This is Perl module Lingua::JA::TFIDF.
INSTALLATION
Lingua::JA::TFIDF installation is straightforward. If your CPAN shell is set up,
you should just be able to do
% cpan Lingua::JA::TFIDF
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::TFIDF documentation is available as in POD. So you can do:
% perldoc Lingua::JA::TFIDF
to read the documentation online with your favorite pager.
Takeshi Miki