code: def is_unavailable(obj):
      """Helper to check if given symbol is actually a placeholder"""
      return type(obj) is UnavailableMeta
  
imports: import importlib
  import traceback
  from contextlib import contextmanager
  from cuml.internals.device_support import CPU_ENABLED, GPU_ENABLED
  from cuml.internals import logger
label_desc: Use image node_id 3 for calling a global function with example usage: is_unavailable(obj) and returns: unknown