code: def preprocess_input(x):
      """Preprocesses a tensor encoding a batch of images.
  
      # Arguments
          x: input Numpy tensor, 4D.
          data_format: data format of the image tensor.
  
      # Returns
          Preprocessed tensor.
      """
  
      # 'RGB'->'BGR'
      x *= 1.0 / 255
  
      return x
  
label_desc: Use image node_id 1 for calling a global function with example usage: preprocess_input(x) and returns: x