JeongsLee MOTION GitHub: https://github.com/JeongsLee/MOTION Docs: https://github.com/JeongsLee/MOTION/blob/main/WEIGHTS.md Developer: Jeongsu Lee, Kyung Hee University Released: August 2026 Variants: MOTION, MOTION-S, 6-family joint-benchmark model, Poseidon-corpus IVP pretrain, six few-shot fine-tuned arms Parameters: MOTION: 156.9M / MOTION-S: 20.7M / joint-benchmark: 114M / IVP pretrain and fine-tuned: 161.9M Architecture: Per-step tendency as a gated sum of explicit physical-mechanism heads (transport, diffusion, pressure and density coupling, reaction, wave, curvature) plus an ungated state head; mechanism knockout and physical-equivalence tests; TensorFlow License: Code: MIT / weights: CC-BY-4.0 Modalities: 2D and 3D PDE fields in, 2D and 3D PDE fields out; nineteen equation families across nine governing systems Runs on: Inference from a released checkpoint: 1 GPU with 24GB or more, Linux Formats: TensorFlow 2.15 named-array .npz in tar archives On disk: MOTION: 580MB / MOTION-S: 152MB / joint-benchmark: 456MB / IVP pretrain: 648MB / IVP fine-tuned: 3.89GB tar