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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
Languages
Concepts
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Author (1):
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Maxim Lapan Maxim Lapan
Author Profile Icon Maxim Lapan
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 TextWorld Environment

In the previous chapter, you saw how reinforcement learning (RL) methods can be applied to natural language processing (NLP) problems, in particular, to improve the chatbot training process. Continuing our journey into the NLP domain, in this chapter, we will now use RL to solve text-based interactive fiction games, using the environment published by Microsoft Research called TextWorld.

In this chapter, we will:

  • Cover a brief historical overview of interactive fiction
  • Study the TextWorld environment
  • Implement the simple baseline deep Q-network (DQN) method, and then try to improve it by implementing a command generator using recurrent neural networks (RNNs). This will provide a good illustration of how RL can be applied to complicated environments with a rich observation space
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