code: def test_weighted_linearcombo():
      std = 0.1
      layer = dc.models.layers.WeightedLinearCombo(std=std)
  
      config = layer.get_config()
      layer_copied = dc.models.layers.WeightedLinearCombo.from_config(
          config
      )
  
      assert layer_copied.std == layer.std
  
imports: import deepchem
  import pytest
label_desc: Use image node_id 9 for calling a global function with example usage: test_weighted_linearcombo() without return types