code: def _init_steps(self,):
          self._check_old_yaml_format()
          config_steps = self.flow_config.steps
          self._check_infinite_flows(config_steps)
          steps = []
          for number, step_config in config_steps.items():
              specs = self._visit_step(number, step_config)
              steps.extend(specs)
          return sorted(steps, key=attrgetter("step_num"))