Is wordnet path similarity commutative?

Question

I am using the wordnet API from nltk. When I compare one synset with another I got None but when I compare them the other way around I get a float value.

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Answer 1

I don't think it is a bug in wordnet per se. In your case, automobile is specified as a verb and car as noun, so you will need to look through the synset to see what the graph looks like and decide if the nets are labeled correctly.

A = 'car.n.01'
B = 'automobile.v.01'
C = 'automobile.n.01'


wn.synset(A).path_similarity(wn.synset(B)) 
wn.synset(B).path_similarity(wn.synset(A)) 


wn.synset(A).path_similarity(wn.synset(C)) # is 1
wn.synset(C).path_similarity(wn.synset(A)) # is also 1