code: def test_vina_free_energy():
      N_atoms = 10
      M_nbrs = 15
      ndim = 20
      nbr_cutoff = 5
      start = 1
      stop = 7
      stddev = 0.3
      Nrot = 1
  
      layer = dc.models.layers.VinaFreeEnergy(
          N_atoms, M_nbrs, ndim, nbr_cutoff, start, stop, stddev, Nrot
      )
      config = layer.get_config()
      layer_copied = dc.models.layers.VinaFreeEnergy.from_config(config)
  
      assert layer_copied.N_atoms == layer.N_atoms
      assert layer_copied.M_nbrs == layer.M_nbrs
      assert layer_copied.ndim == layer.ndim
      assert layer_copied.nbr_cutoff == layer.nbr_cutoff
      assert layer_copied.start == layer.start
      assert layer_copied.stop == layer.stop
      assert layer_copied.stddev == layer.stddev
      assert layer_copied.Nrot == layer_copied.Nrot
  
imports: import deepchem
  import pytest
label_desc: Use image node_id 13 for calling a global function with example usage: test_vina_free_energy() without return types