code: def _verify_repo_ref(repo: str) -> bool:
      """Verifies whether the given model repo can be trusted.
      A model repo can be trusted if it matches onnx/models:main.
      """
      repo_owner, repo_name, repo_ref = _parse_repo_info(repo)
      return (
          (repo_owner == "onnx")
          and (repo_name == "models")
          and (repo_ref == "main")
      )
  
imports: import hashlib
  import json
  import os
  import sys
  import tarfile
  from io import BytesIO
  from os.path import join
  from typing import IO, Any, Dict, List, Optional, Set, Tuple, cast
  from urllib.error import HTTPError
  from urllib.request import urlopen
  import onnx
label_desc: Use image node_id 4 for calling a global function with example usage: _verify_repo_ref(repo) and returns: unknown