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NAME

       jellyfish - jellyfish Documentation

OVERVIEW

       jellyfish is a library of functions for approximate and phonetic matching of strings.

       Source code is available on GitHub

       The library provides implementations of the following algorithms:

   Phonetic Encoding
       These  algorithms convert a string to a normalized phonetic encoding, converting a word to
       a representation of its pronunciation.  Each takes a single string  and  returns  a  coded
       representation.

   American Soundex
       soundex(s)
              Calculate the American Soundex of the string s.

       Soundex  is  an algorithm to convert a word (typically a name) to a four digit code in the
       form 'A123' where 'A' is the first letter of the name and  the  digits  represent  similar
       sounds.

       For   example  soundex('Ann')  ==  soundex('Anne')  ==  'A500'  and  soundex('Rupert')  ==
       soundex('Robert') == 'R163'.

       See the Soundex article at Wikipedia for more details.

   Metaphone
       metaphone(s)
              Calculate the metaphone code for the string s.

       The metaphone algorithm was designed as an improvement on Soundex.  It transforms  a  word
       into  a  string consisting of '0BFHJKLMNPRSTWXY' where '0' is pronounced 'th' and 'X' is a
       '[sc]h' sound.

       For example metaphone('Klumpz') == metaphone('Clumps') == 'KLMPS'.

       See the Metaphone article at Wikipedia for more details.

   NYSIIS
       nysiis(s)
              Calculate the NYSIIS code for the string s.

       The NYSIIS algorithm is an algorithm developed by the New York  State  Identification  and
       Intelligence  System.   It  transforms  a  word  into  a  phonetic code.  Like soundex and
       metaphone it is primarily intended for use on  names  (as  they  would  be  pronounced  in
       English).

       For example nysiis('John') == nysiis('Jan') == JAN.

       See the NYSIIS article at Wikipedia for more details.

   Match Rating Approach (codex)
       match_rating_codex(s)
              Calculate the match rating approach value (also called PNI) for the string s.

       The  Match  rating  approach  algorithm is an algorithm for determining whether or not two
       names are pronounced similarly.  The algorithm consists of an encoding  function  (similar
       to soundex or nysiis) which is implemented here as well as match_rating_comparison() which
       does the actual comparison.

       See the Match Rating Approach article at Wikipedia for more details.

   Stemming
   Porter Stemmer
       porter_stem(s)
              Reduce the string s to its stem using the common Porter stemmer.

       Stemming is the process of reducing a word to its root  form,  for  example  'stemmed'  to
       'stem'.

       Martin  Porter's  algorithm  is  a  common algorithm used for stemming that works for many
       purposes.

       See the official homepage for the Porter Stemming Algorithm for more details.

   String Comparison
       These methods are all measures of the difference (aka edit distance) between two strings.

   Levenshtein Distance
       levenshtein_distance(s1, s2)
              Compute the Levenshtein distance between s1 and s2.

       Levenshtein distance represents the number of  insertions,  deletions,  and  substitutions
       required to change one word to another.

       For example: levenshtein_distance('berne', 'born') == 2 representing the transformation of
       the first e to o and the deletion of the second e.

       See the Levenshtein distance article at Wikipedia for more details.

   Damerau-Levenshtein Distance
       damerau_levenshtein_distance(s1, s2)
              Compute the Damerau-Levenshtein distance between s1 and s2.

       A modification of Levenshtein distance, Damerau-Levenshtein distance counts transpositions
       (such as ifsh for fish) as a single edit.

       Where  levenshtein_distance('fish',  'ifsh')  ==  2  as it would require a deletion and an
       insertion, though damerau_levenshtein_distance('fish', 'ifsh') == 1 as this  counts  as  a
       transposition.

       See the Damerau-Levenshtein distance article at Wikipedia for more details.

   Hamming Distance
       hamming_distance(s1, s2)
              Compute the Hamming distance between s1 and s2.

       Hamming  distance  is  the  measure  of  the  number of characters that differ between two
       strings.

       Typically Hamming distance is undefined when strings are of  different  length,  but  this
       implementation     considers    extra    characters    as    differing.     For    example
       hamming_distance('abc', 'abcd') == 1.

       See the Hamming distance article at Wikipedia for more details.

   Jaro Similarity
       jaro_similarity(s1, s2)
              Compute the Jaro similarity between s1 and s2.

       Jaro distance is a string-edit distance that gives a  floating  point  response  in  [0,1]
       where 0 represents two completely dissimilar strings and 1 represents identical strings.

       WARNING:
          Prior  to  0.8.1  this function was named jaro_distance.  That name is still available,
          but is no longer recommended.  It will be replaced in 1.0 with a correct version.

   Jaro-Winkler Similarity
       jaro_winkler_similarity(s1, s2)
              Compute the Jaro-Winkler distance between s1 and s2.

       Jaro-Winkler is a modification/improvement to Jaro distance, like Jaro it gives a floating
       point  response  in  [0,1]  where  0  represents  two  completely dissimilar strings and 1
       represents identical strings.

       WARNING:
          Prior to 0.8.1 this function was named jaro_winkler.  That name is still available, but
          is no longer recommended.  It will be replaced in 1.0 with a correct version.

