What is the nltk.stem.util module?

Text normalization (i.e., preparing text, words and documents) is one of the most fundamental tasks of the Natural Language processing field. These text normalization techniques are called Stemming and Lemmatization. nltk.stem is one of the most widely used libraries in Python for Stemming and Lemmatization.

Examples of Stemming and Lemmatization

If you look at the words cars, car’s, CAR, Car, and cars’, you will see that all of them are derived from the rootor stem word car. If we use nltk.stem, all of these words will be mapped to car.

nltk.stem.util is one of the instances of ntlk.stem. It contains two major methods, nltk.stem.util.prefix_replace and nltk.stem.util.suffix_replace.

nltk.stem.util.prefix_replace(original, old, new)

This method shown above is used to replace the old (parameter) prefix of the original string (given as a paramater to the function) by a new (parameter) suffix. It returns a string.

Parameters

1. original – string

2. old – string

3. new – string

nltk.stem.util.suffix_replace(original, old, new)

The method above is used to replace the old (parameter) suffix of the original string (given as a parameter to the function) with a new (parameter) suffix. It returns a string.

Parameters

1. original – string

2. old – string

3. new – string