wink-ner

Language agnostic named entity recognizer

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Recognize named entities in a sentence using wink-ner. It is a smart Gazetteer-based Named Entity Recognizer (NER), which can be easily trained to suite specific needs. For example, the wink-ner can differentiate between Manchester United & Manchester in a single sentence and tag them as a club and city respectively.

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Use npm to install:

npm install wink-ner --save

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#### Named Entity Recognition
``javascript
// Load wink ner.
var ner = require( 'wink-ner' );
// Create your instance of wink ner & use default config.
var myNER = ner();
// Define training data.
var trainingData = [
{ text: 'manchester united', entityType: 'club', uid: 'manu' },
{ text: 'manchester', entityType: 'city' },
{ text: 'U K', entityType: 'country', uid: 'uk' }
];
// Learn from the training data.
myNER.learn( trainingData );
// Since recognize() requires tokens, use wink-tokenizer.
var winkTokenizer = require( 'wink-tokenizer' );
// Instantiate it and extract tokenize() api.
var tokenize = winkTokenizer().tokenize;
// Tokenize the sentence.
var tokens = tokenize( 'Manchester United is a football club based in Manchester, U. K.' );
// Simply Detect entities!
tokens = myNER.recognize( tokens );
console.log( tokens );
// -> [
// { entityType: 'club', uid: 'manu', originalSeq: [ 'Manchester', 'United' ],
// value: 'manchester united', tag: 'word' },
// { value: 'is', tag: 'word' },
// { value: 'a', tag: 'word' },
// { value: 'football', tag: 'word' },
// { value: 'club', tag: 'word' },
// { value: 'based', tag: 'word' },
// { value: 'in', tag: 'word' },
// { entityType: 'city', value: 'Manchester', tag: 'word',
// originalSeq: [ 'Manchester' ], uid: 'manchester' },
// { value: ',', tag: 'punctuation' },
// { entityType: 'country', uid: 'uk', originalSeq: [ 'U', '.', 'K' ],
// value: 'u k', tag: 'word' },
// { value: '.', tag: 'punctuation' }
// ]
`
#### Integration with POS Tagging
The tokens returned from recognize() may be further passed down to tag() api of wink-pos-tagger for pos tagging.

Just in case you need to assign a specific pos tag to an entity, the same can be achieved by including a property pos in the entity definition and assigning it the desired pos tag (e.g. 'NNP'); the wink-pos-tagger will automatically do the needful. For details please refer to learn() api of wink-ner.

`javascript
// Load pos tagger.
var tagger = require( 'wink-pos-tagger' );
// Instantiate it and extract tag api.
var tag = tagger().tag;
tokens = tag( tokens );
console.log( tokens );
// -> [ { entityType: 'club', uid: 'manu', originalSeq: [ 'Manchester', 'United' ],
// value: 'manchester united', tag: 'word', normal: 'manchester united', pos: 'NNP' },
// { value: 'is', tag: 'word', normal: 'is', pos: 'VBZ', lemma: 'be' },
// { value: 'a', tag: 'word', normal: 'a', pos: 'DT' },
// { value: 'football', tag: 'word', normal: 'football', pos: 'NN', lemma: 'football' },
// { value: 'club', tag: 'word', normal: 'club', pos: 'NN', lemma: 'club' },
// { value: 'based', tag: 'word', normal: 'based', pos: 'VBN', lemma: 'base' },
// { value: 'in', tag: 'word', normal: 'in', pos: 'IN' },
// { value: 'Manchester', tag: 'word', originalSeq: [ 'Manchester' ],
// uid: 'manchester', entityType: 'city', normal: 'manchester', pos: 'NNP' },
// { value: ',', tag: 'punctuation', normal: ',', pos: ',' },
// { entityType: 'country', uid: 'uk', originalSeq: [ 'U', '.', 'K' ],
// value: 'u k', tag: 'word', normal: 'u k', pos: 'NNP' },
// { value: '.', tag: 'punctuation', normal: '.', pos: '.' }
// ]

``

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Check out the named entity recognizer API documentation to learn more.

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If you spot a bug and the same has not yet been reported, raise a new issue or consider fixing it and sending a pull request.

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Wink is a family of open source packages for Statistical Analysis, Natural Language Processing and Machine Learning in NodeJS. The code is thoroughly documented for easy human comprehension and has a test coverage of ~100% for reliability to build production grade solutions.

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wink-ner is copyright 2017-20 GRAYPE Systems Private Limited.

It is licensed under the terms of the MIT License.