code: def _decompose_general_key(key):
      # inverse operation of above
      if not key.startswith(_MUTABLE_LAYER_SPACE_PREFIX):
          return None, None
      else:
          _, mutable_id, mutable_layer_id = key.split("/", maxsplit=2)
          return mutable_id, mutable_layer_id
  
file_path: nni/nni/common/nas_utils.py
imports: import functools
  import logging
  from ..None import trial
label_desc: Use image node_id 7 for calling a global function with example usage: _decompose_general_key(key) and returns: None,  None, mutable_id,  mutable_layer_id