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Deep Reinforcement Learning Hands-On. - Second Edition

You're reading from  Deep Reinforcement Learning Hands-On. - Second Edition

Product type Book
Published in Jan 2020
Publisher Packt
ISBN-13 9781838826994
Pages 826 pages
Edition 2nd Edition
Languages
Author (1):
Maxim Lapan Maxim Lapan
Profile icon Maxim Lapan

Table of Contents (28) Chapters

Preface 1. What Is Reinforcement Learning? 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. 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 model application

Okay, imagine that we have trained the model using the process just described. How should we use it to solve the scrambled cube? From the network's structure, you might imagine the obvious, but not very successful, way:

  1. Feed the model the current state of the cube that we want to solve
  2. From the policy head, get the largest action to perform (or sample it from the resulting distribution)
  3. Apply the action to the cube
  4. Repeat the process until the solved state has been reached

On paper, this method should work, but in practice, it has one serious issue: it doesn't! The main reason for that is our model's quality. Due to the size of the state space and the nature of the NNs, it just isn't possible to train an NN to return the exact optimal action for any input state all of the time. Rather than telling us what to do to get the solved state, our model shows us promising directions to explore. Those directions could bring...

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