (students can quickly get interesting results).
Various algorithms are included in the latest version..
This example shows how to program the library to build a HMM, to generate observation sequences, to use a learning algorithm and to read a data file.
Two interfaces are provided.
The first is a graphical user interface, JahmmViz, which is not using the latest version of the library.
The second (and prefered) user interface is the command-line interface.
Some contributions to the library.
The packages of the latest version are briefly described here.
This page is not intended to be a HMM tutorial. Please refer to the following papers for more information about HMMs:
- Rabiner, Juang, An introduction to Hidden Markov Models, IEEE ASSP Mag., pp 4-16, June 1986
- Juang, Rabiner, The segmental k-means algorithm for estimating the parameters of hidden Markov Models, IEEE Trans. ASSP, vol. 38, no. 9, pp. 1639-1641, Sept. 1990.
- Juang, Rabiner, A Probabilistic distance measure for HMMs, AT&T Technical Journal, vol. 64, no. 2, pp. 391-408, Feb. 1985.
- Juang, Rabiner, Fundamentals of speech recognition, Prentice All, AT&T, 1993.
|Version||Javadoc||User guide||Release date||Comments|
|0.6.1 (sources tar.gz or zip, jar)||Online, tar.gz, zip||pdf html xhtml||April 2006||Minor change; see changelog.|
|0.6.0 (sources tar.gz or zip, jar)||Online, tar.gz, zip||pdf html xhtml||April 2006||Major modifications. Includes a command-line interface.|
|0.5.0 (sources tar.gz or zip, jar)||Online, tar.gz, zip||December 2005||Ported to Java 1.5.0 (finished). Does not include JahmmViz anymore (it will be release separately from now on). Major changes (see the changelog).|
|0.4.1 (sources tar.gz or zip, jar)||Online, tar.gz, zip||January 2006||Backported bugfix to v0.4.0.|
|0.4.0 (sources tar.gz or zip, jar)||Online, tar.gz, zip||November 2005||Porting to Java 1.5.0 (continued).|
|0.3.4 (sources tar.gz or zip, jar)||Online, tar.gz, zip||November 2005||Small bugfix. Included Gaussian mixtures. Begin porting to Java 1.5.0.|
|0.3.3 (sources tar.gz or zip, jar)||Online, tar.gz, zip||March 2005||Last Java 1.4 version of the library. JahmmViz update/small bugfixes.|
|0.3.2 (sources tar.gz or zip, jar)||Online, tar.gz, zip||March 2005||JahmmViz update.|
|0.3.1 (sources tar.gz or zip, jar)||Online, tar.gz, zip||February 2005||Bugfix.|
|0.3.0 (sources tar.gz or zip, jar)||Online, tar.gz, zip||January 2005||Added the JahmmViz GUI.|