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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

Collaboration by the tigers

The second experiment that I implemented was designed to make the tigers' lives more complicated and encourage collaboration between them. The training and play code are the same; the only difference is in the MAgent environment's configuration. I took the double_attack configuration file from MAgent (https://github.com/geek-ai/MAgent/blob/master/python/magent/builtin/config/double_attack.py) and tweaked it to add the reward of 0.1 after every step for both tigers and deer. The following is the modified function config_double_attack() from Chapter25/lib/data.py:

def config_double_attack(map_size):
    gw = magent.gridworld
    cfg = gw.Config()
    cfg.set({"map_width": map_size, "map_height": map_size})
    cfg.set({"embedding_size": 10})

We create the configuration object and set the map dimensions. The embedding size is the dimensionality of the minimap, which is not enabled in this configuration...

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