Tag: dit

Porting ERNIE-Image-Turbo to Zig and Metal: An 8B Diffusion Transformer From Scratch on Apple Silicon

I rewrote the hot path of Baidu's 8B-parameter ERNIE-Image-Turbo (DiT + scheduler) from scratch in Zig with hand-written Metal kernels. 13.06s/step at 1024×1024 on M2 Max. The bug archaeology behind getting 36 layers numerically correct, plus the honest accounting of what still has Python in it.