Interactive · Euler vs Heun ODE Solver

Same velocity field as above: data at ±μ, noise 𝒩(0,1), marginal velocity in closed form. Both solvers integrate dx/dt = v(x,t) backward from t=1 (noise) to t=0 (data). Euler uses one velocity evaluation per step (= DDIM). Heun uses two evaluations with predict–correct (= DPM-Solver-2). Use Step ▶ to watch each method work, one step at a time.