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Chris Albon - Machine learning with Python cookbook: practical solutions from preprocessing to deep learning

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Chris Albon Machine learning with Python cookbook: practical solutions from preprocessing to deep learning
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This practical guide provides nearly 200 self-contained recipes to help you solve machine learning challenges you may encounter in your daily work. If youre comfortable with Python and its libraries, including pandas and scikit-learn, youll be able to address specific problems such as loading data, handling text or numerical data, model selection, and dimensionality reduction and many other topics.

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Machine Learning with Python Cookbook

by Chris Albon

Copyright 2018 Chris Albon. All rights reserved.

Printed in the United States of America.

Published by OReilly Media, Inc. , 1005 Gravenstein Highway North, Sebastopol, CA 95472.

OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://oreilly.com/safari). For more information, contact our corporate/institutional sales department: 800-998-9938 or corporate@oreilly.com .

  • Editors: Rachel Roumeliotis and Jeff Bleiel
  • Production Editor: Melanie Yarbrough
  • Copyeditor: Kim Cofer
  • Proofreader: Rachel Monaghan
  • Indexer: Wendy Catalano
  • Interior Designer: David Futato
  • Cover Designer: Karen Montgomery
  • Illustrator: Rebecca Demarest
  • April 2018: First Edition
Revision History for the First Edition
  • 2018-03-09: First Release

See http://oreilly.com/catalog/errata.csp?isbn=9781491989388 for release details.

The OReilly logo is a registered trademark of OReilly Media, Inc. Machine Learning with Python Cookbook, the cover image, and related trade dress are trademarks of OReilly Media, Inc.

While the publisher and the author have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights.

978-1-491-98938-8

[LSI]

Preface

Over the last few years machine learning has become embedded in a widevariety of day-to-day business, nonprofit, and government operations.As the popularity of machine learning increased, a cottage industry ofhigh-quality literature that taught applied machine learning topractitioners developed. This literature has been highly successful intraining an entire generation of data scientists and machine learningengineers. This literature also approached the topic of machine learningfrom the perspective of providing a learning resource to teach anindividual what machine learning is and how it works. However, whilefruitful, this approach left out a different perspective on the topic:the nuts and bolts of doing machine learning day to day. That is themotivation of this booknot as a tome of machine learning knowledgefor the student but as a wrench for the professional, to sit withdog-eared pages on desks ready to solve the practical day-to-dayproblems of a machine learning practitioner.

More specifically, the book takes a task-based approach to machinelearning, with almost 200 self-contained solutions (you can copy and paste the code and itll run) for the most common tasks a datascientist or machine learning engineer building a model will runinto.

The ultimate goal is for the book to be a reference for people buildingreal machine learning systems. For example, imagine a reader has a JSONfile containing 1,000 categorical and numerical features with missing data and categorical target vectors with imbalanced classes, and wants an interpretable model. The motivation for this book is to provide recipes to help the reader learn processes such as:

The goal is for the reader to be able to:

  1. Copy/paste the code and gain confidence that it actually works withthe included toy dataset.

  2. Read the discussion to gain an understanding of the theory behind thetechnique the code is executing and learn which parameters are important to consider.

  3. Insert/combine/adapt the code from the recipes to construct the actual application.

Who This Book Is For

This book is not an introduction to machine learning. If you are notcomfortable with the basic concepts of machine learning or have neverspent time learning machine learning, do not buy this book. Instead,this book is for the machine learning practitioner who, while comfortable with the theory and concepts of machine learning, would benefit from a quick reference containing code to solve challenges he runs into working on machine learning on an everyday basis.

This book assumes the reader is comfortable with the Python programminglanguage and package management.

Who This Book Is Not For

As stated previously, this book is not an introduction to machinelearning. This book should not be your first. If you are unfamiliar withconcepts like cross-validation, random forest, and gradient descent, youwill likely not benefit from this book as much as one of the manyhigh-quality texts specifically designed to introduce you to the topic.I recommend reading one of those books and then coming back to this bookto learn working, practical solutions for machine learning.

Terminology Used in This Book

Machine learning draws upon techniques from a wide range of fields,including computer science, statistics, and mathematics. For thisreason, there is significant variation in the terminology used in thediscussions of machine learning:

Observation

A single unit in our level of observationfor example, a person, a sale, or a record.

Learning algorithms

An algorithm used to learn the best parameters of a modelfor example, linear regression, naive Bayes, or decision trees.

Models

An output of a learning algorithms training. Learningalgorithms train models, which we then use to make predictions.

Parameters

The weights or coefficients of a model learned through training.

Hyperparameters

The settings of a learning algorithm that need to be set before training.

Performance

A metric used to evaluate a model.

Loss

A metric to maximize or minimize through training.

Train

Applying a learning algorithm to data using numericalapproaches like gradient descent.

Fit

Applying a learning algorithm to data using analyticalapproaches.

Data

A collection of observations.

Acknowledgments

This book would not have been possible without the kind help of a numberof friends and strangers. Listing everyone who lent a hand to thisproject would be impossible, but I wanted to at least mention: Angela Bassa, Teresa Borcuch, Justin Bozonier, Andre deBruin, Numa Dhamani, Dan Friedman, Joel Grus, Sarah Guido, Bill Kambouroglou, Mat Kelcey, Lizzie Kumar, Hilary Parker, Niti Paudyal, Sebastian Raschka, and Shreya Shankar.

I owe them all a beer or five.

Chapter 1. Vectors, Matrices, and Arrays
1.0 Introduction

NumPy is the foundation of the Python machine learning stack. NumPyallows for efficient operations on the data structures often used inmachine learning: vectors, matrices, and tensors. While NumPy is not the focus of this book, it will show up frequently throughout the following chapters. This chapter covers the most common NumPy operations we are likely to run into while working on machine learning workflows.

1.1 Creating a Vector
Problem

You need to create a vector.

Solution

Use NumPy to create a one-dimensional array:

# Load libraryimportnumpyasnp# Create a vector as a rowvector_row=
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