Scikit-learn is one of the best machine learning libraries available in any programming language. It contains all sorts of machine learning algorithms for many different purposes, but they all follow the same fit/predict design pattern:

We won't be accessing the scikit-learn models directly in this recipe. Instead, we'll be using NLTK's SklearnClassifier class, which is a wrapper class around a scikit-learn model to make it conform to NLTK's ClassifierI interface. This means that the SklearnClassifier class can be trained and used much like the classifiers we've used in the previous recipes in this chapter.