code: def default_fused_keys_renamer(keys, max_fused_key_length=120):
      """Create new keys for ``fuse`` tasks.
  
      The optional parameter `max_fused_key_length` is used to limit the maximum string length for each renamed key. If
      this parameter is set to `None`, there is no limit.
  
      """
      it = reversed(keys)
      first_key = next(it)
      typ = type(first_key)
  
      if max_fused_key_length:  # Take into account size of hash suffix
          max_fused_key_length -= 5
  
      def _enforce_max_key_limit(key_name):
          if (
              max_fused_key_length
              and len(key_name) > max_fused_key_length
          ):
              name_hash = f"{hash(key_name):x}"[:4]
              key_name = (
                  f"{key_name[:max_fused_key_length]}-{name_hash}"
              )
          return key_name
  
      if typ is str:
          first_name = key_split(first_key)
          names = {key_split(k) for k in it}
          names.discard(first_name)
          names = sorted(names)
          names.append(first_key)
          concatenated_name = "-".join(names)
          return _enforce_max_key_limit(concatenated_name)
      if (
          typ is tuple
          and len(first_key) > 0
          and isinstance(first_key[0], str)
      ):
          first_name = key_split(first_key)
          names = {key_split(k) for k in it}
          names.discard(first_name)
          names = sorted(names)
          names.append(first_key[0])
          concatenated_name = "-".join(names)
          return (
              _enforce_max_key_limit(concatenated_name),
          ) + first_key[1:]
      return None
  
imports: import math
  import numbers
  from enum import Enum
  from flash.core.serve.dag.task import flatten, get, get_dependencies, ishashable, istask, reverse_dict, subs, toposort
  from flash.core.serve.dag.utils import key_split
  from flash.core.utilities.imports import _TOPIC_SERVE_AVAILABLE
label_desc: Use image node_id 9 for calling a global function with example usage: default_fused_keys_renamer(keys, max_fused_key_length) and returns: None, key_name, _enforce_max_key_limit, unknown