code: def test_single_output_for_parallel_layers(self):
      left = layers.Sigmoid(5, name="output")
      right = layers.Relu(10) >> left
      network = layers.Input(10) >> (left | right)
  
      self.assertEqual(len(network.output_layers), 1)
  
      output_layer = network.output_layers[0]
      self.assertEqual(output_layer.name, "output")
  
file_path: neupy/tests/layers/graph/test_extra_features.py
imports: from neupy import layers
  from base import BaseTestCase
label_desc: Use image node_id 2 for calling the GraphExtraFeaturesTestCase obj's underlying member method code with example usage: obj.test_single_output_for_parallel_layers() without return types