code: def fun(self, x):
      time.sleep(40e-6)
      return rosen(x)
  
imports: import time
  import numpy
  from numpy import sin, cos, pi, exp, sqrt, abs
  from scipy.optimize import rosen
label_desc: Use image node_id 1 for calling the SlowRosen obj's underlying member method code with example usage: obj.fun(x) and returns: rosen