《reinforcement learning:an introduction》第一章《The Reinforcement Learning Problem》总结

本文是对Sutton的《reinforcement learning:an introduction》第一章的总结,介绍了强化学习的基本概念,如无监督学习的区别、环境互动、延迟反馈、探索与利用的权衡。强调了价值函数和策略在RL中的作用,对比了进化算法和RL的效率,并通过井字游戏示例解释了传统方法的局限性。同时概述了RL的历史和四个主要子元素:策略、奖励信号、价值函数及环境模型。

由于组里新同学进来,需要带着他入门RL,选择从silver的课程开始。

对于我自己,增加一个仔细阅读《reinforcement learning:an introduction》的要求。

因为之前读的不太认真,这一次希望可以认真一点,将对应的知识点也做一个简单总结。



Reinforcement learning problems involve learning what to do - how to map situations to actions - so as to maximize a numerical reward signal.


RL is different from supervised learning/unsupervised learning.

There is no supervisor (to tell what is best!), only a reward signal, must discover which actions yield the most reward by trying them out

action influence the environment and sub-sequential data; data distribution is not iid

Feedback is (sometimes) delayed, not instantaneous

trade-off between exploration and exploitation

for stochastic task, each action must be tried many times to gain a reliable estimate of its expected reward


The authoritative textbook for reinforcement learning by Richard Sutton and Andrew Barto. Contents Preface Series Forward Summary of Notation I. The Problem 1. Introduction 1.1 Reinforcement Learning 1.2 Examples 1.3 Elements of Reinforcement Learning 1.4 An Extended Example: Tic-Tac-Toe 1.5 Summary 1.6 History of Reinforcement Learning 1.7 Bibliographical Remarks 2. Evaluative Feedback 2.1 An -Armed Bandit Problem 2.2 Action-Value Methods 2.3 Softmax Action Selection 2.4 Evaluation Versus Instruction 2.5 Incremental Implementation 2.6 Tracking a Nonstationary Problem 2.7 Optimistic Initial Values 2.8 Reinforcement Comparison 2.9 Pursuit Methods 2.10 Associative Search 2.11 Conclusions 2.12 Bibliographical and Historical Remarks 3. The Reinforcement Learning Problem 3.1 The Agent-Environment Interface 3.2 Goals and Rewards 3.3 Returns 3.4 Unified Notation for Episodic and Continuing Tasks 3.5 The Markov Property 3.6 Markov Decision Processes 3.7 Value Functions 3.8 Optimal Value Functions 3.9 Optimality and Approximation 3.10 Summary 3.11 Bibliographical and Historical Remarks II. Elementary Solution Methods 4. Dynamic Programming 4.1 Policy Evaluation 4.2 Policy Improvement 4.3 Policy Iteration 4.4 Value Iteration 4.5 Asynchronous Dynamic Programming 4.6 Generalized Policy Iteration 4.7 Efficiency of Dynamic Programming 4.8 Summary 4.9 Bibliographical and Historical Remarks 5. Monte Carlo Methods 5.1 Monte Carlo Policy Evaluation 5.2 Monte Carlo Estimation of Action Values 5.3 Monte Carlo Control 5.4 On-Policy Monte Carlo Control 5.5 Evaluating One Policy While Following Another 5.6 Off-Policy Monte Carlo Control 5.7 Incremental Implementation 5.8 Summary 5.9 Bibliographical and Historical Remarks 6. Temporal-Difference Learning 6.1 TD Prediction 6.2 Advantages of TD Prediction Methods 6.3 Optimality of TD(0) 6.4 Sarsa: On-Policy TD Control 6.5 Q-Learning: Off-Policy TD Control 6.6 Actor-Critic Methods 6.7 R-Learning for Undiscounted Continuing Tasks 6.8 Games, Afterstates, and Other Special Cases 6.9 Summary 6.10 Bibliographical and Historical Remarks III. A Unified View 7. Eligibility Traces 7.1 -Step TD Prediction 7.2 The Forward View of TD( ) 7.3 The Backward View of TD( ) 7.4 Equivalence of Forward and Backward Views 7.5 Sarsa( ) 7.6 Q( ) 7.7 Eligibility Traces for Actor-Critic Methods 7.8 Replacing Traces 7.9 Implementation Issues 7.10 Variable 7.11 Conclusions 7.12 Bibliographical and Historical Remarks 8. Generalization and Function Approximation 8.1 Value Prediction with Function Approximation 8.2 Gradient-Descent Methods 8.3 Linear Methods 8.3.1 Coarse Coding 8.3.2 Tile Coding 8.3.3 Radial Basis Functions 8.3.4 Kanerva Coding 8.4 Control with Function Approximation 8.5 Off-Policy Bootstrapping 8.6 Should We Bootstrap? 8.7 Summary 8.8 Bibliographical and Historical Remarks 9. Planning and Learning 9.1 Models and Planning 9.2 Integrating Planning, Acting, and Learning 9.3 When the Model Is Wrong 9.4 Prioritized Sweeping 9.5 Full vs. Sample Backups 9.6 Trajectory Sampling 9.7 Heuristic Search 9.8 Summary 9.9 Bibliographical and Historical Remarks 10. Dimensions of Reinforcement Learning 10.1 The Unified View 10.2 Other Frontier Dimensions 11. Case Studies 11.1 TD-Gammon 11.2 Samuel's Checkers Player 11.3 The Acrobot 11.4 Elevator Dispatching 11.5 Dynamic Channel Allocation 11.6 Job-Shop Scheduling Bibliography Index
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