Machine Learning Algorithms

NLTK and built-in corpora

Natural Language Toolkit (NLTK) is a very powerful Python framework that implements most NLP algorithms and will be adopted in this chapter together with scikit-learn. Moreover, NLTK provides some built-in corpora that can be used to test algorithms. Before starting to work with NLTK, it's normally necessary to download all the additional elements (corpora, dictionaries, and so on) using a specific graphical interface. This can be done in the following way:

import nltk>>> nltk.download()

This command will launch the user interface, as shown in the following figure:

It's possible to select every single feature or ...