code: def test_ClusterGCN_save_load(tmpdir):
      G, _ = create_graph_features()
      generator = ClusterNodeGenerator(G)
      cluster_gcn = ClusterGCN(
          layer_sizes=[2, 3],
          activations=["relu", "relu"],
          generator=generator,
      )
      test_utils.model_save_load(tmpdir, cluster_gcn)
  
file_path: stellargraph/tests/layer/test_cluster_gcn.py
imports: from tensorflow.keras import backend
  from stellargraph.layer.cluster_gcn import *
  from stellargraph.mapper import ClusterNodeGenerator
  from stellargraph.core.graph import StellarGraph
  import pandas
  import numpy
  from tensorflow import keras
  import tensorflow
  import pytest
  from ..test_utils.graphs import create_graph_features
  from ..None import test_utils
label_desc: Use image node_id 6 for calling a global function with example usage: test_ClusterGCN_save_load(tmpdir) without return types