JEPADot Learn

Interactive chapters on the path to JEPA and LeWorldModel — Godot toys in the browser, short prose, empirical punchlines. Built to learn and to teach.

Start with Part I

Part I — Lineage

Why world models?A world model is a compact simulator of what happens next. JEPA-style models predict in latent space so planni…
Encoder: meaning as an addressAn encoder turns a messy observation into a short vector. That vector is not a caption — it is a location in a…
Reconstruction era (AE / VAE)Autoencoders force the latent to explain pixels. Capacity spent on texture is capacity not spent on “where is …
Predict pixelsNext-frame pixel models drown in appearance. Averaging futures looks vaguely right and still misses the contro…
Contrastive / SSLSelf-supervised learning can pull two views of one scene together without reconstructing pixels. That is close…
The JEPA pivotJoint-Embedding Predictive Architecture: encode now, predict later — in latent space. Skip pixel recon; regula…

Part II — Mechanisms

Part III — World model