How to use the ramp-engine.ramp_engine.aws.api.terminate_ec2_instance function in ramp-engine

def teardown(self):
        """Terminate the Amazon instance"""
        aws.terminate_ec2_instance(self.config, self.instance.id)
        super().teardown()

Parameters
    ----------

    config : dict
        configuration

    submission_id : int
        submission id

    """
    conf_aws = config[AWS_CONFIG_SECTION]
    instance, = launch_ec2_instances(conf_aws, nb=1)
    set_submission_state(config, submission_id, 'sent_to_training')
    _wait_until_ready(config, instance.id)
    train_on_existing_ec2_instance(config, instance.id, submission_id)
    terminate_ec2_instance(conf_aws, instance.id)

set_predictions(config, submission_id, path)
                        set_time(config, submission_id, path)
                        set_scores(config, submission_id, path)
                        set_submission_state(config, submission_id, 'tested')
                    else:
                        logger.info('Training of "{}" failed'.format(label))
                        set_submission_state(
                            config, submission_id, 'training_error')
                        error_msg = _get_traceback(
                            _get_log_content(conf_aws, submission_name)
                        )
                        set_submission_error_msg(
                            config, submission_id, error_msg)
                        _run_hook(config, HOOK_FAILED_TRAINING, submission_id)
                    # training finished, so terminate the instance
                    terminate_ec2_instance(conf_aws, instance_id)
        time.sleep(secs)