def segmentKeyForLabel(self, label):
        return self._mapLabelsToKeys[label]
given a label in the 'done' overlay, return the key of the group that
dataset/ETHPy150Open ilastik/ilastik-0.5/ilastik/modules/interactive_segmentation/core/interactiveSegmentationModuleMgr.py/InteractiveSegmentationItemModuleMgr.segmentKeyForLabel