code: def test_graph_cnn():
      num_filters = 20
      layer = dc.models.layers.GraphCNN(num_filters)
      config = layer.get_config()
      layer_copied = dc.models.layers.GraphCNN.from_config(config)
  
      assert layer_copied.num_filters == layer.num_filters
  
imports: import deepchem
  import pytest
label_desc: Use image node_id 18 for calling a global function with example usage: test_graph_cnn() without return types