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You're reading from  PyTorch 1.x Reinforcement Learning Cookbook

Product typeBook
Published inOct 2019
Reading LevelIntermediate
PublisherPackt
ISBN-139781838551964
Edition1st Edition
Languages
Python
Tools
PyTorch
Concepts
Reinforcement Learning
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Author (1)
Yuxi (Hayden) Liu
Yuxi (Hayden) Liu
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Yuxi (Hayden) Liu

Yuxi (Hayden) Liu was a Machine Learning Software Engineer at Google. With a wealth of experience from his tenure as a machine learning scientist, he has applied his expertise across data-driven domains and applied his ML expertise in computational advertising, cybersecurity, and information retrieval. He is the author of a series of influential machine learning books and an education enthusiast. His debut book, also the first edition of Python Machine Learning by Example, ranked the #1 bestseller in Amazon and has been translated into many different languages.
Read more about Yuxi (Hayden) Liu

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Solving Cliff Walking with the actor-critic algorithm

In this recipe, let's solve a more complicated Cliff Walking environment using the A2C algorithm.

Cliff Walking is a typical Gym environment with long episodes without a guarantee of termination. It is a grid problem with a 4 * 12 board. An agent makes a move of up, right, down and left at a step. The bottom-left tile is the starting point for the agent, and the bottom-right is the winning point where an episode will end if it is reached. The remaining tiles in the last row are cliffs where the agent will be reset to the starting position after stepping on any of them, but the episode continues. Each step the agent takes incurs a -1 reward, with the exception of stepping on the cliffs, where a -100 reward incurs.

The state is an integer from 0 to 47, indicating where the agent is located, as illustrated:

Such value does...

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PyTorch 1.x Reinforcement Learning Cookbook
Published in: Oct 2019Publisher: PacktISBN-13: 9781838551964
© 2019 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Yuxi (Hayden) Liu

Yuxi (Hayden) Liu was a Machine Learning Software Engineer at Google. With a wealth of experience from his tenure as a machine learning scientist, he has applied his expertise across data-driven domains and applied his ML expertise in computational advertising, cybersecurity, and information retrieval. He is the author of a series of influential machine learning books and an education enthusiast. His debut book, also the first edition of Python Machine Learning by Example, ranked the #1 bestseller in Amazon and has been translated into many different languages.
Read more about Yuxi (Hayden) Liu

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