Dear All,

We have spotted an issue in the baseline algorithm causing trouble on the final leaderboards. In particular, the following code lines are the cause of the problem:

if ratio > 50.: wsi_patch_indexes = skimage.morphology.remove_small_objects(((wsi_patch == bulk_class)), min_size=mm2_to_px(0.005, spacing), connectivity=2) wsi_patch[wsi_patch_indexes==False] = 0 kernel_diameter = dist_to_px(1000, spacing) min_size_px = mm2_to_px(min_size, spacing)

If you have based your algorithm on the baseline algorithm and have not changed this part, please contact us.

Witali Aswolinskiy witali.aswolinskiy@radboudumc.nl

Mart van Rijthoven mart.vanrijthoven@radboudumc.nl

Francesco Ciompi francesco.ciompi@radboudumc.nl

Please put us all in cc.

Best wishes, Tiger