- Download the file 'Darcy_421.zip' in [paper](https://arxiv.org/pdf/2010.08895.pdf).
- Unzip the file 'piececonst_r421_N1024_smooth1.mat' and 'piececonst_r421_N1024_smooth2.mat' in dir '.../SKNO_NeurIPS/2D_Darcy/data'