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109 lines
5.0 KiB
Python
109 lines
5.0 KiB
Python
# coding: utf-8
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from __future__ import unicode_literals
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import requests
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from spacy.lang.en import English
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from spacy.matcher import PhraseMatcher
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from spacy.tokens import Doc, Span, Token
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class RESTCountriesComponent(object):
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"""Example of a spaCy v2.0 pipeline component that requests all countries
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via the REST Countries API, merges country names into one token, assigns
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entity labels and sets attributes on country tokens, e.g. the capital and
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lat/lng coordinates. Can be extended with more details from the API.
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REST Countries API: https://restcountries.eu
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API License: Mozilla Public License MPL 2.0
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"""
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name = 'rest_countries' # component name, will show up in the pipeline
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def __init__(self, nlp, label='GPE'):
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"""Initialise the pipeline component. The shared nlp instance is used
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to initialise the matcher with the shared vocab, get the label ID and
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generate Doc objects as phrase match patterns.
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"""
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# Make request once on initialisation and store the data
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r = requests.get('https://restcountries.eu/rest/v2/all')
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r.raise_for_status() # make sure requests raises an error if it fails
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countries = r.json()
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# Convert API response to dict keyed by country name for easy lookup
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# This could also be extended using the alternative and foreign language
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# names provided by the API
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self.countries = {c['name']: c for c in countries}
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self.label = nlp.vocab.strings[label] # get entity label ID
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# Set up the PhraseMatcher with Doc patterns for each country name
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patterns = [nlp(c) for c in self.countries.keys()]
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self.matcher = PhraseMatcher(nlp.vocab)
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self.matcher.add('COUNTRIES', None, *patterns)
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# Register attribute on the Token. We'll be overwriting this based on
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# the matches, so we're only setting a default value, not a getter.
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# If no default value is set, it defaults to None.
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Token.set_extension('is_country', default=False)
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Token.set_extension('country_capital')
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Token.set_extension('country_latlng')
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Token.set_extension('country_flag')
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# Register attributes on Doc and Span via a getter that checks if one of
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# the contained tokens is set to is_country == True.
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Doc.set_extension('has_country', getter=self.has_country)
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Span.set_extension('has_country', getter=self.has_country)
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def __call__(self, doc):
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"""Apply the pipeline component on a Doc object and modify it if matches
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are found. Return the Doc, so it can be processed by the next component
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in the pipeline, if available.
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"""
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matches = self.matcher(doc)
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spans = [] # keep the spans for later so we can merge them afterwards
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for _, start, end in matches:
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# Generate Span representing the entity & set label
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entity = Span(doc, start, end, label=self.label)
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spans.append(entity)
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# Set custom attribute on each token of the entity
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# Can be extended with other data returned by the API, like
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# currencies, country code, flag, calling code etc.
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for token in entity:
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token._.set('is_country', True)
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token._.set('country_capital', self.countries[entity.text]['capital'])
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token._.set('country_latlng', self.countries[entity.text]['latlng'])
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token._.set('country_flag', self.countries[entity.text]['flag'])
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# Overwrite doc.ents and add entity – be careful not to replace!
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doc.ents = list(doc.ents) + [entity]
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for span in spans:
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# Iterate over all spans and merge them into one token. This is done
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# after setting the entities – otherwise, it would cause mismatched
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# indices!
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span.merge()
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return doc # don't forget to return the Doc!
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def has_country(self, tokens):
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"""Getter for Doc and Span attributes. Returns True if one of the tokens
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is a country. Since the getter is only called when we access the
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attribute, we can refer to the Token's 'is_country' attribute here,
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which is already set in the processing step."""
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return any([t._.get('is_country') for t in tokens])
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# For simplicity, we start off with only the blank English Language class and
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# no model or pre-defined pipeline loaded.
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nlp = English()
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rest_countries = RESTCountriesComponent(nlp) # initialise component
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nlp.add_pipe(rest_countries) # add it to the pipeline
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doc = nlp(u"Some text about Colombia and the Czech Republic")
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print('Pipeline', nlp.pipe_names) # pipeline contains component name
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print('Doc has countries', doc._.has_country) # Doc contains countries
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for token in doc:
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if token._.is_country:
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print(token.text, token._.country_capital, token._.country_latlng,
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token._.country_flag) # country data
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print('Entities', [(e.text, e.label_) for e in doc.ents]) # all countries are entities
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