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Copyright (c) 2002-2012 The Board of Trustees of The Leland Stanford Junior University. All Rights Reserved.

Original core parser code by Dan Klein. Support code, additional modules, languages, features, internationalization, compaction, typed dependencies, etc. by Christopher Manning, Roger Levy, Teg Grenager, Galen Andrew, Marie-Catherine de Marneffe, Jenny Finkel, Spence Green, Bill MacCartney, Anna Rafferty, Huihsin Tseng, Pi-Chuan Chang, Wolfgang Maier, and Richard Eckart.

This release prepared by John Bauer.

This package contains 3 parsers: a high-accuracy unlexicalized PCFG, a lexicalized dependency parser, and a factored model, where the estimates of dependencies and an unlexicalized PCFG are jointly optimized to give a lexicalized PCFG treebank parser. Also included are grammars for various languages for use with these parsers.

For more information about the parser API, point a web browser at the included javadoc directory (use the browser's Open File command to open the index.html file inside the javadoc folder). Start by looking at the Package page for the edu.stanford.nlp.parser.lexparser package, and then look at the page for the LexicalizedParser class documentation therein, particularly documentation of the main method.

Secondly, you should also look at the Parser FAQ on the web:

http://nlp.stanford.edu/software/parser-faq.shtml

This software requires Java 5 (JDK 1.5.0+). (You must have installed it separately. Check that the command "java -version" works and gives 1.5+.)

On a Unix system you should be able to parse the English test file with the following command:

./lexparser.sh data/testsent.txt

This uses the PCFG parser, which is quick to load and run, and quite accurate.

[Notes: it takes a few seconds to load the parser data before parsing begins; continued parsing is quicker. To use the lexicalized parser, replace englishPCFG.ser.gz with englishFactored.ser.gz in the lexparser.sh script and use the flag -mx600m to give more memory to java.]

On a Windows system, assuming that java is on your PATH, you should be able to run a parsing GUI by double-clicking on the lexparser-gui.bat icon, or giving the command lexparser-gui in this directory from a command prompt.

Click Load File, Browse, and navigate to and select testsent.txt in the top directory of the parser distribution. Click Load Parser, Browse, and select the models jar, also in the top directory of the parser distribution. From the models jar, select englishPCFG.ser.gz. Click Parse to parse the first sentence.

The GUI is also available under Unix:

lexparser-gui.sh

Under Mac OS X, you can double-click on lexparser-gui.command to invoke the GUI. The command-line version works on all platforms. Use lexparser.bat to run it under Windows. The GUI is only for exploring the parser. It does not allow you to save output. You need to use the command-line program or programmatic API to do serious work with the parser.

The parser is supplied with several trained grammars. There are English grammars based on the standard LDC Penn Treebank WSJ training sections 2-21 (wsj*), and ones based on an augmented data set, better for questions, commands, and recent English and biomedical text (english*).

All grammars are located in the included models jar. (If you'd like to have grammar files like in older versions of the parser, you can get them by extracting them from the jar file with the 'jar -xf' command.)

MULTILINGUAL PARSING In addition to the English grammars, the parser comes with trained grammars for Arabic, Chinese, French, and German. To parse with these grammars, run

lexparser-lang.sh

with no arguments to see usage instructions. You can change language-specific settings passed to the parser by modifying lexparser_lang.def.

You can also train and evaluate new grammars using:

lexparser-lang-train-test.sh

To see how we trained the grammars supplied in this distribution, see

bin/makeSerialized.csh

You will not be able to run this script (since it uses Stanford-specific file paths), but you should be able to see what we did.

Arabic Trained on parts 1-3 of the Penn Arabic Treebank (ATB) using the pre-processing described in (Green and Manning, 2010). The default input encoding is UTF-8 Arabic script. To parse with Buckwalter encoding, we recommend conversion to UTF-8 using the package

edu.stanford.nlp.international.arabic.Buckwalter

which is included in stanford-parser.jar.

