Problem with using spacy.matcher.matcher.Matcher.add() method

Question

I am getting an error when trying to use spacy matcher:

~\Anaconda3\lib\site-packages\spacy\matcher\matcher.pyx in spacy.matcher.matcher.Matcher.add()
TypeError: add() takes exactly 2 positional arguments (3 given)

Is there any alternate function for spacy.matcher.matcher.Matcher.add()?

Answer 1

See the SpaCy Matcher.add() documentation:

Changed in v3.0
As of spaCy v3.0, Matcher.add takes a list of patterns as the second argument (instead of a variable number of arguments). The on_match callback becomes an optional keyword argument.

patterns = [[{"TEXT": "Google"}, {"TEXT": "Now"}], [{"TEXT": "GoogleNow"}]] - matcher.add("GoogleNow", on_match, *patterns) + matcher.add("GoogleNow", patterns, on_match=on_match)

Example usage:

from spacy.matcher import Matcher

matcher = Matcher(nlp.vocab)
pattern = [{"LOWER": "hello"}, {"LOWER": "world"}]
matcher.add("HelloWorld", [pattern])
doc = nlp("hello world!")
matches = matcher(doc)

Answer 2

Instead of using matcher.add('Relation_name', None, pattern)

You can use: matcher.add('Relation_name', [pattern], on_match=None)

Answer 3

In addition, if you have multiple patterns to be extracted, an example would be as below.

import spacy
nlp = spacy.load('en_core_web_sm')

from spacy.matcher import Matcher
matcher = Matcher(nlp.vocab)

pattern1 = [{'LOWER':'solarpower'}]
pattern2 = [{'LOWER':'solar'},{'IS_PUNCT':True},{'LOWER':'power'}]
pattern3 = [{'LOWER':'solar'},{'LOWER':'power'}]

matcher.add('SolarPower', [pattern1,pattern2,pattern3])
doc = nlp(u"The Solar Power industry continues to grow a solarpower increases. Solar-power is good")
found_matches = matcher(doc)


for _,start,end in found_matches:
    span = doc[start:end]
    print(span)

Output would be:

Solar Power 
solarpower 
Solar-power

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