code: def print_summary(self):
      print(self.res)
  
imports: import abc
  import warnings
  import numpy
  import scipy.sparse
  import scipy.optimize
  from scipy.optimize import minimize
  from dipy.utils.optpkg import optional_package
label_desc: Use image node_id 7 for calling the Optimizer obj's underlying member method code with example usage: obj.print_summary() without return types