Book Image

Hands-On Natural Language Processing with PyTorch 1.x

By : Thomas Dop
Book Image

Hands-On Natural Language Processing with PyTorch 1.x

By: Thomas Dop

Overview of this book

In the internet age, where an increasing volume of text data is generated daily from social media and other platforms, being able to make sense of that data is a crucial skill. With this book, you’ll learn how to extract valuable insights from text by building deep learning models for natural language processing (NLP) tasks. Starting by understanding how to install PyTorch and using CUDA to accelerate the processing speed, you’ll explore how the NLP architecture works with the help of practical examples. This PyTorch NLP book will guide you through core concepts such as word embeddings, CBOW, and tokenization in PyTorch. You’ll then learn techniques for processing textual data and see how deep learning can be used for NLP tasks. The book demonstrates how to implement deep learning and neural network architectures to build models that will allow you to classify and translate text and perform sentiment analysis. Finally, you’ll learn how to build advanced NLP models, such as conversational chatbots. By the end of this book, you’ll not only have understood the different NLP problems that can be solved using deep learning with PyTorch, but also be able to build models to solve them.
Table of Contents (14 chapters)
1
Section 1: Essentials of PyTorch 1.x for NLP
7
Section 3: Real-World NLP Applications Using PyTorch 1.x

Chapter 4: Text Preprocessing, Stemming, and Lemmatization

Textual data can be gathered from a number of different sources and takes many different forms. Text can be tidy and readable or raw and messy and can also come in many different styles and formats. Being able to preprocess this data so that it can be converted into a standard format before it reaches our NLP models is what we'll be looking at in this chapter.

Stemming and lemmatization, similar to tokenization, are other forms of NLP preprocessing. However, unlike tokenization, which reduces a document into individual words, stemming and lemmatization are attempts to reduce these words further to their lexical roots. For example, almost any verb in English has many different variations, depending on tense:

He jumped

He is jumping

He jumps

While all these words are different, they all relate to the same root word – jump. Stemming and lemmatization are both techniques we can use to reduce word variations...