code: def set_s3_region() -> None:
      bucket = os.environ.get("AWS_BUCKET")
      if bucket is None:
          return
  
      endpoint_url = os.environ.get("DET_S3_ENDPOINT_URL")
      client = boto3.client("s3", endpoint_url=endpoint_url)
      bucket_location = client.get_bucket_location(Bucket=bucket)
  
      region = bucket_location["LocationConstraint"]
  
      if region is not None:
          # We have observed that in US-EAST-1 the region comes back as None
          # and if AWS_REGION is set to None, tensorboard fails to pull events.
          print(f"Setting AWS_REGION environment variable to {region}.")
          os.environ["AWS_REGION"] = str(region)
  
imports: import json
  import logging
  import os
  import queue
  import subprocess
  import sys
  import tempfile
  import threading
  import time
  from typing import Any, Callable, Dict, List
  import boto3
  import requests
  from packaging import version
  import determined
  import determined.common
  from determined.tensorboard import fetchers
label_desc: Use image node_id 1 for calling a global function with example usage: set_s3_region() without return types