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Deep Reinforcement Learning Hands-On

You're reading from   Deep Reinforcement Learning Hands-On Apply modern RL methods to practical problems of chatbots, robotics, discrete optimization, web automation, and more

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Product type Paperback
Published in Jan 2020
Publisher Packt
ISBN-13 9781838826994
Length 826 pages
Edition 2nd Edition
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Author (1):
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Maxim Lapan Maxim Lapan
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Maxim Lapan
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Table of Contents (28) Chapters Close

Preface 1. What Is Reinforcement Learning? 2. OpenAI Gym FREE CHAPTER 3. Deep Learning with PyTorch 4. The Cross-Entropy Method 5. Tabular Learning and the Bellman Equation 6. Deep Q-Networks 7. Higher-Level RL Libraries 8. DQN Extensions 9. Ways to Speed up RL 10. Stocks Trading Using RL 11. Policy Gradients – an Alternative 12. The Actor-Critic Method 13. Asynchronous Advantage Actor-Critic 14. Training Chatbots with RL 15. The TextWorld Environment 16. Web Navigation 17. Continuous Action Space 18. RL in Robotics 19. Trust Regions – PPO, TRPO, ACKTR, and SAC 20. Black-Box Optimization in RL 21. Advanced Exploration 22. Beyond Model-Free – Imagination 23. AlphaGo Zero 24. RL in Discrete Optimization 25. Multi-agent RL 26. Other Books You May Enjoy
27. Index

The command generation model

In this part of the chapter, we will extend our baseline model with an extra submodule that will generate commands that our DQN network should evaluate. In the baseline model, commands were taken from the admissible commands list, which was taken from the extended information from the environment. But maybe we can generate commands from the observation using the same techniques that we covered in the previous chapter.

The architecture of our new model is shown in Figure 15.12.

Figure 15.12: The architecture of the DQN with command generation

In comparison with Figure 15.3 from earlier in the chapter, there are several changes here. First of all, our preprocessor pipeline no longer accepts a command sequence in the input. The second difference is that the preprocessor's output now not only gets passed to the DQN model, but it also forks to the "Commands generator" submodule.

The responsibility of this new submodule is to produce...

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