spaCy/spacy/tests/regression/test_issue5918.py

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from spacy.lang.en import English
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from spacy.pipeline import merge_entities
def test_issue5918():
# Test edge case when merging entities.
nlp = English()
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ruler = nlp.add_pipe("entity_ruler")
patterns = [
{"label": "ORG", "pattern": "Digicon Inc"},
{"label": "ORG", "pattern": "Rotan Mosle Inc's"},
{"label": "ORG", "pattern": "Rotan Mosle Technology Partners Ltd"},
]
ruler.add_patterns(patterns)
text = """
Digicon Inc said it has completed the previously-announced disposition
of its computer systems division to an investment group led by
Rotan Mosle Inc's Rotan Mosle Technology Partners Ltd affiliate.
"""
doc = nlp(text)
assert len(doc.ents) == 3
# make it so that the third span's head is within the entity (ent_iob=I)
# bug #5918 would wrongly transfer that I to the full entity, resulting in 2 instead of 3 final ents.
doc[29].head = doc[33]
doc = merge_entities(doc)
assert len(doc.ents) == 3