Next-Gen AI: Deep Reinforcement Learning in PyTorch IV

This course contains the use of artificial intelligence (it's an AI course, duh!).

Welcome to the next generation of Deep Reinforcement Learning.

This course picks up where the previous series left off and dives into the modern algorithms that define today’s state of the art: Soft Actor-Critic (SAC), Trust Region Policy Optimization (TRPO), and Proximal Policy Optimization (PPO).

These are the methods used in cutting-edge research and real-world applications where stability, efficiency, and performance matter.

Why This Course?

Deep RL has evolved rapidly. Algorithms like DQN, DDPG, and TD3 laid the groundwork, but modern practitioners rely on entropy-regularized methods and trust-region optimization to achieve stable learning in complex environments.

This course brings you up to speed with:

• Soft Actor-Critic (SAC): Entropy-regularized RL for stable and highly efficient learning.

• TRPO Foundations: The theoretical backbone of modern policy optimization.

• Proximal Policy Optimization (PPO): The industry-standard algorithm used across research and production.

• Atari Environments: Train agents on high-dimensional visual inputs.

• Multi-Period Portfolio Optimization: A real-world VIP project using modern RL.

What You’ll Master

This course bridges theory and implementation. A Lazy Programmer course is never just about using libraries. You’ll build each algorithm step-by-step in PyTorch and understand exactly why they work.

1. Reinforcement Learning Foundations Review

We begin with a concise but thorough refresher of the core ideas that power all reinforcement learning algorithms. You’ll revisit Markov Decision Processes (MDPs), Dynamic Programming (DP), Monte Carlo (MC) methods, and Temporal Difference (TD) learning, along with Q-learning and function approximation. This section ensures you understand how value functions are estimated, how policies improve over time, and how deep learning integrates into RL. We also include a review of Deep Q Networks (DQN) to bridge the gap between value-based methods and the advanced policy-gradient algorithms that follow.

2. Soft Actor-Critic (SAC)

Next, we dive into Soft Actor-Critic, one of the most powerful and stable algorithms in modern deep reinforcement learning. We begin with a brief review of DDPG and TD3 to motivate why SAC was developed, then introduce entropy-regularized reinforcement learning and the concept of maximizing both reward and randomness. You’ll learn how to compute the soft actor and soft critic objectives, how stochastic policies require a change-of-variables correction, and how SAC automatically balances exploration and exploitation.

3. Trust Region Policy Optimization (TRPO)

Before implementing PPO, we carefully develop the theoretical foundation that inspired it: Trust Region Policy Optimization. You’ll learn why naive policy gradient methods can become unstable, and how constraining policy updates using KL divergence leads to more reliable learning. This section explains the trust-region idea, how surrogate objectives are constructed, and why TRPO provides monotonic policy improvement. Even though TRPO is more complex to implement, understanding its derivation gives you deep insight into modern policy optimization methods.

This gives you the theoretical insight most courses skip.

4. Proximal Policy Optimization (PPO)

With TRPO as the foundation, we move on to Proximal Policy Optimization, the algorithm that has become the industry standard for deep reinforcement learning. You’ll see how PPO approximates TRPO while remaining simple enough for practical implementation. We derive the clipped surrogate objective, introduce Generalized Advantage Estimation (GAE) for reducing variance, and show how KL divergence can be used for early stopping. The algorithm is implemented from scratch and tested in both discrete and continuous control environments.

5. Atari Deep Reinforcement Learning

After mastering continuous and low-dimensional environments, we move to Atari games, where agents must learn directly from high-dimensional visual input. You’ll build convolutional neural network policies, implement frame stacking and preprocessing, and learn the practical techniques needed to stabilize training in complex environments. This section demonstrates how modern policy-gradient algorithms scale to challenging problems and provides experience working with the same types of benchmarks used in deep RL research.

6. The VIP Project: Multi-Period Portfolio Optimization

Finally, you’ll apply everything you’ve learned to a real-world finance project: multi-period portfolio optimization. Traditional portfolio theory requires predicting expected returns and asset correlations and typically focuses on single-period decisions. In contrast, you’ll build a reinforcement learning agent that learns directly from historical data and dynamically adjusts allocations over time. The agent optimizes long-term performance, balances risk and return, and adapts to changing market conditions. This project demonstrates how deep reinforcement learning can overcome the limitations of classical portfolio methods and provides a practical end-to-end application of modern RL algorithms.

Is This Course For You?

If you are a programmer, data scientist, or AI enthusiast who wants to master the most important modern Deep Reinforcement Learning algorithms, this course is for you.

This course goes beyond “plug-and-play” libraries. You will build everything in PyTorch, understand the math, and gain the intuition needed to design your own RL agents.

If you want to understand SAC, PPO, and TRPO at a deep level (and apply them to real-world problems) this course is your roadmap.

Are you ready to build the next generation of intelligent agents?

Suggested prerequisites:

• calculus

• probability and statistics

• Python coding: if/else, loops, lists, dicts, sets

• Numpy coding: matrix and vector operations, loading CSV files

• Neural networks and backpropagation

• Can write a feedforward neural network in PyTorch

• Can write a convolutional neural network in PyTorch

• Markov Decision Processes (MDPs)

• Temporal Difference learning

• Basic familiarity with Deep Reinforcement Learning