code: def _setup_multinode_environment():
      # setup the multinode environment variables.
      import socket
  
      if (
          "AWS_BATCH_JOB_MAIN_NODE_PRIVATE_IPV4_ADDRESS"
          not in os.environ
      ):
          # we are the main node
          local_ips = socket.gethostbyname_ex(socket.gethostname())[-1]
          assert local_ips, "Could not find local ip address"
          os.environ["MF_PARALLEL_MAIN_IP"] = local_ips[0]
      else:
          os.environ["MF_PARALLEL_MAIN_IP"] = os.environ[
              "AWS_BATCH_JOB_MAIN_NODE_PRIVATE_IPV4_ADDRESS"
          ]
      os.environ["MF_PARALLEL_NUM_NODES"] = os.environ[
          "AWS_BATCH_JOB_NUM_NODES"
      ]
      os.environ["MF_PARALLEL_NODE_INDEX"] = os.environ[
          "AWS_BATCH_JOB_NODE_INDEX"
      ]
  
imports: import os
  import sys
  import platform
  import requests
  import time
  from metaflow import util
  from metaflow import R, current
  from metaflow.decorators import StepDecorator
  from metaflow.plugins.resources_decorator import ResourcesDecorator
  from metaflow.plugins.timeout_decorator import get_run_time_limit_for_task
  from metaflow.metadata import MetaDatum
  from metaflow.metadata.util import sync_local_metadata_to_datastore
  from metaflow.metaflow_config import ECS_S3_ACCESS_IAM_ROLE, BATCH_JOB_QUEUE, BATCH_CONTAINER_IMAGE, BATCH_CONTAINER_REGISTRY, ECS_FARGATE_EXECUTION_ROLE, DATASTORE_LOCAL_DIR
  from metaflow.sidecar import Sidecar
  from metaflow.unbounded_foreach import UBF_CONTROL
  from .batch import BatchException
  from ..aws_utils import compute_resource_attributes, get_docker_registry, get_ec2_instance_metadata
label_desc: Use image node_id 1 for calling a global function with example usage: _setup_multinode_environment() without return types