code: def penalty3(x):  # <= 0.0
      from math import pi
  
      return (
          -pi * x[2] ** 2 * x[3]
          - (4 / 3.0) * pi * x[2] ** 3
          + 1296000.0
      )
  
file_path: mystic/examples2/vessel_alt.py
imports: from vessel import objective, bounds, xs, ys
  from mystic.constraints import as_constraint
  from mystic.penalty import quadratic_inequality
label_desc: Use image node_id 3 for calling a global function with example usage: penalty3(x) and returns: unknown