Polyglot is a language identifier for detecting text documents containing text written in more than one language, and for identifying the languages therein. It is an experimental project. For monolingual language detection, langid.py[1] is a proven off-the-shelf solution. The theoretical motivation behind it is described in "Automatic Detection and Language Identification of Multilingual Documents. Marco Lui, Jey Han Lau, Timothy Baldwin. TACL Vol 2 (2014)" [2]. To re-train polyglot on custom data, use the training tools for langid.py [1] to build a model, and convert it to polyglot's format using the script in ./polyglot/convert.py Marco Lui <saffsd@gmail.com>, November 2013 [1] https://github.com/saffsd/langid.py [2] https://tacl2013.cs.columbia.edu/ojs/index.php/tacl/article/view/86