docs: def model_code_key_prefix(code_location_key_prefix, model_name, image):
      """Returns the s3 key prefix for uploading code during model deployment
  
      The location returned is a potential concatenation of 2 parts
          1. code_location_key_prefix if it exists
          2. model_name or a name derived from the image
  
      Args:
          code_location_key_prefix (str): the s3 key prefix from code_location
          model_name (str): the name of the model
          image (str): the image from which a default name can be extracted
  
      Returns:
          str: the key prefix to be used in uploading code
      """
      training_job_name = sagemaker.utils.name_from_image(image)
      return '/'.join(filter(None, [code_location_key_prefix, model_name or training_job_name]))