Ruby gem implementing the imatch duplicate detection algorithm from http://bit.ly/a87MdP
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README.md

imatch

DESCRIPTION:

An implementation of the IMatch algorithm as described at http://www.ir.iit.edu/~abdur/Research/Duplicate.html

FEATURES:

  • Stemming via the 'stemmer' gem and :stemming option
  • Stop words via the :stop_words option
  • Built-in English lexicon

KNOWN PROBLEMS:

  • None, yet.

REQUIREMENTS:

  • Digest::SHA1
  • Stemmer gem (Porter Stemmer implementation)

INSTALL:

gem install imatch

DEVELOPERS:

# Default settings (English lexicon, no stemming, no stop words)
imatch = IMatch.new
imatch.signature('your string here') # => Returns a string with the hex SHA1 signature

# Add stop words
imatch = IMatch.new(IMatch::DEFAULT_LEXICON_FILE, :stop_words => ['a'])
imatch.signature("foo")
# same result.
imatch.signature("a foo")


# Turn on stemming
imatch = IMatch.new(IMatch::DEFAULT_LEXICON_FILE, :stemming => true)
imatch.signature("follower")
# same result.
imatch.signature("followers")

LICENSE:

Copyright 2010 Twitter, Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.