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online cognacy identification

This repository accompanies the paper Fast and unsupervised methods for multilingual cognate clustering by Rama, Wahle, Sofroniev, and Jäger. The repository contains both the data and the source code used in the paper's experiments.


The code is developed using Python 3.5 but later versions should also do as long as the dependencies are satisfied.

# clone this repository
git clone
cd online_cognacy_ident

# you do not need to create a virtual environment if you know what you are
# doing; remember that the code is written in python3
virtualenv meta/venv
source meta/venv/bin/activate

# install the dependencies
# it is important to use the versions specified in the requirements file
pip install -r requirements.txt

# check the unit tests
python -m unittest discover online_cognacy_ident

If you run into difficulties, please make sure you have tried the setup in a fresh virtual environment before opening an issue.

windows users

Installing python-igraph on Windows may not work via pip install python-igraph. Please use the appropriate windows binaries from Christoph Gohlkes' site.


# activate the virtual env if it is not already
source meta/venv/bin/activate

# ensure the reproducibility of the results

# use to train models
python --help

# use to apply trained models on datasets
python --help

# use to evaluate the algorithms' output
python --help

A dataset should be in csv format. You can specify the csv dialect using the --dialect-input option, possible values are excel, excel-tab, and unix. If this is omitted, the script will try to guess the dialect by looking at the file extension.

A dataset should have a header with at least the following columns: doculect or language, concept or gloss, and asjp or transcription. Column name detection is case-insensitive. If there are two or more words tied to a single gloss in a given doculect, all but the first are ignored.


The datasets used in the paper's experiments can be found in the datasets directory.

dataset language families transcription source
abvd Austronesian ipa Greenhill et al, 2008
afrasian Afro-Asiatic asjp Militarev, 2000
bai Sino-Tibetan ipa Wang, 2006
chinese_1964 Sino-Tibetan ipa Běijīng Dàxué, 1964
chinese_2004 Sino-Tibetan ipa Hóu, 2004
huon Trans-New Guinea asjp McElhanon, 1967
ielex Indo-European ipa Dunn, 2012
japanese Japonic ipa Hattori, 1973
kadai Tai-Kadai asjp Peiros, 1998
kamasau Torricelli asjp Sanders, 1980
lolo_burmese Sino-Tibetan asjp Peiros, 1998
mayan Mayan asjp Brown, 2008
miao_yao Hmong-Mien asjp Peiros, 1998
mixe_zoque Mixe-Zoque asjp Cysouw et al, 2006
mon_khmer Austroasiatic asjp Peiros, 1998
ob_ugrian Uralic ipa Zhivlov, 2011
tujia Sino-Tibetan ipa Starostin, 2013

Please note that you should use the --ipa flag when running the algorithms on any IPA-transcribed dataset, including the ones found in the datasets dir.

If you have fish shell installed, you could invoke ./ which runs both algorithms on all the datasets, saves the results in the output dir and prints the evaluation scores to stdout.


The datasets are published under a Creative Commons Attribution-ShareAlike 4.0 International License. The source code is published under the MIT License (see the LICENSE file).


Fast and unsupervised methods for multilingual cognate clustering (Rama, Wahle, Sofroniev, and Jäger)







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