class_docstr: So that we can test the abstract class methods directly.
class_docstr_tok: ["So","that","we","can","test","the","abstract","class","methods","directly","."]
code: def _get_signature_def_fn(self):
      pass
  
imports: from tensorflow.core.framework import tensor_shape_pb2
  from tensorflow.core.framework import types_pb2
  from tensorflow.core.protobuf import meta_graph_pb2
  from tensorflow.python.eager import context
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import tensor
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import metrics
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
  from tensorflow.python.saved_model import signature_constants
  from tensorflow.python.saved_model.model_utils import export_output
label_desc: Use image node_id 1 for calling the MockSupervisedOutput obj's underlying member method code with example usage: obj._get_signature_def_fn() without return types