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Mastering Reinforcement Learning with Python

You're reading from  Mastering Reinforcement Learning with Python

Product type Book
Published in Dec 2020
Publisher Packt
ISBN-13 9781838644147
Pages 544 pages
Edition 1st Edition
Languages
Author (1):
Enes Bilgin Enes Bilgin
Profile icon Enes Bilgin

Table of Contents (24) Chapters

Preface 1. Section 1: Reinforcement Learning Foundations
2. Chapter 1: Introduction to Reinforcement Learning 3. Chapter 2: Multi-Armed Bandits 4. Chapter 3: Contextual Bandits 5. Chapter 4: Makings of a Markov Decision Process 6. Chapter 5: Solving the Reinforcement Learning Problem 7. Section 2: Deep Reinforcement Learning
8. Chapter 6: Deep Q-Learning at Scale 9. Chapter 7: Policy-Based Methods 10. Chapter 8: Model-Based Methods 11. Chapter 9: Multi-Agent Reinforcement Learning 12. Section 3: Advanced Topics in RL
13. Chapter 10: Introducing Machine Teaching 14. Chapter 11: Achieving Generalization and Overcoming Partial Observability 15. Chapter 12: Meta-Reinforcement Learning 16. Chapter 13: Exploring Advanced Topics 17. Section 4: Applications of RL
18. Chapter 14: Solving Robot Learning 19. Chapter 15: Supply Chain Management 20. Chapter 16: Personalization, Marketing, and Finance 21. Chapter 17: Smart City and Cybersecurity 22. Chapter 18: Challenges and Future Directions in Reinforcement Learning 23. Other Books You May Enjoy

Deep Q-networks

DQN is a seminal work by (Mnih et al., 2015) that made deep RL a viable approach to complex sequential control problems. The authors demonstrated that a single DQN architecture can achieve super-human level performance in many Atari games without any feature engineering, which created a lot of excitement regarding the progress of AI. Let's look into what makes DQN so effective compared to the algorithms we mentioned earlier.

Key concepts in deep Q-networks

DQN modifies online Q-learning with two important concepts by using experience replay and a target network, which greatly stabilize the learning. We describe these concepts next.

Experience replay

As mentioned earlier, simply using the experience sampled sequentially from the environment leads to highly correlated gradient steps. DQN, on the other hand, stores those experience tuples, , in a replay buffer (memory), an idea that was introduced back in 1993 (Lin, 1993). During learning, the samples...

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