code: def _get_version_of_op(
      op_variants: Dict[AvailableTarget, Type[Operation]],
      opset_version: AvailableTarget,
  ) -> Type[Operation]:
      """
      A utility function that retrieves an op cls given a dictionary of op variants and target version
      """
      assert isinstance(op_variants, dict)
      opset_versions = list(op_variants.keys())
      opset_versions.sort()
      if opset_version is None:
          op_cls = op_variants[opset_versions[0]]
      elif (
          opset_version > opset_versions[-1]
          and opset_version > AvailableTarget.iOS17
      ):
          # TODO(rdar://111114658): Remove when no longer required.
          # Inherit ops from the latest opset by default.
          op_cls = op_variants[opset_versions[-1]]
      else:
          if opset_version not in op_variants:
              op_type = list(op_variants.values())[0].__name__
              msg = (
                  "No available version for {} in the coremltools.target.{} opset. Please update the "
                  "minimum_deployment_target to at least coremltools.target.{}"
              ).format(
                  op_type, opset_version.name, opset_versions[0].name
              )
              raise ValueError(msg)
          op_cls = op_variants[opset_version]
      return op_cls
  
label_desc: Use image node_id 1 for calling a global function with example usage: _get_version_of_op(op_variants, opset_version) and returns: op_cls