code: def _get_model_single_output():
      x = Input(shape=(3,), name="input_a")
      output_a = layers.Dense(1, name="output_a")(x)
      model = Model(x, output_a)
      return model
  
imports: import numpy
  import pytest
  from absl.testing import parameterized
  from keras import layers
  from keras import testing
  from keras.layers.core.input_layer import Input
  from keras.models.functional import Functional
  from keras.models.model import Model
  from keras.models.model import model_from_json
label_desc: Use image node_id 4 for calling a global function with example usage: _get_model_single_output() and returns: model