This is Perl module Lingua::JA::OkapiBM25.

INSTALLATION

Lingua::JA::OkapiBM25 installation is straightforward. If your CPAN shell is set up, you should just be able to do

% cpan Lingua::JA::OkapiBM25

Download it, unpack it, then build it as per the usual:

% perl Makefile.PL
% make && make test

Then install it:

% make install

DOCUMENTATION

Lingua::JA::OkapiBM25 documentation is available as in POD. So you can do:

% perldoc Lingua::JA::OkapiBM25

to read the documentation online with your favorite pager.

Takeshi Miki