code: def via_bbox_class_map():
      classes = sorted({"z", "c", "n", "o"})
  
      return ClassMap(classes=classes)
  
imports: import pytest
  from icevision import *
  from icevision.imports import *
  from icevision.models.torchvision import faster_rcnn, keypoint_rcnn
  from icevision.models.ross import efficientdet
  from icevision.models.ross.efficientdet.backbones import *
  import albumentations
label_desc: Use image node_id 22 for calling a global function with example usage: via_bbox_class_map() and returns: ClassMap