CODEWITHSUNDEEP
machine-learningnlp
santosh
santosh

Reputation: 81

What is the difference between Named Entity Recognition and Named Entity Extraction?

Please help me understand the difference between Named Entity Recognition and Named Entity Extraction.

Upvotes: 0

Views: 2535

Answers (2)

5agado
5agado

Reputation: 2454

There is no such a thing as Named Entity Extraction.
Paraphrasing better the sentence I would say that Named Entity Extraction is simple the process of concrete extracting previously recognized named entities. So, in a sense, there is no real theoretical knowledge that is relevant to this task, is just a matter of defining the mechanical operation.

If we are instead interested in extracting all the specific entities or the additional information regarding them from a piece text, than we have to look at information or knowledge extraction.

For information extraction you could for example ask to extract all the names of cities, or e-mail addresses, that appear in a corpus of documents. For such a task Named Entity Extraction could be used. You could even go much more generic, asking simply to extract general knowledge, for example in the form of relations (relation extraction).

For more details I would suggest the Natural Language Processing chapter of the book Artificial Intelligence: A Modern Approach.

Upvotes: 0

Mike
Mike

Reputation: 21

Named Entity Recognition is recognition of the surface form of an Entity (person, place, organization), i.e. "George Bush" or "Barack Obama" are "PERSON" entities in this text string.

Entity Extraction will extract additional information as attributes from the text string. For example in the sentence "George W. Bush was president before President Obama" recognizing "Obama" as a person with attribute "title=president".

But if you look at software the distinction is often blurred.

Upvotes: 1

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