Note that the parser requires clitic segmentation per the ATB standard prior to parsing. A freely available package for performing this segmentation is MADA+TOKAN:

http://www1.cs.columbia.edu/~rambow/software-downloads/MADA_Distribution.html

Chinese There are Chinese grammars trained just on mainland material from Xinhua and more mixed material from the LDC Chinese Treebank. The default input encoding is GB18030.

French Trained on the functionally annotated section of the French Treebank (FTB) using the pre-processing described in (Green et al., 2011). Tokenization according to the FTB standard is required prior to parsing. A freely available set of tokenization tools can be found at:

http://gforge.inria.fr/projects/lingwb/

German Trained on the Negra corpus. Details are included in (Rafferty and Manning, 2008).

The pre-processed versions of the ATB described in (Green and Manning, 2010) and the FTB described in (Green et al., 2011) can be reproduced using the TreebankPreprocessor included in this release. The configuration files are located in /conf. For example, to create the ATB data, run:

bin/run-tb-preproc -v conf/atb-latest.conf

Note that you'll need to update the conf file paths to your local treebank distributions as the data is not distributed with the parser. You'll also need to set the classpath in the cmd_line variable of run-tb-preproc.

The TreebankPreprocessor conf files support various options, which are documented in

edu.stanford.nlp.international.process.ConfigParser

The Stanford parser comes with Java implementations of the following evaluation metrics:

Dependency Labeled Attachment

Evalb         (Collins, 1997)
  -Includes per-category evaluation with the -c option

Leaf Ancestor (Sampson and Babarczy, 2003)
  -Both micro- and macro-averaged score

Tagging Accuracy

See the usage instructions and javadocs in the requisite classes located in edu.stanford.nlp.parser.metrics.

LICENSE

StanfordLexicalizedParser -- a probabilistic lexicalized NL CFG parser Copyright (c) 2002-2012 The Board of Trustees of The Leland Stanford Junior University. All Rights Reserved.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

For more information, bug reports, fixes, contact: Christopher Manning Dept of Computer Science, Gates 1A Stanford CA 94305-9010 USA [email protected] http://nlp.stanford.edu/downloads/lex-parser.shtml

• 2012-11-12 2.0.4 Dependency speed improvements; other dependency changes
• 2012-07-09 2.0.3 Minor bug fixes
• 2012-05-22 2.0.2 Supports adding extra data in non-tree format
• 2012-03-09 2.0.1 Caseless English model added, ready for maven
• 2012-01-11 2.0.0 Threadsafe!
• 2011-09-14 1.6.9 Added some imperatives to the English training data; added root dependency.
• 2011-06-15 1.6.8 Added French parser and leaf ancestor evaluation metric; reorganized distribution; new data preparation scripts; rebuilt grammar models; other bug fixes
• 2011-05-15 1.6.7 Minor bug fixes
• 2011-04-17 1.6.6 Compatible with tagger, corenlp and tregex.
• 2010-10-30 1.6.5 Further improvements to English Stanford Dependencies and other minor changes
• 2010-08-16 1.6.4 More minor bug fixes and improvements to English Stanford Dependencies and question parsing
• 2010-07-09 1.6.3 Improvements to English Stanford Dependencies and question parsing, minor bug fixes
• 2010-02-25 1.6.2 Improvements to Arabic parser models, and to English and Chinese Stanford Dependencies
• 2008-10-19 1.6.1 Slightly improved Arabic, German and Stanford Dependencies
• 2007-08-18 1.6 Added Arabic, k-best PCCFG parsing; improved English grammatical relations
• 2006-05-30 1.5.1 Improved English and Chinese grammatical relations; fixed UTF-8 handling
• 2005-07-20 1.5 Added grammatical relations output; fixed bugs introduced in 1.4
• 2004-03-24 1.4 Made PCFG faster again (by FSA minimization); added German support
• 2003-09-06 1.3 Made parser over twice as fast; added tokenization options
• 2003-07-20 1.2 Halved PCFG memory usage; added support for Chinese
• 2003-03-25 1.1 Improved parsing speed; included GUI, improved PCFG grammar
• 2002-12-05 1.0 Initial release