FAQ: Term Frequency–Inverse Document Frequency - Breaking It Down Part II: Inverse Document Frequency

This community-built FAQ covers the “Breaking It Down Part II: Inverse Document Frequency” exercise from the lesson “Term Frequency–Inverse Document Frequency”.

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This exercise can be found in the following Codecademy content:

Natural Language Processing

FAQs on the exercise Breaking It Down Part II: Inverse Document Frequency

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“The important take away from the equation is that as the number of documents with the term t increases, the inverse document frequency decreases (due to the nature of the log function).”

This does not seem to be true given the formula. If you increase the number of documents with the term ‘t’, you are also increasing the total number of documents. If the numerator and denominator both change the same amount, the fraction would be the same.

For getting Inverse Document Frequency, why is do you only need to fit the transformer? Why do you not need to transform it too?