class_docstr: Visitor used to extract tensors that are inputs to `TensorSource` nodes.
code: def visit(self, operation_def, input_values):
      if isinstance(operation_def, analyzer_nodes.TensorSource):
          for tensor in operation_def.tensors:
              self.sourced_tensors.append(tensor)
      return nodes.OperationNode(operation_def, input_values).outputs
  
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 2 for calling the SourcedTensorsVisitor obj's underlying member method code with example usage: obj.visit(operation_def, input_values) and returns: nodes