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Exercise

Size of vocabulary of movies reviews

In this exercise, you will practice different ways to limit the size of the vocabulary using a sample of the movies reviews dataset. The first column is the review, which is of type object and the second column is the label, which is 0 for a negative review and 1 for a positive one.

The three methods that you will use will transform the text column to new numeric columns, capturing the count of a word or a phrase in each review. Each method will ultimately result in building a different number of new features.

Instructions 1/3

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  • 1

    Using the movies dataset, limit the size of the vocabulary to 100.

  • 2

    Using the movies dataset, limit the size of the vocabulary to include terms which occur in no more than 200 documents.

  • 3

    Using the movies dataset, limit the size of the vocabulary to ignore terms which occur in less than 50 documents.