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medotter batch 10 ops (FF-C section 1): add an image_id column (the file stem) to the COph100 shard
Verified signatureThe MedOtter loader reads a row's identity off the image_id column and, with it absent, falls back to the row's position in its hub split, while local mode names the same sample by its .jpg stem -- so the two modes could not be aligned row for row. image_id holds the value the mirror's own filename column already carries: the file stem, which is also what each row's mask.path (<stem>_mask.png) is built from. Additive only. The eight existing columns keep their names, types, order and values; row order is unchanged; row groups, per-column compression, dictionary encoding and the datasets feature metadata are reproduced from the original shard.254cd3b
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