Book Image

Python Natural Language Processing Cookbook

By : Zhenya Antić
Book Image

Python Natural Language Processing Cookbook

By: Zhenya Antić

Overview of this book

Python is the most widely used language for natural language processing (NLP) thanks to its extensive tools and libraries for analyzing text and extracting computer-usable data. This book will take you through a range of techniques for text processing, from basics such as parsing the parts of speech to complex topics such as topic modeling, text classification, and visualization. Starting with an overview of NLP, the book presents recipes for dividing text into sentences, stemming and lemmatization, removing stopwords, and parts of speech tagging to help you to prepare your data. You’ll then learn ways of extracting and representing grammatical information, such as dependency parsing and anaphora resolution, discover different ways of representing the semantics using bag-of-words, TF-IDF, word embeddings, and BERT, and develop skills for text classification using keywords, SVMs, LSTMs, and other techniques. As you advance, you’ll also see how to extract information from text, implement unsupervised and supervised techniques for topic modeling, and perform topic modeling of short texts, such as tweets. Additionally, the book shows you how to develop chatbots using NLTK and Rasa and visualize text data. By the end of this NLP book, you’ll have developed the skills to use a powerful set of tools for text processing.
Table of Contents (10 chapters)

Parts of speech tagging

In many cases, NLP processing depends on determining the parts of speech of the words in the text. For example, in sentence classification, we sometimes use the parts of speech of the words as a feature that is input to the classifier. In this recipe, we will again consider the NLTK and spaCy algorithms.

Getting ready

For this recipe, we will be using the same text of the book The Adventures of Sherlock Holmes. You can find the whole text in the book's GitHub. For this recipe, we will need just the beginning of the book, which can be found in the sherlock_holmes_1.txt file.

In order to do this task, you will need the spaCy package, described in the Technical requirements section.

How to do it…

In this recipe, we will use the spaCy package to label words with their parts of speech, and I will show that it is superior to NLTK in this task.

The process is as follows:

  1. Import the spacy package:
    import spacy
  2. Read in the book...