code: def print_header_linear():
      print(
          "{0:^15}{1:^15}{2:^15}{3:^15}{4:^15}".format(
              "Iteration",
              "Cost",
              "Cost reduction",
              "Step norm",
              "Optimality",
          )
      )
  
imports: from __future__ import division, print_function, absolute_import
  from math import copysign
  import numpy
  from numpy.linalg import norm
  from scipy.linalg import cho_factor, cho_solve, LinAlgError
  from scipy.sparse import issparse
  from scipy.sparse.linalg import LinearOperator, aslinearoperator
label_desc: Use image node_id 16 for calling a global function with example usage: print_header_linear() without return types