code: def test_gcn_lstm_save_load(tmpdir, arange_graph):
      gen = SlidingFeaturesNodeGenerator(arange_graph, 2, batch_size=3)
      gcn_lstm = GCN_LSTM(None, None, [2], [4], generator=gen)
      test_utils.model_save_load(tmpdir, gcn_lstm)
  
imports: import numpy
  import pandas
  import pytest
  from tensorflow.keras import Model
  from stellargraph import StellarGraph, IndexedArray
  from stellargraph.layer import GCN_LSTM
  from stellargraph.layer import FixedAdjacencyGraphConvolution
  from stellargraph.mapper import SlidingFeaturesNodeGenerator
  from ..None import test_utils
label_desc: Use image node_id 12 for calling a global function with example usage: test_gcn_lstm_save_load(tmpdir, arange_graph) without return types