Book Image

Machine Learning Techniques for Text

By : Nikos Tsourakis
Book Image

Machine Learning Techniques for Text

By: Nikos Tsourakis

Overview of this book

With the ever-increasing demand for machine learning and programming professionals, it's prime time to invest in the field. This book will help you in this endeavor, focusing specifically on text data and human language by steering a middle path among the various textbooks that present complicated theoretical concepts or focus disproportionately on Python code. A good metaphor this work builds upon is the relationship between an experienced craftsperson and their trainee. Based on the current problem, the former picks a tool from the toolbox, explains its utility, and puts it into action. This approach will help you to identify at least one practical use for each method or technique presented. The content unfolds in ten chapters, each discussing one specific case study. For this reason, the book is solution-oriented. It's accompanied by Python code in the form of Jupyter notebooks to help you obtain hands-on experience. A recurring pattern in the chapters of this book is helping you get some intuition on the data and then implement and contrast various solutions. By the end of this book, you'll be able to understand and apply various techniques with Python for text preprocessing, text representation, dimensionality reduction, machine learning, language modeling, visualization, and evaluation.
Table of Contents (13 chapters)

Extracting Sentiments from Product Reviews

Deciphering the emotional tone behind a sequence of words finds extensive utility in analyzing survey responses, customer feedback, or product reviews. In particular, the advent of social networks offered new possibilities for people to instantly express their opinions on various issues. Therefore, it is not surprising that many shareholders—such as companies, academia, or government—aim to exploit public opinion on various topics and acquire valuable insight.

This chapter focuses on another typical problem in natural language processing (NLP): the extraction of sentiment from a piece of text. For this reason, we incorporate an open source dataset with customer reviews from the Amazon online store. Exploratory Data Analysis (EDA) is again the first task in the pipeline, which helps us discuss important findings on the input data. During this phase, we create different visualizations and enhance our plot construction skills...