code: def get_rect_ymax(data):
      """Find maximum y value from four (x,y) vertices."""
      return max(data[0][1], data[1][1], data[2][1], data[3][1])
  
imports: import math
  import datetime
  import warnings
  import matplotlib.dates
label_desc: Use image node_id 23 for calling a global function with example usage: get_rect_ymax(data) and returns: max