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机器学习-实用案例解析

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标签: AI

人工智能(Artificial Intelligence),英文缩写为AI。它是研究、开发用于模拟、延伸和扩展人的智能的理论、方法、技术及应用系统的一门新的技术科学。

人工智能

人工智能(Artificial Intelligence),英文缩写为AI。它是研究、开发用于模拟、延伸和扩展人的智能的理论、方法、技术及应用系统的一门新的技术科学。 人工智能是计算机科学的一个分支,它企图了解智能的实质,并生产出一种新的能以人类智能相似的方式做出反应的智能机器,该领域的研究包括机器人、语言识别、图像识别、自然语言处理和专家系统等。人工智能从诞生以来,理论和技术日益成熟,应用领域也不断扩大,可以设想,未来人工智能带来的科技产品,将会是人类智慧的“容器”。

机器学习-实用案例解析

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wwwitebooksinfo wwwitebooksinfo Machine Learning for Hackers Drew Conway and John Myles White wwwitebooksinfo Machine Learning for Hackers by Drew Conway and John Myles White Copyright 2012 Drew Conway and John Myles White 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 ht......

www.it-ebooks.info www.it-ebooks.info Machine Learning for Hackers Drew Conway and John Myles White www.it-ebooks.info Machine Learning for Hackers by Drew Conway and John Myles White Copyright © 2012 Drew Conway and John Myles White. 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://my.safaribooksonline.com). For more information, contact our corporate/institutional sales department: (800) 998-9938 or corporate@oreilly.com. Editor: Julie Steele Production Editor: Melanie Yarbrough Copyeditor: Genevieve d’Entremont Proofreader: Teresa Horton Indexer: Angela Howard Cover Designer: Karen Montgomery Interior Designer: David Futato Illustrator: Robert Romano February 2012: First Edition. Revision History for the First Edition: 2012-02-06 First release See http://oreilly.com/catalog/errata.csp?isbn=9781449303716 for release details. Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly Media, Inc. Machine Learning for Hackers, the cover image of a griffon vulture, and related trade dress are trademarks of O’Reilly Media, Inc. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and O’Reilly Media, Inc., was aware of a trademark claim, the designations have been printed in caps or initial caps. While every precaution has been taken in the preparation of this book, the publisher and authors assume no responsibility for errors or omissions, or for damages resulting from the use of the information con- tained herein. ISBN: 978-1-449-30371-6 [LSI] 1328629742 www.it-ebooks.info Table of Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii R for Machine Learning 1. Using R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 5 8 9 12 27 Downloading and Installing R IDEs and Text Editors Loading and Installing R Packages R Basics for Machine Learning Further Reading on R 2. Data Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 29 30 34 36 37 37 40 41 44 61 Exploration versus Confirmation What Is Data? Inferring the Types of Columns in Your Data Inferring Meaning Numeric Summaries Means, Medians, and Modes Quantiles Standard Deviations and Variances Exploratory Data Visualization Visualizing the Relationships Between Columns This or That: Binary Classification Moving Gently into Conditional Probability Writing Our First Bayesian Spam Classifier 3. Classification: Spam Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 73 77 78 85 88 90 Defining the Classifier and Testing It with Hard Ham Testing the Classifier Against All Email Types Improving the Results iii www.it-ebooks.info
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