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stable-baselines3
Trains and evaluates single-agent reinforcement learning with Stable Baselines3 (PPO, SAC, DQN, TD3, DDPG, A2C), Gymnasium custom environments, vectorized rollouts, callbacks, and checkpoint normalization. Applies to reproducible RL experiments, continuous control, discrete actions, and SB3-Contrib recurrent or masked policies.
skills/stable-baselines3/SKILL.md
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# Stable Baselines3
## Overview
Stable Baselines3 (SB3) is a PyTorch-based library providing reliable implementations of reinforcement learning algorithms. This skill provides comprehensive guidance for training RL agents, creating custom environments, implementing callbacks, and optimizing training workflows using SB3's unified API.
**Current upstream:** SB3 **2.9.0** (June 15, 2026). Docs: [stable-baselines3.readthedocs.io](https://stable-baselines3.readthedocs.io/en/v2.9.0/).
## Installation
Tested against **stable-baselines3 2.9.0**. Requires **Python 3.10+** (3.9 dropped in 2.8.0) and **PyTorch >= 2.8**.
```bash
# Basic installation