Need to Tokenize a piece of text and add the entries to the class's counts.
Fixes the vocabulary as static, prevents keeping additional vocab from
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.
17 pekerja bebas membida secara purata $28 untuk pekerjaan ini
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