We first came to focus on what is now known as reinforcement learning in late 1979. We were both at the University of Massachusetts working on one of the earliest projects to revive the old idea that networks of neuron-like adaptive elements might prove to be a promising approach to artificial adaptive intelligence. The project explored the ``heterostatic theory of adaptive systems" developed by A. Harry Klopf. Harry's work was a rich source of ideas, and we were permitted to explore them critically and compare them with the long history of prior work in adaptive systems. Our task became one of teasing the ideas apart and understanding their relationships and relative importance. This continues to this day, but in 1979 we came to realize that perhaps the simplest of the ideas, which had long been taken for granted, had in fact received relatively little attention from a computational perspective. This was simply the idea of a learning system that wants something, that adapts its behavior in order to maximize a special signal from its environment. This was the idea of a ``hedonistic" learning system, or, as we would say now, the idea of reinforcement learning.
Like others, we had a sense that reinforcement learning had been thoroughly explored in the early days of artificial intelligence and cybernetics. On closer inspection, though, we found that it had been explored only slightly. We found that while reinforcement learning had clearly motivated some of the earliest computational studies of learning, some of which were most impressive, most of these researchers had gone on to other things, such as pattern classification, supervised learning, adaptive control, or they had abandoned the study of learning altogether. As a result, the special issues involved in learning how to get something from the environment received relatively little attention. In retrospect, focusing on this idea was the critical step that set this branch of research in motion. Little progress could be made in the computational study of reinforcement learning until it was recognized that such a fundamental idea had not yet been thoroughly explored.
The field has come a long way since then, evolving and maturing in several directions. Reinforcement learning has gradually become one of the most active research areas in machine learning, artificial intelligence, and neural-network research. The field has developed strong mathematical foundations and impressive applications. The overall problem of learning from interaction to achieve goals is still far from being solved, but our understanding of it has improved significantly. We can now place component ideas, such as temporal-difference learning, dynamic programming, and function approximation, within a coherent perspective with respect to the overall problem. The computational study of reinforcement learning is now a large field, with hundreds of active researchers around the world in diverse disciplines such as psychology, control theory, artificial intelligence, and neuroscience. Particularly important have been the contributions establishing and developing the relationships to the theory of optimal control and dynamic programming.
Our goal in writing this book is to provide a clear and simple account of the key ideas and algorithms of reinforcement learning. We wanted our treatment to be accessible to readers in all of the related disciplines, but we could not cover all of these perspectives in detail. Our treatment takes almost exclusively the point of view of artificial intelligence and engineering, leaving coverage of connections to psychology, neuroscience, and other fields to others or to another time. We also chose not to produce a rigorous formal treatment of reinforcement learning. We did not reach for the highest possible level of mathematical abstraction and did not rely on a theorem-proof format. We tried to choose a level of mathematical detail that points the mathematically inclined in the right directions without distracting from the simplicity and potential generality of the underlying ideas.
The book consists of three parts. Part I is introductory and problem oriented. We focus on the simplest aspects of reinforcement learning and on its main distinguishing features. One full chapter is devoted to introducing the reinforcement learning problem whose solution we explore in the rest of the book. Part II presents what we see as the three most important elementary solution methods: dynamic programming, simple Monte Carlo methods, and temporal-difference learning. The first of these is a planning method and assumes explicit knowledge of all aspects of a problem, whereas the other two are learning methods. Part III is concerned with generalizing these methods and blending them together. Eligibility traces allow unification of Monte Carlo and temporal-difference methods, and function approximators such as artificial neural networks extend all the methods so that they can be applied to much larger problems. We bring planning and learning methods together again and relate them to heuristic search. Finally, we present several case studies, including some of the most impressive applications of reinforcement learning to date, and briefly discuss some of the open problems and near-future prospects for reinforcement learning.
This book was designed to be used as a text in a one-semester course, perhaps
supplemented by readings from the literature or by a more mathematical text such
as the excellent one by Bertsekas and Tsitsiklis (1996). This book can also be
used as part of a broader course on machine learning, artificial intelligence,
or neural networks. In this case, it may be desirable to cover only a subset of
the material. We recommend covering Chapter 1 for a brief overview, Chapter 2
through Section 2.2, all of the non-starred sections of Chapter 3, and then
selecting sections from the remaining chapters according to time and interests.
Chapters 4, 5, and 6 build on each other and are best covered in sequence, but of
these, Chapter 6 is the most important for the subject and for the rest of the
book. A course focusing on machine learning or neural networks should cover
Chapter 8, and a course focusing on artificial intelligence or planning should
cover Chapter 9. Chapter 10 should almost always be covered because it is very
short and summarizes the overall unified view of reinforcement learning methods
developed in the book. Throughout the book, sections that are more difficult and
not essential to the rest of the book are marked with a
. These can be omitted on first reading without creating problems later on.
Some exercises are also marked with a
to indicate that they are more advanced and not essential to understanding the
basic material of the chapter.
The book is largely self-contained. The only mathematical background assumed is familiarity with elementary concepts of probability, such as expectations of random variables. Chapter 8 is substantially easier to digest if the reader already has some familiarity with artificial neural networks or some other kind of supervised learning method, but it can also be read without prior background. We strongly recommend working the exercises provided throughout the book. Solution manuals are available to instructors. This and other related and timely material is available via internet web sites.
At the end of most chapters is a section entitled ``Bibliographical and Historical Remarks" wherein we credit the sources of the ideas presented in that chapter, provide pointers to further reading and ongoing research, and describe relevant historical background. Despite our attempts to make these sections authoritative and complete, we have undoubtedly left out some important prior work. For that we apologize and welcome corrections and extensions for incorporation into a later edition.
In some sense we have been working towards this book for twenty years, and we have lots of people to thank. First, we thank those who have personally helped us develop the overall view presented in this book: Harry Klopf for helping us recognize that reinforcement learning needed to be revived; Chris Watkins, Dimitri Bertsekas, John Tsitsiklis, and Paul Werbos for helping us see the value of the relationships to dynamic programming; John Moore and Jim Kehoe for insights and inspirations from animal learning theory; Oliver Selfridge for emphasizing the breadth and importance of adaptation; and, more generally, our colleagues and students who have contributed in countless ways: Ron Williams, Charles Anderson, Satinder Singh, Steve Bradtke, Bob Crites, Peter Dayan, and Leemon Baird. Our view of reinforcement learning has also been significantly enriched by discussions with Paul Cohen, Paul Utgoff, Martha Steenstrup, Gerry Tesauro, Mike Jordan, Leslie Kaelbling, Andrew Moore, Chris Atkeson, Tom Mitchell, Nils Nilsson, Tom Dean, and Bob Narendra. We thank the the Air Force Office of Scientific Research, the National Science Foundation, and GTE Laboratories for their long and far-sighted support.
We also wish to thank the many people who have read drafts of this book and provided valuable comments, including: Tom Kalt, John Tsitsiklis, Pawel Cichosz, Olle Gällmo, Chuck Anderson, Stuart Russell, Paul Cohen, Jette Randlov, Brian Sheppard, Thomas O'Connell, Richard Coggins, Cristina Versino, John H. Hiett, Andreas Badelt, Jay Ponte, Joe Beck, Justus Piater, Martha Steenstrup, Satinder Singh, Tommi Jaakkola, Dimitri Bertsekas, Ben Van Roy, Torbjörn Ekman, Christina Björkman, Jakob Carlström, and Olle Palmgren. Finally, we thank Gwyn Mitchell for helping in many ways, and Harry Stanton and Bob Prior for being our champions at MIT Press.