Don't assume YXCZ stack when creating accessor

model_server/extensions/ilastik/models.py

@@ -282,7 +282,7 @@ class IlastikObjectClassifierFromPixelPredictionsModel(IlastikModel, ImageToImag
                     norm_mask = 1.0 * mask.data
                 else:
                     norm_mask = mask.data / np.iinfo(mask.dtype).max
-                norm_mask_acc = mask._derived_accessor()(norm_mask.astype('float32'))
+                norm_mask_acc = mask._derived_accessor(norm_mask.astype('float32'))
                 return super().label_instance_class(img, norm_mask_acc, pixel_classification_channel=px_ch)
         return _Mod(params={'project_file': self.project_file})