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Stanford NER - Jan 2009 ---------------------------------------------- This package provides a high-performance machine learning based named entity recognition system, including facilities to train models from supervised training data and pre-trained models for English. (c) 2002-2009. The Board of Trustees of The Leland Stanford Junior University. All Rights Reserved. Original CRF code by Jenny Finkel. Additional modules, features, internationalization, compaction, and support code by Christopher Manning, Christopher Cox, Huy Nguyen and Shipra Dingare, and Anna Rafferty. This release prepared by Christopher Manning. LICENSE The software is licensed under the full GPL. Please see the file LICENCE.txt For more information, bug reports, and fixes, contact: Christopher Manning Dept of Computer Science, Gates 1A Stanford CA 94305-9010 USA firstname.lastname@example.org http://www-nlp.stanford.edu/software/CRF-NER.shtml CONTACT For questions about this distribution, please contact Stanford's JavaNLP group at email@example.com. We provide assistance on a best-effort basis. TUTORIAL Quickstart guidelines, primarily for end users who wish to use the included NER models, are below. For further instructions on training your own NER model, go to http://www-nlp.stanford.edu/software/crf-faq.shtml. INCLUDED SERIALIZED MODELS / TRAINING DATA The basic included serialized model is a 3 class NER tagger that can label: PERSON, ORGANIZATION, and LOCATION entities. It is included as ner-eng-ie.crf-3-all2008.ser.gz and within the jar file. It is trained on data from CoNLL, MUC6, MUC7, and ACE. Because this model is trained on both US and UK newswire, it is fairly robust across the two domains. We have also included a 4 class NER tagger trained on the CoNLL 2003 Shared Task training data that labels for PERSON, ORGANIZATION, LOCATION, and MISC. It is named ner-eng-ie.crf-4-conll.ser.gz . All of the serialized classifiers come in two versions, the second of which uses a distributional similarity lexicon to improve performance (by about 1.5% F-measure). These classifiers have additional features which make them perform substantially better, but they require rather more memory. QUICKSTART INSTRUCTIONS This NER system requires Java 1.5 or later. We have only tested it on the SUN JVM. Providing java is on your PATH, you should just be able to run an NER GUI demonstration by just clicking. It might work to double-click on the stanford-ner.jar archive but this may well fail as the operating system does not give Java enough memory for our NER system, so it is safer to instead double click on the ner-gui.bat icon (Windows) or ner-gui.sh (Linux/Unix/MacOSX). Then, from the Classifier menu, either load a CRF classifier from the classifiers directory of the distribution or you should be able to use the Load Default CRF option. You can then either load a text file or web page from the File menu, or decide to use the default text in the window. Finally, you can now named entity tag the text by pressing the Run NER button. From a command line, you need to have java on your PATH and the stanford-ner.jar file in your CLASSPATH. (The way of doing this depends on your OS/shell.) The supplied ner.bat and ner.sh should work to allow you to tag a single file. For example, for Windows: ner file Or on Unix/Linux you should be able to parse the test file in the distribution directory with the command: java -mx600m edu.stanford.nlp.ie.crf.CRFClassifier -loadClassifier classifiers/ner-eng.8class.better.crf.gz -textFile sample.txt When run from a jar file, you also have the option of using a serialized classifier contained in the jar file. A default serialized classifier (ner-eng-ie.crf-3-all2008.ser.gz) is in the jar file and can be used by just saying: java -mx300m -cp stanford-ner.jar edu.stanford.nlp.ie.crf.CRFClassifier -textFile sample.txt If you use the -jar command, or double-click the jar file, NERGUI is automatically started, and you will also be given the option (under the 'Classifier' menu item) to load a default supplied classifier: java -mx300m -jar stanford-ner.jar PROGRAMMATIC USE The NERDemo file illustrates a couple of ways of calling the system programatically. You should get the same results from java -mx300m NERDemo classifiers/ner-eng-ie.crf-3-all2008.ser.gz sample.txt as from using CRFClassifier. For more information on API calls, look in the enclosed javadoc directory: load index.html in a browser and look first at the edu.stanford.nlp.ie.crf package and CRFClassifier class. If you wish to train your own NER systems, look also at the edu.stanford.nlp.ie package NERFeatureFactory class. SERVER VERSION The NER code may also be run as a server listening on a socket: java -mx400m -cp stanford-ner.jar edu.stanford.nlp.ie.NERServer 1234 You can specify which model to load with flags, either one on disk: java -mx400m -cp stanford-ner.jar edu.stanford.nlp.ie.NERServer -loadClassifier classifiers/ner-eng-ie.crf-3-all2008.ser.gz 1234 Or if you have put a model inside the jar file: java -mx400m -cp stanford-ner.jar edu.stanford.nlp.ie.NERServer -loadJarClassifier ner-eng-ie.crf-3-all2008.ser.gz 1234 RUNNING CLASSIFIERS FROM INSIDE A JAR FILE The software can run any serialized classifier from within a jar file by giving the flag -loadJarClassifier resourceName . An end user can make their own jar files with the desired NER models contained inside. The serialized classifier must be located immediately under classifiers/ in the jar file, with the name given. This allows single jar file deployment. PERFORMANCE GUIDELINES Performance depends on many factors. Speed and memory use depend on hardware, operating system, and JVM. Accuracy depends on the data tested on. Nevertheless, in the belief that something is better than nothing, here are some statistics from one machine on one test set, in semi-realistic conditions (where the test data is somewhat varied). ner-eng-ie.crf-3-all2006.ser.gz (older version of ner-eng-ie.crf-3-all2008.ser.gz) Memory: 100 MB (on a 32 bit machine) PERSON ORGANIZATION LOCATION 89.19 80.15 85.48 ner-eng-ie.crf-3-all2006-distsim.ser.gz (older version of ner-eng-ie.crf-3-all2008-distsim.ser.gz) Memory: 320MB (on a 32 bit machine) PERSON ORGANIZATION LOCATION 91.88 82.91 88.21