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stable-baselines3

Production-ready reinforcement learning algorithms (PPO, SAC, DQN, TD3, DDPG, A2C) with scikit-learn-like API. Use for standard RL experiments, quick prototyping, and well-documented algorithm implementations. Best for single-agent RL with Gymnasium environments. For high-performance parallel training, multi-agent systems, or custom vectorized environments, use pufferlib instead.

bundled/skills/stable-baselines3/SKILL.md

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# Stable Baselines3

## Routing Boundary

Use this skill only for Stable-Baselines3, SB3, PPO/SAC/DQN, reinforcement learning agents, Gymnasium environments, policies, rollouts, and RL training workflows. Do not use it for ordinary scikit-learn, random forests, supervised classification, tabular regression, or generic machine-learning model training.

## 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.

## Core Capabilities

### 1. Training RL Agents
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