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Artificial-Intelligence-A-Modern-Approach-3rd-Edition (1).pdf )
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Artificial-Intelligence-A-Modern-Approach-3rd-Edition
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Vice President and Editorial Director, ECS: Marcia 1. Horton
Editor-in-Chief: Michael Hirsch
Executive Editor: Tracy Dunkelberger
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CopyrighttQ 2010, 2003, 1995 by Pearson Education, Inc.,
Upper Saddle River, New Jersey 07458.
All rights reserved. Manufactured in the United States of
America.
This publication is protected by
Copyright and permissions should be obtained from the publisher prior to any prohibited reproduction,
storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical,
photocopying, recording. or likewise. 'lb obtain
permission(s)
to use
matenals from this work, please
submit a written request to Pearson Higher Education. Permissions Department. 1 Lake Street. Upper
Saddle River,
NI
07458.
The author and publisher of this book have used their best efforts in preparing this hook. These
efforts include the development, research, and testing of the theories and programs to determine their
effectiveness. The author and publisher make no warranty of any kind, expressed or implied, with
regard to these programs or the documentation contained in this book. The author and publisher shall
not be liable in any event for incidental or consequential damages in connection with, or arising out
of, the furnishing, performance, or use of these programs.
Library of Congress Cataloging-in-Publication Data on File
Prentice Hall
is an imprint of
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www.pearsonhighered.com
ISBN-10:
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For Loy, Gordon, Lucy, George, and Isaac
S.J.R.
For Kris, Isabella, and Juliet
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Preface
Artificial Intelligence (AI) is a big field, and this is a big book. We have tried to explore the
full breadth of the field, which encompasses logic, probability, and continuous mathematics;
perception, reasoning, learning, and action; and everything from microelectronic devices to
robotic planetary explorers. The book is also big because we go into some depth.
The subtitle of this book is "A Modern Approach." The intended meaning of this rather
empty phrase is that we have tried to synthesize what is now known into a common frame-
work, rather than trying to explain each subfield of AI in its own historical context. We
apologize to those whose subfields are, as a result, less recognizable.
New to this edition
This edition captures the changes in Al that have taken place since the last edition in 2003.
There have been important applications of AI technology, such as the widespread deploy-
ment of practical speech recognition, machine translation autonomous vehicles, and house-
hold robotics. There have been algorithmic landmarks, such as the solution of the game of
checkers. And there has been a great deal of theoretical progress, particularly in areas such
as probabilistic reasoning, machine learning, and computer vision. Most important from our
point of view is the continued evolution in how we think about the field, and thus how we
organize the book. The major changes are as follows:
• We place more emphasis on partially observable and nondeterministic environments,
especially in the nonprobabilistic settings of search and planning. The concepts of
belief state
(a set of possible worlds) and
stare
estimation (maintaining the belief state)
are introduced in these settings; later in the book, we add probabilities.
•
In addition to discussing the types of environments and types of agents, we now cover
in more depth the types of
representations that an agent can use. We distinguish among
atomic
representations (in which each slate of the world is treated as a black box),
factored
representations (in which a state is a
set
of attribute/value pairs), and
structured
representations (in which the world consists of objects and relations between them).
•
Our coverage of planning goes into more depth on contingent planning in partially
observable environments and includes a new approach to hierarchical planning.
•
We have added new material on first-order probabilistic models, including
open-universe
models for cases where there is uncertainty as to what objects exist.
• We have completely rewritten the introductory
machine-learning
chapter, stressing a
wider variety of more
modern
learning algorithms and placing them on a firmer theo-
retical footing.
•
We have expanded coverage of Web search and information extraction, and of tech-
niques for learning from very large data sets.
•
20% of the citations in this edition are to works published after 2003.
•
We estimate that about
20%
of the material is brand new. The remaining SO% reflects
older work but has been largely rewritten to present a more unified picture of the field.
vii
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