code: def test_highway():
      activation_fn = "relu"
      biases_initializer = "zeros"
      weights_initializer = None
  
      layer = dc.models.layers.Highway(
          activation_fn, biases_initializer, weights_initializer
      )
      config = layer.get_config()
      layer_copied = dc.models.layers.Highway.from_config(config)
  
      assert layer_copied.activation_fn == layer.activation_fn
      assert layer_copied.biases_initializer == layer.biases_initializer
      assert (
          layer_copied.weights_initializer == layer.weights_initializer
      )
  
imports: import deepchem
  import pytest
label_desc: Use image node_id 19 for calling a global function with example usage: test_highway() without return types