This user report below summarizes the issue, which is reproducible with the latest nightly and stable releases of Slicer. It appears that the generator succeeds in creating a label node representation in https://github.com/AIM-Harvard/SlicerRadiomics/blob/master/SlicerRadiomics/SlicerRadiomics.py#L544-L550, and also if the segmentation is exported into a labelmap node, then feature extraction works with that labelmap node defining the mask.
This user report below summarizes the issue, which is reproducible with the latest nightly and stable releases of Slicer. It appears that the generator succeeds in creating a label node representation in https://github.com/AIM-Harvard/SlicerRadiomics/blob/master/SlicerRadiomics/SlicerRadiomics.py#L544-L550, and also if the segmentation is exported into a labelmap node, then feature extraction works with that labelmap node defining the mask.
https://discourse.slicer.org/t/support-3d-slicer-and-pyradiomics/18474