Solve nested entities problems by using SpanCategorizer #88
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Using
doc.spans["sc"](SpanCategorizer) to solve the problem of overlapped tokens in nested NER for spacy. By replacingdoc.entswithdoc.spans["sc"], all possible entities are able to be stored without any errors.After storing all possible spans, we filter out overlapping spans before adding them to
doc.ents. Here we remove overlapping spans usingspacy.util.filter_spans. When spans overlap, the rule is to prefer the first longest span over shorter ones.