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You're reading from Python Data Science Essentials Learn the fundamentals of Data Science with Python

Product type Paperback

Published in Oct 2016

Publisher Packt

ISBN-13 9781786462138

Length 378 pages

Edition 2nd Edition

Languages

Python

Concepts

Data Science

Authors (2):

Alberto Boschetti

Luca Massaron

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Table of Contents (8) Chapters

Preface

1. First Steps

2. Data Munging FREE CHAPTER

3. The Data Pipeline

4. Machine Learning

5. Social Network Analysis

6. Visualization, Insights, and Results

1. Strengthen Your Python Foundations

A peek at Natural Language Processing (NLP)

This section is not strictly related to machine learning, but it contains some machine learning results in the area of Natural Language Processing. Python has many toolkits to process text data, but the most powerful and complete toolkit is NLTK, the Natural Language Tool Kit.

In the following sections, we'll explore its core functionalities. We will work on the English language; for other languages, you will first need to download the language corpora (note that sometimes languages have no free open source corpora for NLTK).

Refer to the official website of NLTK data, http://www.nltk.org/nltk_data/, to have access to corporas and lexical resources in many languages, ready to work with NLTK.

Word tokenization

Tokenization is the action of splitting text into words. Chunking whitespace seems very easy, but it's not, because text contains punctuation and contractions. Let's start with an example:

In: my_text = "The coolest job in the next 10 years will...

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Authors (2)

Alberto Boschetti

Alberto Boschetti is a data scientist with expertise in signal processing and statistics. He holds a Ph.D. in telecommunication engineering and currently lives and works in London. In his work projects, he faces challenges ranging from natural language processing (NLP) and behavioral analysis to machine learning and distributed processing. He is very passionate about his job and always tries to stay updated about the latest developments in data science technologies, attending meet-ups, conferences, and other events.

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Luca Massaron

Luca Massaron is a data scientist with over a decade of experience in transforming data into high-impact, innovative artifacts, solving real-world problems, and generating value for businesses and stakeholders. He is the author of numerous bestselling books on AI, machine learning, and algorithms. Luca is also a 3x Kaggle Grandmaster who reached number 7 in the worldwide user rankings for his performance in data science competitions. Additionally, he is recognized as a Google Developer Expert (GDE) in AI, Kaggle, and the cloud.

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