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  3. Introduction to Natural Language Processing in Python

Exercise

Training and testing the "fake news" model with TfidfVectorizer

Now that you have evaluated the model using the CountVectorizer, you'll do the same using the TfidfVectorizer with a Naive Bayes model.

The training and test sets have been created, and tfidf_vectorizer, tfidf_train, and tfidf_test have been computed. Additionally, MultinomialNB and metrics have been imported from, respectively, sklearn.naive_bayes and sklearn.

Instructions

100 XP
  • Instantiate a MultinomialNB classifier called nb_classifier.
  • Fit the classifier to the training data.
  • Compute the predicted tags for the test data.
  • Calculate and print the accuracy score of the classifier.
  • Compute the confusion matrix. As in the previous exercise, specify the keyword argument labels=['FAKE', 'REAL'] so that the resulting confusion matrix is easier to read.