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Learning TensorFlow
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Learning TensorFlow by Tom Hope, Yehezkel S. Resheff, and Itay Lieder Copyright © 2017 Tom Hope, Itay Lieder, and Yehezkel S. Resheff. All rights reserved. Printed in the United States of America. Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O’Reilly 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/insti‐ tutional sales department: 800-998-9938 or corporate@oreilly.com
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978-1-491-97851-1
[LSI]
Learning TensorFlow
by Tom Hope, Yehezkel S. Resheff, and Itay Lieder
Copyright © 2017 Tom Hope, Itay Lieder, and Yehezkel S. Resheff. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
O’Reilly 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/insti‐
tutional sales department: 800-998-9938 or corporate@oreilly.com.
Editor: Nicole Tache
Production Editor: Shiny Kalapurakkel
Copyeditor: Rachel Head
Proofreader: Sharon Wilkey
Indexer: Judith McConville
Interior Designer: David Futato
Cover Designer: Karen Montgomery
Illustrator: Rebecca Demarest
August 2017: First Edition
Revision History for the First Edition
2017-08-04: First Release
2017-09-15: Second Release
The O’Reilly logo is a registered trademark of O’Reilly Media, Inc. Learning TensorFlow, the cover image,
and related trade dress are trademarks of O’Reilly Media, Inc.
While the publisher and the authors have used good faith efforts to ensure that the information and
instructions contained in this work are accurate, the publisher and the authors 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.
www.allitebooks.com
Table of Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
1.
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Going Deep 1
Using TensorFlow for AI Systems 2
TensorFlow: What’s in a Name? 5
A High-Level Overview 6
Summary 8
2.
Go with the Flow: Up and Running with TensorFlow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installing TensorFlow 9
Hello World 11
MNIST 13
Softmax Regression 14
Summary 21
3.
Understanding TensorFlow Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Computation Graphs 23
What Is a Computation Graph? 23
The Benefits of Graph Computations 24
Graphs, Sessions, and Fetches 24
Creating a Graph 25
Creating a Session and Running It 26
Constructing and Managing Our Graph 27
Fetches 29
Flowing Tensors 30
Nodes Are Operations, Edges Are Tensor Objects 30
Data Types 32
iii
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