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)

Visualizing parts of speech

As you saw in the Visualizing the dependency parse recipe, parts of speech are included in the dependency parse, so in order to see parts of speech for each word in a sentence, it is enough to do that. In this recipe, we will visualize part of speech counts. We will visualize the counts of past and present tense verbs in the book The Adventures of Sherlock Holmes.

Getting ready

We will use the spacy package for text analysis and the matplotlib package to create the graph. If you don't have matplotlib installed, install it using the following command:

pip install matplotlib

How to do it…

We will create a function that will count the number of verbs by tense and plot each on a bar graph:

  1. Import the necessary packages:
    import spacy
    import matplotlib.pyplot as plt
    from Chapter01.dividing_into_sentences import read_text_file
  2. Load the spacy engine and define the past and present tag sets:
    nlp = spacy.load("en_core_web_sm...