Tweak: Phrases Features containing two or more terms - phrase Problem Treading phrase as separate features results in lost meaning: San Francisco Treading phrase as a single feature results with large TF-IDF score Solution Distinguishing two kinds of relationships betweens words in the phrase by Determining occurrence of t 1 close to t 2 volume Finding a dominant word: Barak Obama=>Obama Merging words to single feature: San Francisco => San Francisco
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