code: def sample(self, bqm, fixed_variables=None, **parameters):
          
  
          # solve the problem on the child system
          child = self.child
          bqm_copy = bqm.copy()
          if fixed_variables is None:
              fixed_variables = {}
  
          bqm_copy.fix_variables(fixed_variables)
          sampleset = child.sample(bqm_copy, **parameters)
  
          if len(sampleset):
              return sampleset.append_variables(fixed_variables)
          elif fixed_variables:
              return type(sampleset).from_samples_bqm(fixed_variables, bqm=bqm)
          else:
              # no fixed variables and sampleset is empty
              return sampleset
docs: Sample from the provided binary quadratic model.
  
          Args:
              bqm (:obj:`dimod.BinaryQuadraticModel`):
                  Binary quadratic model to be sampled from.
  
              fixed_variables (dict):
                  A dictionary of variable assignments.
  
              **parameters:
                  Parameters for the sampling method, specified by the child sampler.
  
          Returns:
              :obj:`dimod.SampleSet`