code: def calc_step_size(window_size, step_size):
      return int(math.floor(window_size * step_size))
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  import math
  import time
  import warnings
  import numpy
label_desc: Use image node_id 4 for calling a global function with example usage: calc_step_size(window_size, step_size) and returns: int