code: def _parse_label(self, target, img=None):
      if target is None:
          return None
  
      if etau.is_str(target):
          annotation = fouv.VOCAnnotation.from_xml(target)
      else:
          annotation = fouv.VOCAnnotation.from_dict(target)
  
      return annotation.to_detections()
  
imports: import eta.core.utils
  import fiftyone.core.labels
  import fiftyone.core.utils
  import fiftyone.types
  import fiftyone.utils.coco
  import fiftyone.utils.data
  import fiftyone.utils.imagenet
  import fiftyone.utils.voc
  import fiftyone.zoo.datasets
label_desc: Use image node_id 2 for calling the _VOCDetectionSampleParser obj's underlying member method code with example usage: obj._parse_label(target, img) and returns: annotation, None