code: def test_gru():
      n_hidden = 100
      init = "glorot_uniform"
      layer = dc.models.layers.GatedRecurrentUnit(n_hidden, init)
      config = layer.get_config()
      layer_copied = dc.models.layers.GatedRecurrentUnit.from_config(
          config
      )
  
      assert layer_copied.n_hidden == layer.n_hidden
      assert layer_copied.init == layer.init
  
imports: import deepchem
  import pytest
label_desc: Use image node_id 29 for calling a global function with example usage: test_gru() without return types