code: def _find_contours(*args, **kwargs):
      cv2 = tfds.core.lazy_imports.cv2
      tuple_ = cv2.findContours(*args, **kwargs)
      if (
          len(tuple_) == 2
      ):  # Recent opencv returns: (contours, hierachy)
          return tuple_[0]
      elif (
          len(tuple_) == 3
      ):  # Old opencv returns: (ret, contours, hierachy)
          return tuple_[1]
      else:
          raise AssertionError("Unknown {}")
  
imports: import csv
  import os
  import re
  from absl import logging
  import numpy
  from tensorflow_datasets.core.utils.lazy_imports_utils import tensorflow
  import tensorflow_datasets.public_api
label_desc: Use image node_id 6 for calling a global function with example usage: _find_contours() and returns: tuple_, tuple_