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 NER

To visualize named entities, we will again use displacy, the same visualization engine that we used for the visualization of dependency parses.

Getting ready

For this recipe, you will need spacy. If you don't have it installed, install it using the following command:

pip install spacy

How to do it…

We will use spacy to parse the sentence and then the displacy engine to visualize the named entities. The steps are as follows:

  1. Import both spacy and displacy:
    import spacy
    from spacy import displacy
  2. Load the spacy engine:
    nlp = spacy.load('en_core_web_sm')
  3. Define the visualize function, which will create the dependency parse visualization:
    def visualize(doc):
        colors = {"ORG":"green", "PERSON":"yellow"}
        options = {"colors": colors}
        displacy.serve(doc, style='ent', options=options)
  4. Define a...