2023:Word Match (Value Extractor)

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The Word Match is an Extractor Type found in Grooper. This extractor is designed to collect full words and is often used in n-gram extraction.

About

The Word Match extractor is designed for n-gram extraction. An n-gram is "a contiguous sequence of n items from a given sample of text or speech." [1] Typically in Grooper, this refers to extracting words or phrases from a lexicon of terms.

Grooper generally uses n-grams for the purpose of feature collection for Lexical Classification. The Word Match extractor can capture 1-grams (single words) up to 5-grams (five word phrases). Lexicons are commonly used to dictate a dictionary of allowable returned words. This could be general Lexicon of common English words or a custom Lexicon, such as one with industry specific terms.

FYI

An n-gram is often referred to by a different name depending its n size. 1-grams (single words) - unigrams 2-grams (word pairs) - bigrams 3-grams (three word phrases) - trigrams 4-grams (four word phrases) - four-grams 5-grams (five word phrases) - five-grams As an additional FYI, four-grams are not called "tetragrams" because the term already has usage as a single word consisting of four letters or characters. "Quadrigram" is occasionally used, but four-gram is the more common terminology. Five-grams are not called "pentagrams", because that already has common usage for a geometric figure.

How To

Setup

First, let's set the Word Match extractor on a Data Type.

Adding a Lexicon

You can add a Lexicon to a Word Match to aid in extraction. Word Match often collects "words" that aren't actually in the English language. Let's say you want to change to to only collect words that are included in the Engish dictionary.

Changing the N-Gram

By default the Word Match extractor collects single words or unigrams. Let's say you want to change this to bigrams, trigrams, four-grams, etc. We can do this from the "Properties" tab on the extractor window.