Book Image

The Reinforcement Learning Workshop

By : Alessandro Palmas, Emanuele Ghelfi, Dr. Alexandra Galina Petre, Mayur Kulkarni, Anand N.S., Quan Nguyen, Aritra Sen, Anthony So, Saikat Basak
Book Image

The Reinforcement Learning Workshop

By: Alessandro Palmas, Emanuele Ghelfi, Dr. Alexandra Galina Petre, Mayur Kulkarni, Anand N.S., Quan Nguyen, Aritra Sen, Anthony So, Saikat Basak

Overview of this book

Various intelligent applications such as video games, inventory management software, warehouse robots, and translation tools use reinforcement learning (RL) to make decisions and perform actions that maximize the probability of the desired outcome. This book will help you to get to grips with the techniques and the algorithms for implementing RL in your machine learning models. Starting with an introduction to RL, youÔÇÖll be guided through different RL environments and frameworks. YouÔÇÖll learn how to implement your own custom environments and use OpenAI baselines to run RL algorithms. Once youÔÇÖve explored classic RL techniques such as Dynamic Programming, Monte Carlo, and TD Learning, youÔÇÖll understand when to apply the different deep learning methods in RL and advance to deep Q-learning. The book will even help you understand the different stages of machine-based problem-solving by using DARQN on a popular video game Breakout. Finally, youÔÇÖll find out when to use a policy-based method to tackle an RL problem. By the end of The Reinforcement Learning Workshop, youÔÇÖll be equipped with the knowledge and skills needed to solve challenging problems using reinforcement learning.
Table of Contents (14 chapters)
Preface
Free Chapter
2
2. Markov Decision Processes and Bellman Equations

4. Getting started with OpenAI and TensorFlow for Reinforcement Learning

Activity 4.01: Training a Reinforcement Learning Agent to Play a Classic Video Game

  1. Import all the required modules from OpenAI Baselines and TensorFlow in order to use the PPO algorithm:
    from baselines.ppo2.ppo2 import learn
    from baselines.ppo2 import defaults
    from baselines.common.vec_env import VecEnv, VecFrameStack
    from baselines.common.cmd_util import make_vec_env, make_env
    from baselines.common.models import register
    import tensorflow as tf
  2. Define and register a custom convolutional neural network for the policy network:
    @register("custom_cnn")
    def custom_cnn():
        def network_fn(input_shape, **conv_kwargs):
            """
            Custom CNN
            """
            print('input shape...