I am trying to use the core-nlp annotation pipeline with default settings all through from tokenizing until ner_tags. I did observe that the "tokenizer" module is identifying , say "Vice President" as two individual tokens {vice,President} resulting in ner_tags identification as {o,TITLE} instead of {Vice President} and {TITLE}. How can I get the tokenizer to identify "Vice president" as one single token , that help Ner_Tags to identify titles appropriately.
How to identify n-gram before tokenization in stanford core-nlp?
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What properties are you using to get TITLE as an NER tag? This is not one of the standard tags, and if you're using the TokensRegexNER annotator (e.g., for the
kbpannotator) multi-word titles like 'vice president' should be picked up. It works on corenlp.run at least.In general, it's not the tokenizer's job to collapse NER spans into a single mention. The tokenizer should separate 'vice' and 'president' into different tokens, both of which should be marked TITLE by an appropriate NER annotator. You may be interested in the
entitymentionannotator, which groups contiguous NER tags into NER mentions -- this would give you 'vice president' as a single mention, rather than two tokens both marked as TITLE. These mentions can be retrieved using the mentions annotation on a sentence CoreMap, or using theList<String> mention(String nerTag)orList<String> mentions()functions in the simple API.