code: def test_combine_mean_std():
      training_only = True
      noise_epsilon = 0.001
  
      layer = dc.models.layers.CombineMeanStd(
          training_only, noise_epsilon
      )
      config = layer.get_config()
      layer_copied = dc.models.layers.CombineMeanStd.from_config(config)
  
      assert layer_copied.training_only == layer.training_only
      assert layer_copied.noise_epsilon == layer.noise_epsilon
  
imports: import deepchem
  import pytest
label_desc: Use image node_id 10 for calling a global function with example usage: test_combine_mean_std() without return types