code: def test_variable():
      initial_value = 10
      layer = dc.models.layers.Variable(initial_value)
      config = layer.get_config()
      layer_copied = dc.models.layers.Variable.from_config(config)
  
      assert layer_copied.initial_value == layer.initial_value
  
imports: import deepchem
  import pytest
label_desc: Use image node_id 12 for calling a global function with example usage: test_variable() without return types