code: def cost5x3(x, axis=None):
      """a 5x3 test function, using axis
  
      For example:
        >>> cost5x3([1,2,3,4,5], axis=None)
        [13.922847983320086, -13.730919862656235, -18.0]
        >>> cost5x3([1,2,3,4,5], axis=0)
        13.922847983320086
      """
      y = function5x3(x)
      return y if axis is None else y[axis]
  
label_desc: Use image node_id 2 for calling a global function with example usage: cost5x3(x, axis) and returns: unknown