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Hands-On Reinforcement Learning with Python

You're reading from   Hands-On Reinforcement Learning with Python Master reinforcement and deep reinforcement learning using OpenAI Gym and TensorFlow

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Product type Paperback
Published in Jun 2018
Publisher Packt
ISBN-13 9781788836524
Length 318 pages
Edition 1st Edition
Languages
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Author (1):
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Sudharsan Ravichandiran Sudharsan Ravichandiran
Author Profile Icon Sudharsan Ravichandiran
Sudharsan Ravichandiran
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Table of Contents (16) Chapters Close

Preface 1. Introduction to Reinforcement Learning 2. Getting Started with OpenAI and TensorFlow FREE CHAPTER 3. The Markov Decision Process and Dynamic Programming 4. Gaming with Monte Carlo Methods 5. Temporal Difference Learning 6. Multi-Armed Bandit Problem 7. Deep Learning Fundamentals 8. Atari Games with Deep Q Network 9. Playing Doom with a Deep Recurrent Q Network 10. The Asynchronous Advantage Actor Critic Network 11. Policy Gradients and Optimization 12. Capstone Project – Car Racing Using DQN 13. Recent Advancements and Next Steps 14. Assessments 15. Other Books You May Enjoy

DARQN

We have improved our DQN architecture by adding a recurrent layer, which captures temporal dependency, and we called it DRQN. Do you think we can improve our DRQN architecture further? Yes. We can further improve our DRQN architecture by adding the attention layer on top of the convolutional layer. So, what is the function of the attention layer? Attention implies the literal meaning of the word. Attention mechanisms are widely used in image captioning, object detection, and so on. Consider the task of neural networks captioning the image; to understand what is in the image, the network has to give attention to the specific object in the image for generating the caption.

Similarly, when we add the attention layer to our DRQN, we can select and pay attention to small regions of the image, and ultimately this reduces the number of parameters in the network and also reduces...

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