Hidden Markov models with Baum-Welch algorithm using python

Question

I'm looking for some python implementation (in pure python or wrapping existing stuffs) of HMM and Baum-Welch.

Some ideas?

I've just searched in google and I've found really poor material with respect to other machine learning techniques. Why?

Gael Varoquaux · Answer 1 · 2014-12-06T16:07:49.773

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The scikit-learn has an HMM implementation. It was until recently considered as unmaintained and its usage was discouraged. However it has improved in the development version. I cannot vouch for its quality, though, as I know nothing of HMMs.

Disclaimer: I am a scikit-learn developer.

Edit: we have moved the HMMs outside of scikit-learn, to https://github.com/hmmlearn/hmmlearn

edited Dec 06 '14 at 16:07

answered Mar 10 '12 at 22:54

Gael Varoquaux

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yeah i decide to don't use it because of unmantainement.. – nkint Mar 11 '12 at 18:29
I think that it is improving and that we will soon be able to commit to maintaining it. – Gael Varoquaux Mar 11 '12 at 19:03
does the sklearn implementation use Baum-Welch? – Vishal Sep 24 '12 at 13:03
Yes it does. See [`_BaseHMM`](https://github.com/hmmlearn/hmmlearn/blob/master/hmmlearn/base.py#L96) documentation for implementation details. – Sergei Lebedev Mar 01 '16 at 11:04

score 3 · Answer 2 · edited May 23 '17 at 12:39

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You can find Python implementations on:

Hidden Markov Models in Python - CS440: Introduction to Artifical Intelligence - CSU
Baum-Welch algorithm: Finding parameters for our HMM | Does this make sense?

BTW: See Example of implementation of Baum-Welch on Stack Overflow - the answer turns out to be in Python.

edited May 23 '17 at 12:39

Community

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answered Dec 01 '14 at 21:19

Piotr Migdal

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score 3 · Answer 3 · edited Dec 09 '16 at 15:46

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Have you seen NLTK?

http://www.nltk.org/

It has some classes that are suitable for this sort of thing, but somewhat application dependent.

http://www.nltk.org/api/nltk.tag.html#nltk.tag.hmm.HiddenMarkovModelTrainer

If you are looking for something more 'education oriented', I wrote toy trainer a while ago:

http://pastebin.com/aJG3Ukmn

edited Dec 09 '16 at 15:46

KT12

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answered Jan 19 '12 at 11:21

qi5d02lx

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thanks. i need it for gesture recognition. i'm stucked on what could be my alphabet (symbols in nltk) in my application.. – nkint Jan 19 '12 at 11:40
@nkint Check this out: http://www.ri.cmu.edu/pub_files/pub3/yang_jie_1994_1/yang_jie_1994_1.pdf – qi5d02lx Jan 19 '12 at 11:47
ok the data are the labels so if i use only 8 labels for clusterize the coordinates of a gesture.. alphabet is [1,2,3,4,5,6,7] – nkint Jan 19 '12 at 17:16
but still don't understand the difference between state and symbol in HiddenMarkovModelTrainer constructor – nkint Jan 19 '12 at 18:15
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alright, how about this: http://www.creativedistraction.com/demos/gesture-recognition-kinect-with-hidden-markov-models-hmms/ it's a step-by-step demo with code of how to build your own gesture recognizer with the kinect. code is for Octave not python, but it seems like you are stuck on the ideas/implementation more than the particulars of the software. of course it requires a kinect... you might also check this out: http://code.google.com/p/ehci/ – qi5d02lx Jan 19 '12 at 23:40

score 1 · Answer 4 · answered Aug 29 '12 at 18:55

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Some implementation of basic algorithms (including Baum-welch in python) are available here: http://ai.cs.umbc.edu/icgi2012/challenge/Pautomac/baseline.php

answered Aug 29 '12 at 18:55

Remi

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score 1 · Answer 5 · answered Jan 17 '14 at 20:08

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The General Hidden Markov Model library has python bindings and uses the Baum-Welch algorithm.

answered Jan 17 '14 at 20:08

nairboon

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score 0 · Answer 6 · answered Jan 09 '19 at 20:35

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Following is a Pyhton implementation of Baum-Welch Algorithm:

https://github.com/hamzarawal/HMM-Baum-Welch-Algorithm

answered Jan 09 '19 at 20:35

Hamza Rawal

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Hidden Markov models with Baum-Welch algorithm using python

6 Answers6