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Deep Reinforcement Learning Hands-On

You're reading from Deep Reinforcement Learning Hands-On Apply modern RL methods, with deep Q-networks, value iteration, policy gradients, TRPO, AlphaGo Zero and more

Product type Paperback

Published in Jun 2018

Publisher Packt

ISBN-13 9781788834247

Length 546 pages

Edition 1st Edition

Languages

Python

Tools

Deep Reinforcement Learning

Concepts

Deep Reinforcement Learning

Author (1):

Maxim Lapan

View More author details

Table of Contents (21) Chapters

Preface

1. What is Reinforcement Learning? FREE CHAPTER

2. OpenAI Gym

3. Deep Learning with PyTorch

4. The Cross-Entropy Method

5. Tabular Learning and the Bellman Equation

6. Deep Q-Networks

7. DQN Extensions

8. Stocks Trading Using RL

9. Policy Gradients – An Alternative

10. The Actor-Critic Method

11. Asynchronous Advantage Actor-Critic

12. Chatbots Training with RL

13. Web Navigation

14. Continuous Action Space

15. Trust Regions – TRPO, PPO, and ACKTR

16. Black-Box Optimization in RL

17. Beyond Model-Free – Imagination

18. AlphaGo Zero

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Index

Value of action

To make our life slightly easier, we can define different quantities in addition to the value of state Value of action : value of action . Basically, it equals the total reward we can get by executing action a in state s and can be defined via . Being a much less fundamental entity than , this quantity gave a name to the whole family of methods called "Q-learning", because it is slightly more convenient in practice. In these methods, our primary objective is to get values of Q for every pair of state and action.

Value of action

Q for this state s and action a equals the expected immediate reward and the discounted long-term reward of the destination state. We also can define Value of action via :

Value of action

This just means that the value of some state equals to the value of the maximum action we can execute from this state. It may look very close to the value of state, but there is still a difference, which is important to understand. Finally, we can express Q(s, a) via itself, which will be used in the...

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Authors (1)

Maxim Lapan

Maxim Lapan

Maxim has been working as a software developer for more than 20 years and was involved in various areas: distributed scientific computing, distributed systems and big data processing. Since 2014 he is actively using machine and deep learning to solve practical industrial tasks, such as NLP problems, RL for web crawling and web pages analysis. He has been living in Germany with his family.

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