code: def test_graph_gather():
      batch_size = 10
      activation_fn = "relu"
  
      layer_copied = dc.models.layers.GraphGather(
          batch_size=batch_size, activation_fn=activation_fn
      )
      config = layer_copied.get_config()
      layer_copied = dc.models.layers.GraphGather.from_config(config)
  
      assert layer_copied.batch_size == layer_copied.batch_size
      assert layer_copied.activation_fn == layer_copied.activation_fn
  
imports: import deepchem
  import pytest
label_desc: Use image node_id 3 for calling a global function with example usage: test_graph_gather() without return types