       See the Jaro-Winkler distance article at Wikipedia for more details.

   Match Rating Approach (comparison)
       match_rating_comparison(s1, s2)
              Compare  s1  and  s2  using  the  match  rating approach algorithm, returns True if
              strings are considered equivalent or False if not.  Can also return None if s1  and
              s2 are not comparable (length differs by more than 3).

       The  Match  rating  approach  algorithm is an algorithm for determining whether or not two
       names are pronounced similarly.  Strings are first encoded using match_rating_codex() then
       compared according to the MRA algorithm.

       See the Match Rating Approach article at Wikipedia for more details.

   Changelog
   0.8.9 - 26 October 2021
       • fix buffer overflow in NYSIIS

       • remove unnecessary/undocumented special casing of digits in Jaro-Winkler

   0.8.8 - 17 August 2021
       • release fix to fix Linux wheel issue

   0.8.7 - 16 August 2021
       • safer allocations from CJellyfish

       • include aarch64 wheels

   0.8.4 - 4 August 2021
       • fix for jaro winkler (cjellyfish#8)

   0.8.3 - 11 March 2021
       • build changes

       • include OSX and Windows wheels

   0.8.2 - 21 May 2020
       • fix jaro_winkler/jaro_winkler_similarity mix-up

       • deprecate  jaro_distance  in  favor of jaro_similarity backwards compatible shim left in
         place, will be removed in 1.0

       • (note: 0.8.1 was a broken release without proper C libraries)

   0.8.0 - 21 May 2020
       • rename jaro_winkler  to  jaro_winkler_similarity  to  match  other  functions  backwards
         compatible shim added, but will be removed in 1.0

       • fix soundex bug with W/H cases, #83

       • fix metaphone bug with WH prefix, #108

       • fix C match rating codex bug with duplicate letters, #121

       • fix metaphone bug with leading vowels and 'kn' pair, #123

       • fix Python jaro_winkler bug #124

       • fix Python 3.9 deprecation warning

       • add manylinux wheels

   0.7.2 - 5 June 2019
       • fix CJellyfish damerau_levenshtein w/ unicode, thanks to immerrr

       • fix final H in NYSIIS

       • fix issue w/ trailing W in metaphone

   0.7.1 - 10 January 2019
       • restrict install to Python >= 3.4

   0.7.0 - 10 January 2019
       • drop Python 2 compatibility & legacy code

       • add bugfix for NYSIIS for words starting with PF

   0.6.1 - April 16 2018
       • fixed wheel release issue

   0.6.0 - April 7 2018
       • fix quite a few bugs & differences between C/Py implementations

       • add wagner-fischer testdata

       • uppercase soundex result

       • better error handling in nysiis, soundex, and jaro

   0.5.6 - June 23 2016
       • bugfix for metaphone & soundex raising unexpected TypeErrors on Windows (#54)

   0.5.5 - June 21 2016
       • bugfix for metaphone WH case

   0.5.4 - May 13 2016
       • bugfix for C version of damerau_levenshtein thanks to Tyler Sellon

   0.5.3 - March 15 2016
       • style/packaging changes

   0.5.2 - February 3 2016
       • testing fixes for Python 3.5

       • bugfix for Metaphone w/ silent H thanks to Jeremy Carbaugh

   0.5.1 - July 12 2015
       • bugfixes for NYSIIS

       • bugfixes for metaphone

       • bugfix for C version of jaro_winkler

   0.5.0 - April 23 2015
       • consistent unicode behavior, all functions take unicode and reject bytes on Py2 and 3, C
         and Python

       • parametrize tests

       • Windows compiler support

   0.4.0 - March 27 2015
       • tons of new tests

       • documentation

       • split out cjellyfish

       • test all w/ unicode and plenty of fixes to accommodate

       • 100% test coverage

   0.3.4 - February 4 2015
       • fix segfaults and memory leaks via Danrich Parrol

   0.3.3 - November 20 2014
       • fix bugs in damerau and NYSIIS

   0.3.2 - August 11 2014
       • fix for jaro-winkler from David McKean

       • more packaging fixes

   0.3.1 - July 16 2014
       • packaging fix for C/Python alternative

   0.3.0 - July 15 2014
       • python alternatives where C isn't available

   0.2.2 - March 14 2014
       • testing fixes

       • assorted bugfixes in NYSIIS

   0.2.0 - January 26 2012
       • incorporate some speed changes from Peter Scott

       • segfault bugfixes.

   0.1.2 - September 16 2010
       • initial working release

IMPLEMENTATION

       Each algorithm has C and Python implementations.

       On a typical CPython install the C implementation will be used. The  Python  versions  are
       available for PyPy and systems where compiling the CPython extension is not possible.

       To explicitly use a specific implementation, refer to the appropriate module:

          import jellyfish._jellyfish as pyjellyfish
          import jellyfish.cjellyfish as cjellyfish

       If  you've  already imported jellyfish and are not sure what implementation you are using,
       you can check by querying jellyfish.library:

          if jellyfish.library == 'Python':
              # Python implementation
          elif jellyfish.library == 'C':
              # C implementation

       • IndexModule IndexSearch Page

AUTHOR

       James Turk

COPYRIGHT

       2023, James Turk