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Hello and welcome to our course; Reinforcement Learning.

Reinforcement Learning is a very exciting and important field of Machine Learning and AI. Some call it the crown jewel of AI.

In this course, we will cover all the aspects related to Reinforcement Learning or RL. We will start by defining the RL problem, and compare it to the Supervised Learning problem, and discover the areas of applications where RL can excel. This includes the problem formulation, starting from the very basics to the advanced usage of Deep Learning, leading to the era of Deep Reinforcement Learning.

In our journey, we will cover, as usual, both the theoretical and practical aspects, where we will learn how to implement the RL algorithms and apply them to the famous problems using libraries like OpenAI Gym, Keras-RL, TensorFlow Agents or TF-Agents and Stable Baselines.

The course is divided into 6 main sections:

1- We start with an introduction to the RL problem definition, mainly comparing it to the Supervised learning problem, and discovering the application domains and the main constituents of an RL problem. We describe here the famous OpenAI Gym environments, which will be our playground when it comes to practical implementation of the algorithms that we learn about.

2- In the second part we discuss the main formulation of an RL problem as a Markov Decision Process or MDP, with simple solution to the most basic problems using Dynamic Programming.

3- After being armed with an understanding of MDP, we move on to explore the solution space of the MDP problem, and what the different solutions beyond DP, which includes model-based and model-free solutions. We will focus in this part on model-free solutions, and defer model-based solutions to the last part. In this part, we describe the Monte-Carlo and Temporal-Difference sampling based methods, including the famous and important Q-learning algorithm, and SARSA. We will describe the practical usage and implementation of Q-learning and SARSA on control tabular maze problems from OpenAI Gym environments.

4- To move beyond simple tabular problems, we will need to learn about function approximation in RL, which leads to the mainstream RL methods today using Deep Learning, or Deep Reinforcement Learning (DRL). We will describe here the breakthrough algorithm of DeepMind that solved the Atari games and AlphaGO, which is Deep Q-Networks or DQN. We also discuss how we can solve Atari games problems using DQN in practice using Keras-RL and TF-Agents.

5- In the fifth part, we move to Advanced DRL algorithms, mainly under a family called Policy based methods. We discuss here Policy Gradients, DDPG, Actor-Critic, A2C, A3C, TRPO and PPO methods. We also discuss the important Stable Baseline library to implement all those algorithms on different environments in OpenAI Gym, like Atari and others.

6- Finally, we explore the model-based family of RL methods, and importantly, differentiating model-based RL from planning, and exploring the whole spectrum of RL methods.

Hopefully, you enjoy this course, and find it useful.