what is sparse annotation? Is it pixel-wise labeling for images. what are the other types of annotation?
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$\begingroup$ not every pixel is labeled $\endgroup$ – shimao Jun 16 '19 at 18:56
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$\begingroup$ so there are some unlabeled pixels that are considered as "don't care"? $\endgroup$ – Abdalrhman Jun 17 '19 at 15:59
