code: # Module to import functions from in examples for multiprocessing backend
  import numpy as np
  
  
  def obj_fun(x, noise_level=0.1):
      return np.sin(5 * x[0]) * (1 - np.tanh(x[0] ** 2)) +\
             np.random.randn() * noise_level
  
apis: numpy.sin numpy.random.randn numpy.tanh