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Simple Python/Cython interface to kaldi-asr nnet3/chain and gmm decoders

Project description

# py-kaldi-asr

Some simple wrappers around kaldi-asr intended to make using kaldi's online nnet3-chain
decoders as convenient as possible. Kaldi's online GMM decoders are also supported.

Target audience are developers who would like to use kaldi-asr as-is for speech
recognition in their application on GNU/Linux operating systems.

Constructive comments, patches and pull-requests are very welcome.

Getting Started

We recommend using pre-trained modules from the [zamia-speech]( project
to get started. There you will also find a tutorial complete with links to pre-built binary packages
to get you up and running with free and open source speech recognition in a matter of minutes:

[Zamia Speech Tutorial](

Example Code

Simple wav file decoding:

from kaldiasr.nnet3 import KaldiNNet3OnlineModel, KaldiNNet3OnlineDecoder

MODELDIR = 'data/models/kaldi-generic-en-tdnn_sp-latest'
WAVFILE = 'data/dw961.wav'

kaldi_model = KaldiNNet3OnlineModel (MODELDIR)
decoder = KaldiNNet3OnlineDecoder (kaldi_model)

if decoder.decode_wav_file(WAVFILE):

s, l = decoder.get_decoded_string()

print u"*****************************************************************"
print u"**", WAVFILE
print u"**", s
print u"** %s likelihood:" % MODELDIR, l
print u"*****************************************************************"


print "***ERROR: decoding of %s failed." % WAVFILE

Please check the examples directory for more example code.


* Python 2.7 or 3.5
* NumPy
* Cython
* [kaldi-asr]( "")

Setup Notes


At the time of this writing kaldi-asr does not seem to have an official way to
install it on a system.

So, for now we will rely on pkg-config to provide LIBS and CFLAGS for compilation:
Create a file called `kaldi-asr.pc` somewhere in your `PKG_CONFIG_PATH` that provides
this information:


Name: kaldi-asr
Description: kaldi-asr speech recognition toolkit
Version: 5.2
Requires: atlas
Libs: -L${kaldi_root}/tools/openfst/lib -L${kaldi_root}/src/lib -lkaldi-decoder -lkaldi-lat -lkaldi-fstext -lkaldi-hmm -lkaldi-feat -lkaldi-transform -lkaldi-gmm -lkaldi-tree -lkaldi-util -lkaldi-matrix -lkaldi-base -lkaldi-nnet3 -lkaldi-online2 -lkaldi-cudamatrix -lkaldi-ivector -lfst
Cflags: -I${kaldi_root}/src -I${kaldi_root}/tools/openfst/include

make sure `kaldi_root` points to wherever your kaldi checkout lives in your filesystem.


You may need to install ATLAS headers even if you didn't need them to compile Kaldi.

$ sudo apt install libatlas-dev


My own code is Apache licensed unless otherwise noted in the script's copyright

Some scripts and files are based on works of others, in those cases it is my
intention to keep the original license intact. Please make sure to check the
copyright headers inside for more information.


Guenter Bartsch <><br/>
Kaldi 5.1 adaptation contributed by mariasmo<br/>
Kaldi GMM model support contributed by David Zurow<br/>

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