Series
Psi0 Hands On
The "Psi0 Hands On" series has 6 parts — read them in order from part 1.
Whole-body VLA
Ψ₀ Hands-On (1): Overview & Key Ideas
Introducing Ψ₀ — the first open-source foundation model that teaches humanoid robots to walk and manipulate objects simultaneously.

Ψ₀ Hands-On (2): The Three-Tier Architecture
Deep-dive into the Ψ₀ architecture: System-2 (VLM), System-1 (MM-DiT), System-0 (RL Controller) — the brain, hands, and legs of the robot.

Psi0 Hands-On (3): Data Recipe & Pipeline
Explore Psi0's data recipe — why 860h of data beats 10,000h, how to process EgoDex, Humanoid Everyday, and LeRobot format.

Psi0 Hands-On (4): Setup & Training Pipeline
Step-by-step guide to setting up the Psi0 environment and running the 3-stage training pipeline: pre-train, post-train, fine-tune.

Psi0 Hands-On (5): Inference & Evaluation
Guide to deploying the Psi0 model, running inference in the SIMPLE simulator, and evaluating results with Real-Time Chunking.

Psi0 Hands-On (6): Ablation Studies & Key Takeaways
Analyzing ablation studies, comparing baselines, and the 5 most important lessons from Psi0 for newcomers.