code: def _resolve_target_formatter(
      a: Type[TargetFormatter], b: Type[TargetFormatter]
  ) -> Type[TargetFormatter]:
      """The purpose of this resolution function is to enable reduction of the ``TargetFormatter`` type over multiple
      targets. For example, if one target formatter type is ``CommaDelimitedMultiLabelTargetFormatter`` and the other type
      is ``SingleLabelTargetFormatter``then their reduction will be ``CommaDelimitedMultiLabelTargetFormatter``.
  
      Raises:
          ValueError: If the two target formatters could not be resolved.
  
      """
      if a is b:
          return a
      if a in _RESOLUTION_MAPPING and b in _RESOLUTION_MAPPING[a]:
          return b
      if b in _RESOLUTION_MAPPING and a in _RESOLUTION_MAPPING[b]:
          return a
      raise ValueError(
          "Found inconsistent target formats. All targets should be either: single values, lists of values, or "
          "comma-delimited strings."
      )
  
imports: from dataclasses import dataclass
  from functools import reduce
  from typing import Any, ClassVar, Dict, List, Optional, Tuple, Type, Union, cast
  import numpy
  import torch
  from torch import Tensor
  from flash.core.data.utilities.sort import sorted_alphanumeric
  from flash.core.utilities.imports import _TOPIC_CORE_AVAILABLE
label_desc: Use image node_id 5 for calling a global function with example usage: _resolve_target_formatter(a, b) and returns: a, b, a