code: def test_classify_requires_classes_or_scores(self):
      with self.assertRaisesRegex(
          ValueError,
          "Cannot create a ClassificationOutput with empty arguments",
      ):
          export_output_lib.ClassificationOutput()
  
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 4 for calling the ExportOutputTest obj's underlying member method code with example usage: obj.test_classify_requires_classes_or_scores() without return types