code: def powell_chebyshev(x0, *args, **kwds):
      # Powell's Directonal solver
      from optimize_helper import fmin_powell as the_solver
  
      # Chebyshev cost function
      from poly import chebyshev4cost as the_model
  
      return the_solver(the_model, x0, monitor=False, *args, **kwds)
  
label_desc: Use image node_id 2 for calling a global function with example usage: powell_chebyshev(x0) and returns: the_solver