This is a Java version of the Morpha stemmer, a fast and robust morphological analyser for English based on finite-state techniques that returns the lemma and inflection type of a word, given the word form and its part of speech. (The latter is optional but accuracy is degraded if it is not present).

The original .lex and verb-stem files (see src/main/resources) were converted to Java using JFlex by Michael Schmitz [email protected]. This fork of his Morpha wrapper has been rewritten to retain affix information and throw fewer exceptions.

import org.samthomson.morpha.Morpha.Lemma;
import static org.samthomson.morpha.Morpha.stem;

// when part-of-speech tags are available:
Lemma sawVerb = stem("saw", "VBD");  // Lemma(see, ed)
sawVerb.lemma;  // "see"
sawVerb.affix;  // "ed"
Lemma sawNoun = stem("saw", "NN");  // Lemma(saw)
sawNoun.lemma;   // "saw"
sawNoun.affix;   // ""

// when part-of-speech tags are not available a best effort is made:
stem("saw");    // Lemma("see", "ed")
stem("finding") // Lemma("find", "ing")

To use this library as a dependency, add the following to your build.sbt:

libraryDependencies ++= Seq(
  "org.samthomson" % "morpha" % "1.1"
)

To use this library as a dependency, add the following to your pom.xml:

<repositories>
  <repository>
    <snapshots>
      <enabled>false</enabled>
    </snapshots>
    <id>central</id>
    <name>bintray</name>
    <url>http://jcenter.bintray.com</url>
  </repository>
</repositories>

<dependencies>
  <dependency>
    <groupId>org.samthomson</groupId>
    <artifactId>morpha</artifactId>
    <version>1.1</version>
  </dependency>
</dependencies>

(full version)

This directory contains software for morphological processing of English as developed by Kevin Humphreys [email protected], John Carroll [email protected] and Guido Minnen.

To be used for research purposes only (see section 4 below). If you make any changes, the authors would appreciate it if you sent them details of what you have done.

Covers the English inflectional suffixes:

• -s plural of nouns, 3rd person singular present of verbs
• -ed past tense
• -en past participle
• -ing progressive of verbs

4. Acknowledgements, copyrights etc.

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Copyright (c) 1995-2000 University of Sheffield, University of Sussex All rights reserved.

Redistribution and use of source and derived binary forms are permitted without fee provided that:

• they are not used in commercial products
• the above copyright notice and this paragraph are duplicated in all such forms
• any documentation, advertising materials, and other materials related to such distribution and use acknowledge that the software was developed by Kevin Humphreys [email protected], John Carroll [email protected] and Guido Minnen and refer to the following related publication:

Guido Minnen, John Carroll and Darren Pearce. 2001. `Applied morphological processing of English'. Natural Language Engineering, 7(3). 207-223.

The name of University of Sheffield may not be used to endorse or promote products derived from this software without specific prior written permission.

This software is provided "as is" and without any express or implied warranties, including, without limitation, the implied warranties of merchantibility and fitness for a particular purpose.

The exception lists were derived semi-automatically from WordNet 1.5, and various other corpora and MRDs.

Many thanks to Tim Baldwin, Chris Brew, Bill Fisher, Gerald Gazdar, Dale Gerdemann, Adam Kilgarriff and Ehud Reiter for suggested improvements.

WordNet 1.5 Copyright 1995 by Princeton University. All rights reseved.

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