code: def _to_labels_map_rev(classes):
      return {c: i for i, c in enumerate(classes)}
  
imports: import logging
  import os
  import warnings
  import yaml
  import eta.core.utils
  import fiftyone.core.labels
  import fiftyone.core.storage
  import fiftyone.utils.data
label_desc: Use image node_id 13 for calling a global function with example usage: _to_labels_map_rev(classes) and returns: unknown