code: def map_missing_dict_keys(y_pred, struct):
      """Replaces missing dict keys in `struct` with `None` placeholders."""
      if not isinstance(y_pred, dict) or not isinstance(struct, dict):
          return struct
      for k in y_pred.keys():
          if k not in struct:
              struct[k] = None
      return struct
  
imports: import copy
  from tensorflow.python.distribute import distribute_lib
  from tensorflow.python.keras import losses
  from tensorflow.python.keras import metrics
  from tensorflow.python.keras.utils import generic_utils
  from tensorflow.python.keras.utils import losses_utils
  from tensorflow.python.keras.utils import tf_utils
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.util import nest
label_desc: Use image node_id 5 for calling a global function with example usage: map_missing_dict_keys(y_pred, struct) and returns: struct, struct