How to load multiple classes of RLE-strings from CSV? Severstal Steel Competition

fastai
11

@Florobax are you able to explain this block of code for me please:

for k, rle in enumerate(rles):
if isinstance(rle, str):
mask = open_mask_rle(rle, shape).px.permute(0, 2, 1)
final_mask += (k+1)*mask

Thank you