code: def _get_repo_url():
      
      default_repo = 'https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/'
      repo_url = os.environ.get('MXNET_GLUON_REPO', default_repo)
      if repo_url[-1] != '/':
          repo_url = repo_url+'/'
      return repo_url
docs: Return the base URL for Gluon dataset and model repository.