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U-Cast reproduction bundle

Reproduction of U-Cast: A Surprisingly Simple and Efficient Frontier Probabilistic AI Weather Forecaster (ICML 2026, OpenReview XF0wkyEbuM). Logbook: https://huggingface.co/spaces/ancs21/repro-ucast · Paper code: https://github.com/Rose-STL-Lab/u-cast · Weights: https://huggingface.co/salv47/u-cast

  • ucast_params.py — Modal job: loads the released ucast.ckpt and counts params (~895M model + EMA copy). Verified.
  • ucast_params.json — raw output. Claims verified: (1) architecture is a stock DhariwalUNet (ADM/EDM diffusion UNet) -> "surprisingly simple"; (2) ~895M params. Performance (ERA5 RMSE/CRPS) not attempted (heavy, but public/reproducible).