code: def image_data_format():
      """Returns the default image data format convention.
  
      Returns:
          A string, either `'channels_first'` or `'channels_last'`
  
      Example:
      >>> tf.keras.backend.image_data_format()
      'channels_last'
      """
      return _IMAGE_DATA_FORMAT
  
imports: from tensorflow.python.util import dispatch
label_desc: Use image node_id 5 for calling a global function with example usage: image_data_format() and returns: _IMAGE_DATA_FORMAT