ImportError: cannot import name cross_validation

by

This happens because there is no cross_validation object in sklearn. You’re likely looking for something more like the cross_validate function. You can access that through

from sklearn.model_selection import cross_validate

However, you don’t need to import any cross-validation software to perform the train-test split, since that will just randomly sample from the data. Try

from sklearn.model_selection import train_test_split

followed by

features_train, features_test, labels_train, labels_test = train_test_split(word_data, authors, test_size=0.1, random_state=42)

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