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)

Training your own NER model with spaCy

The NER model provided by spaCy can suffice in many cases. There might be other times, however, when we would like to augment the existing model or create a new one from scratch. spaCy has a toolset specifically for that, and in this recipe, we will do both.

Getting ready

We will use the spacy package to train a new NER model. You do not need any other packages than spacy.

How to do it…

We will define our training data and then use it to update an existing model. We will then test the model and save it to disk. The code in this recipe is based on the spaCy documentation (https://spacy.io/usage/training#ner). The steps for this recipe are as follows:

  1. Import the necessary packages:
    import spacy
    from spacy.util import minibatch, compounding
    from spacy.language import Language
    import warnings
    import random
    from pathlib import Path
  2. Now we will define the training data that we will use:
    DATA = [
        ...