code: def _is_dataclass_instance(obj):
      """Returns True if obj is an instance of a dataclass."""
      return not isinstance(obj, type) and hasattr(obj, _FIELDS)
  
imports: import re
  import sys
  import copy
  import types
  import inspect
  import keyword
label_desc: Use image node_id 23 for calling a global function with example usage: _is_dataclass_instance(obj) and returns: unknown