NGram profile format
Generating some NGrams profiles
Generating a new language profile in Nutch is really easy. Simply launch the following command:
java org.apache.nutch.analysis.lang.NGramProfile -create <profile-name> <filename> <encoding>
profile-name is the ISO-639 2-letter codes of the new language.
filename is the name of the file used to build the new language profile (the biggest it is, and the most it contains different sources and subjects the better the profile will be).
encoding is the encoding of the file used to build the new profile (filename).
Labs tests are quite good (LanguageIdentifierBenchs), but in real life, they are not. In fact, in its actual version, the NewLanguageIdentifier expects that the provided text to analyze is UTF-8 encoded. However, it is not the case for a lot of fetched documents. So, the NewLanguageIdentifier needs to refer to a content-encoding meta-data. This data must be provided by a (todo) EncodingDetectorPlugin (see NUTCH-25 issue).