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Python class that builds a vocabulary and computes tf-idf scores

Tokenize a piece of text and add the entries to the class's counts.

Fixes the vocabulary as static, prevents keeping additional vocab from

being added

Return the frequence of a word if it's in the vocabulary, zero otherwise.

Compute the inverse document frequency of a word. Return 0.0 if

the word has never been seen.

Skills: Python, Software Architecture

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