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Deep Reinforcement Learning Hands-On

Deep Reinforcement Learning Hands-On

By : Maxim Lapan
4.3 (34)
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Deep Reinforcement Learning Hands-On

Deep Reinforcement Learning Hands-On

4.3 (34)
By: Maxim Lapan

Overview of this book

Deep Reinforcement Learning Hands-On is a comprehensive guide to the very latest DL tools and their limitations. You will evaluate methods including Cross-entropy and policy gradients, before applying them to real-world environments. Take on both the Atari set of virtual games and family favorites such as Connect4. The book provides an introduction to the basics of RL, giving you the know-how to code intelligent learning agents to take on a formidable array of practical tasks. Discover how to implement Q-learning on 'grid world' environments, teach your agent to buy and trade stocks, and find out how natural language models are driving the boom in chatbots.
Table of Contents (21 chapters)
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20
Index

Custom layers

In the previous section, we briefly mentioned the nn.Module class as a base parent for all NN building blocks exposed by PyTorch. It's not only a unifying parent for the existing layers—it's much more than that. By subclassing the nn.Module class, you can create your own building blocks which can be stacked together, reused later, and integrated into the PyTorch framework flawlessly.

At its core, nn.Module provides quite rich functionality to its children:

  • It tracks all submodules that the current module includes. For example, your building block can have two feed-forward layers used somehow to perform the block's transformation.
  • It provides functions to deal with all parameters of the registered submodules. You can obtain a full list of the module's parameters (parameters() method), zero its gradients (zero_grads() method), move to CPU or GPU (to(device) method), serialize and deserialize the module (state_dict() and load_state_dict()), and even...

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