Introduction to Reinforcement Learning
Chapter 1: Foundations of Reinforcement Learning
What is Reinforcement Learning?
Agents and Environments
States, Actions, and Rewards
Policies: Mapping States to Actions
The RL Workflow: Interaction Loops
Types of RL Tasks: Episodic vs Continuing
Comparing RL with Other Learning Types
Setting up Your Python Environment for RL
Quiz for Chapter 1
Chapter 2: Markov Decision Processes (MDPs)
Modeling Sequential Decision Making
Formal Definition of an MDP
State Transition Probabilities
Reward Functions
Return: Cumulative Future Rewards
Discounting Future Rewards
Policies and Value Functions (Vπ, Qπ)
Finding Optimal Policies
Quiz for Chapter 2
Chapter 3: Estimating Value Functions
The Bellman Expectation Equation
The Bellman Optimality Equation
Solving Bellman Equations (Overview)
Dynamic Programming: Policy Iteration
Dynamic Programming: Value Iteration
Limitations of Dynamic Programming
Quiz for Chapter 3
Chapter 4: Monte Carlo Methods
Learning from Complete Episodes
Monte Carlo Prediction: Estimating Vπ
Monte Carlo Control: Estimating Qπ
On-Policy vs Off-Policy Learning
MC Control without Exploring Starts
On-Policy First-Visit MC Control Implementation
Off-Policy MC Prediction and Control Intro
Practice: Implementing MC Prediction
Quiz for Chapter 4
Chapter 5: Temporal-Difference Learning
Learning from Incomplete Episodes
TD(0) Prediction: Estimating Vπ
Advantages of TD Learning over MC
SARSA: On-Policy TD Control
Q-Learning: Off-Policy TD Control
Comparing SARSA and Q-Learning
Expected SARSA
Hands-on Practical: Implementing Q-Learning
Quiz for Chapter 5
Chapter 6: Function Approximation in RL
Handling Large State Spaces
Value Function Approximation (VFA)
Feature Vectors for State Representation
Linear Methods for VFA
Gradient Descent for Parameter Learning
Semi-gradient TD Methods
Using Neural Networks for VFA
Practice: Applying Linear VFA
Quiz for Chapter 6
Chapter 7: Introduction to Deep Q-Networks (DQN)
Combining Q-Learning with Deep Learning
Challenges with Neural Networks in RL
Experience Replay Mechanism
Fixed Q-Targets (Target Networks)
The DQN Algorithm Structure
Architectural Considerations for DQNs
Hands-on Practical: Building a Basic DQN
Quiz for Chapter 7
Chapter 8: Introduction to Policy Gradient Methods
Learning Policies Directly
Policy Gradient Theorem (Concept)
REINFORCE Algorithm
Baselines for Variance Reduction
Actor-Critic Methods Overview
Comparing Value-Based and Policy-Based Methods
Practice: Implementing REINFORCE
Quiz for Chapter 8
Experience Replay Mechanism
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- Human-level control through deep reinforcement learning, Volodymyr Mnih, Koray Kavukcuoglu, David Silver, Andrei A. Rusu, Joel Veness, Marc G. Bellemare, Alex Graves, Martin Riedmiller, Andreas K. Fidjeland, Georg Ostrovski, Stig Petersen, Charles Beattie, Amir Sadik, Ioannis Antonoglou, Helen King, Dharshan Kumaran, Daan Wierstra, Shane Legg, and Demis Hassabis, 2015 Nature, Vol. 518 DOI: 10.1038/nature14236 - This original paper introduced Deep Q-Networks (DQN) and details the experience replay mechanism and its role in stabilizing training.
- Prioritized Experience Replay, Tom Schaul, John Quan, Ioannis Antonoglou, and David Silver, 2016 International Conference on Learning Representations (ICLR) DOI: 10.48550/arXiv.1511.05952 - This paper presents Prioritized Experience Replay, an advanced sampling strategy that improves upon uniform sampling by prioritizing experiences with higher temporal difference errors.
- Reinforcement Learning: An Introduction, Richard S. Sutton and Andrew G. Barto, 2018 (MIT Press) - A standard textbook on reinforcement learning, providing a detailed explanation of Q-learning, Deep Q-Networks, and the challenges they address, including the necessity of experience replay.