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Attempt to generate a thesaurus automatically by analyzing the collection of documents
Fundamental notion: similarity between two words
Definition 1: Two words are similar if they co-occur with similar words.
Definition 2: Two words are similar if they occur in a given grammatical relation with the same words.
You can harvest, peel, eat, prepare, etc. apples and pears, so apples and pears must be similar.
Co-occurrence based is more robust, grammatical relations are more accurate.
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