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)

Performing named entity recognition using spaCy

In this recipe, we will parse out named entities from an article text used in Chapter 4, Classifying Texts. We will load the package and the parsing engine, and loop through the NER results.

Getting ready

In this recipe, we will use the spacy package. If you haven't installed it yet, install it using the following command:

pip install spacy

After you install spaCy, you will need to download a language model. We will download the small model:

python -m spacy download en_core_web_sm

How to do it…

The NER happens automatically with the processing that spaCy does for an input text. Accessing the entities happens through the doc.ents variable. The steps for this recipe are as follows:

  1. Import spacy:
    import spacy
  2. Initialize the spaCy engine:
    nlp = spacy.load("en_core_web_sm")
  3. Initialize the article text:
    article = """iPhone 12: Apple makes jump to 5G
    Apple has confirmed its...