Ben Bullock
and 1 contributors

NAME

Lingua::Guess - A statistical language guesser

SYNOPSIS

    use utf8;
    use Lingua::Guess;
    my $guesser = Lingua::Guess->new ();
    my @lines = split (/\n/, <<EOF);
    This is a test of the language checker
    Verifions que le détecteur de langues marche
    Sprawdźmy, czy odgadywacz języków pracuje
    EOF
    for my $line (@lines) {
        my $guess = $guesser->simple_guess ($line);
        print "'$line' was $guess\n";
    }

produces output

    'This is a test of the language checker' was english
    'Verifions que le détecteur de langues marche' was french
    'Sprawdźmy, czy odgadywacz języków pracuje' was polish

(This example is included as synopsis.pl in the distribution.)

DESCRIPTION

This module attempts to guess what human language a piece of text is written in. This is a fork of a module called Language::Guess, which was deleted from CPAN by its author.

METHODS

new

    my $lg = Lingua::Guess->new ();

Make a new object. This takes a hash as argument with the following keys:

modeldir

The location of the training data. If this is not supplied, the training data supplied with the module is used.

guess

This method returns arrayref of hashes in the form

    [{name => NAME, score => SCORE}]

where score represents the likelihood of the language given by name as a fractional probability.

simple_guess

    my $name = simple_guess ($text);

This method returns a one-word string containing the English name of the guessed language.

DEPENDENCIES

Carp

"croak" in Carp is used to report errors.

File::Spec::Functions

"catfile" in File::Spec::Functions is used in reading the training data files.

Unicode::Normalize

"NFC" in Unicode::Normalize is used to normalize inputs.

Unicode::UCD

"charinfo" in Unicode::UCD is used to get information about characters

SEE ALSO

Text::Guess::Language
Text::Language::Guess
Language::Guess at backpan.perl.org

BUGS

The module has a number of oddities, which I'll slowly be trying to resolve.

  • The module will instantly decide that something is Korean or Japanese if it has just one Korean or Japanese letter in it. That means that, for example, if you give it a Wikipedia page to guess the language, it will seize upon the text in the interlanguage link and instantly proclaim it to be in Korean or Japanese, regardless of how much other text there may be.

  • The guessed language is returned as a lower-case English name of the language rather than an ISO language code.

STANDALONE SCRIPT

A standalone script called linguaguess is installed with the module. It requires Unicode::UTF8 and File::Slurper to be installed locally. These modules are not dependencies of Lingua::Guess.

HISTORY

This module used to be called Language::Guess. It was released in 2004. It was deleted from CPAN at an unknown date, but not before two Python forks, https://pypi.python.org/pypi/guess-language, and https://bitbucket.org/spirit/guess_language and one C++ fork https://websvn.kde.org/branches/work/sonnet-refactoring/common/nlp/guesslanguage.cpp, had been created. It was restored to CPAN under the title Lingua::Guess by Ben Bullock on 17th April 2017. Changes to the original module include

Removal of Unicode upgrading

For some reason, the module itself, which contains no non-ASCII, had "use utf8;" at the top of it, and the test file, which contained various languages, had no "use utf8;". The module was also upgrading all input bytes with "_utf8_on" in Encode rather than using "decode_utf8" in Encode. This behaviour was completely excised from the module.

Training data moved into module's space

The training data was moved into the module's space using the method described in Acme::Include::Data. "modeldir" was given a default value of this directory.

Documentation expanded

Most of the methods weren't documented at all in the original module.

Bugs fixed

Two eleven year old bugs in the bug queue for Language::Guess were fixed.

train method removed

An undocumented, unused, and untested method called "train" was removed from the module.

I have made no attempt to contact the author of the software Maciej Ceglowski, nor have I applied for namespace permission before creating this fork, but simply renamed it.

COPYRIGHT

(c) 2004 National Institute for Technology and Liberal Education

LICENSE

This software is released under version 2 of the GNU General Public License.

MAINTAINER

This module is maintained by Ben Bullock <bkb@cpan.org>.

AUTHOR

Maciej Ceglowski