Lingua::Treebank - Perl extension for manipulating the Penn Treebank format
use Lingua::Treebank; my @utterances = Lingua::Treebank->from_penn_file($filename); foreach (@utterances) { # $_ is a Lingua::Treebank::Const now foreach ($_->get_all_terminals) { # $_ is a Lingua::Treebank::Const that is a terminal (word) print $_->word(), ' ' $_->tag(), "\n"; } print "\n\n"; }
Modules for abstracting out the "natural" objects in the Penn Treebank format.
This class knows how to read two treebank formats, the Penn format and the Chomsky Normal Form (CNF) format. These formats differ in how they handle terminal nodes. The Penn format places pre-terminal part of speech tags in the left-hand position of a parenthesis-delimited pair, just like it does non-terminal nodes. The CNF format attaches pre-terminal tags to the word with an underscore. For example, the sentence "I spoke" would be rendered in each format as follows:
(S (NP (N I)) (VP (V spoke))) Penn (S (NP I_N) (VP spoke_V)) Chomsky Normal Form
Almost all the interesting tree-functionality is in the constituent-forming package (included in this distribution, see Lingua::Treebank::Const).
PLEASE NOTE: The format expected here is the .mrg format, not the .psd format. In other words, one POS-tag per word is required. (In response to CPAN bug 15079.)
.mrg
.psd
The value Lingua::Treebank::CONST_CLASS indicates what class should be used as the class for constituents. The default is Lingua::Treebank::Const; it will generate an error to use a value for $Lingua::Treebank::CONST_CLASS that is not a subclass of Lingua::Treebank::Const.
Lingua::Treebank::CONST_CLASS
Lingua::Treebank::Const
given a Penn treebank file, open it, extract the constituents, and return the roots.
given a Penn treebank filehandle, extract the constituents and return the roots.
given a Chomsky normal form file, open it, extract the constituents, and return the roots.
given a Chomsky normal form filehandle, extract the constituents and return the roots.
None by default.
Original version; created by h2xs 1.22 with options
-CAX Lingua::Treebank
Improved documentation.
added a VERBOSE variable that can be set.
A variety of additional features
more features still, also some bugfixes.
Removed references to Text::Balanced, which is slow and not uniformly available.
Corrected bug in Makefile.PL pointed out by Vassilii Khachaturov.
Added some documentation distinguishing that .mrg (and not .psd files) are supported.
text() method now suppresses anything with a -NONE- tag.
text()
-NONE-
$VERSION for Lingua::Treebank and Lingua::Treebank::Const now tied.
$VERSION
Actually include patch intended for 0.13. *sheesh*.
Include Lingua::Treebank::HeadFinder class in distro. Modify L::TB::Const to support head-child annotation.
also support 64-bit systems much better.
Including data for Lingua::Treebank::HeadFinder. Updating version numbers in Const.pm code Revised test code so that it doesn't require Devel::Cycle (but uses it if needed).
TO DO: Where is Penn Treebank documented?
Jeremy Gillmor Kahn, <kahn@cpan.org>
Copyright 2003-2008 by Jeremy Gillmor Kahn with additional support and ideas from Bill McNeill
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
1 POD Error
The following errors were encountered while parsing the POD:
You forgot a '=back' before '=head1'
To install Lingua::Treebank, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Lingua::Treebank
CPAN shell
perl -MCPAN -e shell install Lingua::Treebank
For more information on module installation, please visit the detailed CPAN module installation guide.