jma02/ert-pca-may22-full

Final model — May-22 PCA–U-Net predictions

final_model_unet.zip contains predictions for all 2,000 full-domain May-22 test samples, with no added measurement noise.

Unzip and open the extracted folder in MATLAB. Each sample file contains its coordinates and predictions; no separate grid file is needed.

P = load('test_sample142.mat');
plot_prediction_points('test_sample142.mat');
plot_prediction_volume('test_sample142.mat');

The plots hide air by default. Pass false as the second argument to show the whole grid. Only base MATLAB is needed.

Contents

• P.points: 131072-by-3 coordinates [x,y,z], in metres.
• P.values: 131072-by-1 predicted conductivity, in S/m, matched row for row with P.points.
• P.prediction: 64-by-32-by-64 conductivity array, indexed (z,y,x).
• P.solid_mask: the same shape as P.prediction; true at or below the peat surface.
• P.xq, P.yq, P.zq: grid axes. Coordinates increase along each axis; z increases upward.

The point order matches xyz_points from extract_xyz_grid: y varies fastest, then x, then z. The 3D array matches uniform_sigma_grid. No reordering is needed when that code uses the same grid settings.

Dataset and domain

These predictions use the May-22, 2026 COMSOL test set. The prediction network was trained from random initialization with L2 + Dice + Chamfer losses from the beginning, keeping the existing 64-mode PCA decoder fixed. There is no separate fine-tuning stage. Training used Muon with AdamW for the remaining parameters; validation selected epoch 117 of 120. The checkpoint is saved_runs/pca_boundary_from_start_20261103/muon120/best.pt; P.model_run identifies the run.

Samples 1–1000 have one inclusion; samples 1001–2000 have two. Filenames match the original MATLAB sample numbers. The two-inclusion samples were not used for training or validation.

The full regular prediction grid has 64 x-points in [-15,15], 32 y-points in [-7.5,7.5], and 64 z-points in approximately [-10,2.2510135] metres. Use the saved axes for exact coordinates. These are regular-grid values, not values on the original COMSOL mesh nodes.

The training offset of 1e-6 S/m is included in the predicted conductivity. No ground truth, voltages, or model weights are included. The files use MATLAB v5 format. Array correspondence was checked in SciPy; the plotting scripts have not been run in MATLAB here.