code: def get_reader(reader):
      reader = reader.lower()
      if reader not in READERS:
          raise ValueError('"{}" is not a valid reader'.format(reader))
  
      return READERS[reader]
  
imports: from .base_reader import BaseReader, InvalidDataDirectory
  from .object_detection import ObjectDetectionReader
  from .object_detection import COCOReader, CSVReader, FlatReader, ImageNetReader, OpenImagesReader, PascalVOCReader, TaggerineReader
label_desc: Use image node_id 1 for calling a global function with example usage: get_reader(reader) and returns: READERS