Book Image

Mastering spaCy

By : Duygu Altınok
Book Image

Mastering spaCy

By: Duygu Altınok

Overview of this book

spaCy is an industrial-grade, efficient NLP Python library. It offers various pre-trained models and ready-to-use features. Mastering spaCy provides you with end-to-end coverage of spaCy's features and real-world applications. You'll begin by installing spaCy and downloading models, before progressing to spaCy's features and prototyping real-world NLP apps. Next, you'll get familiar with visualizing with spaCy's popular visualizer displaCy. The book also equips you with practical illustrations for pattern matching and helps you advance into the world of semantics with word vectors. Statistical information extraction methods are also explained in detail. Later, you'll cover an interactive business case study that shows you how to combine all spaCy features for creating a real-world NLP pipeline. You'll implement ML models such as sentiment analysis, intent recognition, and context resolution. The book further focuses on classification with popular frameworks such as TensorFlow's Keras API together with spaCy. You'll cover popular topics, including intent classification and sentiment analysis, and use them on popular datasets and interpret the classification results. By the end of this book, you'll be able to confidently use spaCy, including its linguistic features, word vectors, and classifiers, to create your own NLP apps.
Table of Contents (15 chapters)
1
Section 1: Getting Started with spaCy
4
Section 2: spaCy Features
9
Section 3: Machine Learning with spaCy

Chapter 4: Rule-Based Matching

Rule-based information extraction is indispensable for any NLP pipeline. Certain types of entities, such as times, dates, and telephone numbers have distinct formats that can be recognized by a set of rules, without having to train statistical models.

In this chapter, you will learn how to quickly extract information from the text by matching patterns and phrases. You will use morphological features, POS tags, regex, and other spaCy features to form pattern objects to feed to the Matcher objects. You will continue with fine-graining statistical models with rule-based matching to lift statistical models to better accuracies.

By the end of this chapter, you will know a vital part of information extraction. You will be able to extract entities of specific formats, as well as entities specific to your domain.

In this chapter, we're going to cover the following main topics:

  • Token-based matching
  • PhraseMatcher
  • EntityRuler
  • Combining...