code: def _construct_general_key(mutable_id, mutable_layer_id):
      # Mutable layer key in a general (search space) format
      # that is, prefix/mutable_id/mutable_layer_id
      return (
          _MUTABLE_LAYER_SPACE_PREFIX
          + "/"
          + 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 6 for calling a global function with example usage: _construct_general_key(mutable_id, mutable_layer_id) and returns: unknown