ink9um-dense-labels

Dense pseudo-labels for the 9 um ink corpus

288.7 M supervised pixels across 7 aligned segments, against 5.8 M in the manual labels those segments ship with. Same layout and same zarr parameters as scrollprize ink_9um/labels, so it drops into a training config by changing one path.

Download and unpack:

huggingface-cli download domenicor046/ink9um-dense-labels \
  ink9um-dense-pseudolabels.tar --local-dir .
tar -xf ink9um-dense-pseudolabels.tar

That gives pseudo_labels/aligned-scrollprizeorg-21slices/<segment>/ holding <segment>_inklabels.zarr, <segment>_supervision_mask.zarr, and <segment>_validation_mask.zarr where one exists.

How the labels were made

The canonical 2.4 um ink model is run on each segment's public 2.4 um surface volume and pooled to the exact 9.6 um raster the 9 um model trains on, then thresholded per segment at a value calibrated only on that segment's manual supervision region. Manual labels win wherever manual supervision exists.

• inklabels = manual label inside manual supervision, else teacher >= t*
• supervision_mask = render-valid AND NOT validation_mask
• content on the middle slice only, which is the only label slice training reads
• values 0/255 uint8

Per-segment thresholds: w016 0.15, w017 0.33, w028 0.27, w029 0.25, 0814 0.53, 1667-w028 0.45, 1667-w029 0.36.

Important caveats

The three held-out validation regions are excluded from supervision_mask by construction, verified as exactly zero overlapping pixels per segment. Keep the validation_mask.zarr files in place if you train on this: without them the trainer silently produces no validation metric and no best checkpoint, and still exits 0.

w016's labels are the weakest of the seven. Its threshold of 0.15 was the most permissive and marks 28 percent of its canvas as ink. A model trained on all seven renders w016's held-out letters as merged blobs, while excluding w016 brings them back. If you use this dataset, consider dropping w016 or recalibrating it.

These are model-derived labels, not human annotation. They are noisier than the manual labels, which is part of why the training recipe's bce_label_smoothing of 0.5 is load-bearing.

Provenance and licence

The scripts and documentation are MIT. The labels are derived from Vesuvius Challenge data and models (scrollprize/ink_9um, scrollprize/ink_canonical_2um, and the open-data S3 bucket) and remain subject to the terms of those sources.

Full results, figures, and the code that built this: https://github.com/DomRusso2/ink9um-dense