code: def test_keras_model_to_graph_def_functional_multiple_inbound_nodes_from_same_node(
      self,
  ):
      expected_proto = """
              node {
                name: "model/input_1"
                attr {
                  key: "keras_class"
                  value {
                    s: "InputLayer"
                  }
                }
                attr {
                  key: "dtype"
                  value {
                    type: DT_FLOAT
                  }
                }
              }
              node {
                name: "model/private__doubling_layer"
                input: "model/input_1"
                attr {
                  key: "keras_class"
                  value {
                    s: "_DoublingLayer"
                  }
                }
                attr {
                  key: "dtype"
                  value {
                    type: DT_FLOAT
                  }
                }
              }
              node {
                name: "model/add"
                input: "model/private__doubling_layer"
                input: "model/private__doubling_layer"
                attr {
                  key: "keras_class"
                  value {
                    s: "Add"
                  }
                }
                attr {
                  key: "dtype"
                  value {
                    type: DT_FLOAT
                  }
                }
              }
          """
      inputs = keras.Input(shape=(2,))
      doubling_layer = _DoublingLayer()
      reducing_layer = keras.layers.Add()
      outputs = reducing_layer(doubling_layer(inputs))
      model = keras.Model(inputs=[inputs], outputs=outputs)
  
      self.assertGraphDefToModel(expected_proto, model)
  
file_path: tensorboard/tensorboard/plugins/graph/keras_util_test.py
imports: import json
  import tensorflow
  from tensorboard.plugins.graph import keras_util
label_desc: Use image node_id 11 for calling the KerasUtilTest obj's underlying member method code with example usage: obj.test_keras_model_to_graph_def_functional_multiple_inbound_nodes_from_same_node() without return types