code: def __init__(self, op, func_graph_name):
      tensor = op.outputs[0]
      msg = "An unexpected placeholder was encountered ({})".format(
          tensor
      )
      super().__init__(msg)
      self.tensor = tensor
      self.func_graph_name = func_graph_name
  
imports: import collections
  import copy
  import hashlib
  import itertools
  from typing import Iterable, List, Mapping, Optional, Set, Union
  import uuid
  from absl import logging
  import tensorflow
  from tensorflow_transform import analyzer_nodes
  from tensorflow_transform import common_types
  from tensorflow_transform import nodes
  from tensorflow_transform import tf_utils
  from tfx_bsl.types import tfx_namedtuple
  from tensorflow.python.framework import composite_tensor
  from tensorflow.python.framework import func_graph
  from tensorflow.python.framework import function_def_to_graph
  from tensorflow.python.util import object_identity
label_desc: Use image node_id 1 to create a new _UnexpectedPlaceholderError object from inherited base classes: Exception with example: obj = _UnexpectedPlaceholderError(op, func_graph_name)