code: def image_data_format():
      """Return the default image data format convention.
  
      Returns:
          A string, either `'channels_first'` or `'channels_last'`.
  
      Example:
  
      >>> keras.config.image_data_format()
      'channels_last'
  
      """
      return _IMAGE_DATA_FORMAT
  
file_path: keras/keras/backend/config.py
imports: import json
  import os
  from keras.api_export import keras_export
label_desc: Use image node_id 5 for calling a global function with example usage: image_data_format() and returns: _IMAGE_DATA_FORMAT