docs: def validate(self, benchmarks):
          """
          Execute the code once to get it's results (to be used in function validation). Compare the result to the
          first function in the group.
          :param benchmarks: list of benchmarks to validate.
          """
          class_code = self.setup_src
          instance_creation = '\ninstance = {}'.format(self.stmt)
          for i, benchmark in enumerate(benchmarks):
              if not benchmark.result_validation:
                  break
  
              validation_code = class_code + instance_creation + '\nvalidation_result = ' + benchmark.stmt
              validation_scope = {}
              exec(validation_code, validation_scope)
              # Store the result in the first function in the group.
              if i == 0:
                  compare_against_function = benchmarks[0].callable.__name__
                  compare_against_result = validation_scope['validation_result']
                  logging.info('PyPerform: Validating group "{b.group}" against method '
                               '"{b.classname}.{b.callable.__name__}"'.format(b=benchmarks[0]))
              else:
                  if compare_against_result == validation_scope['validation_result']:
                      logging.info('PyPerform: Validating {b.classname}.{b.callable.__name__}......PASSED!'
                                   .format(b=benchmark))
                  else:
                      error = 'Results of functions {0} and {1} are not equivalent.\n{0}:\t {2}\n{1}:\t{3}'
                      raise ValidationError(error.format(compare_against_function, benchmark.callable.__name__,
                                                compare_against_result, validation_scope['validation_result']))