NLP | Leacock Chordorow (LCH) and Path similarity for Synset

Last Updated : 29 Jan, 2019

Path-based Similarity: It is a similarity measure that finds the distance that is the length of the shortest path between two synsets.

Leacock Chordorow (LCH) : It is a similarity measure which is an extended version of Path-based similarity as it incorporates the depth of the taxonomy. Therefore, it is the negative log of the shortest path (spath) between two concepts (synset_1 and synset_2) divided by twice the total depth of the taxonomy (D) as defined in fig below.

Code #1 : Introducing Synsets.

from nltk.corpus import wordnet  
  
syn1 = wordnet.synsets('hello')[0]  
syn2 = wordnet.synsets('selling')[0]  
  
print ("hello name : ", syn1.name())  
print ("selling name : ", syn2.name())  

Output :

hello name :   hello.n.01
selling name :   selling.n.01

Code #2 : Path Similarity

syn1.path_similarity(syn2)

Output :

0.08333333333333333

Code #3 : Leacock Chordorow (LCH) Similarity

syn1.lch_similarity(syn2)

Output :

1.1526795099383855

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