Machine Heart

Jul 7, 2026 · Artificial Intelligence

Is Your World Model Too Slow? Fast‑LeWM Boosts Dynamic Prediction by 4× with Action‑Prefix Parallelism

Fast‑LeWM replaces the step‑by‑step rollout of traditional world models with trajectory‑level parallel prediction using an action‑prefix encoder, raising planning success from 85.8% to 90.5% (92% with self‑consistency) and cutting dynamics time from 31.4 s to 8.0 s, a four‑fold speedup.