old_contents: # Copyright (c) 2013, 2014 GPy authors (see AUTHORS.txt).
  # Licensed under the BSD 3-clause license (see LICENSE.txt)
  
  from .kernel import Kernel
  from .linear import Linear
  from .mlp import MLP
  from .additive import Additive
  from .compound import Compound
  from .constant import Constant
  
  
new_contents: # Copyright (c) 2013, 2014 GPy authors (see AUTHORS.txt).
  # Licensed under the BSD 3-clause license (see LICENSE.txt)
  
  from .kernel import Kernel
  from .linear import Linear
  from .mlp import MLP
  from .additive import Additive
  from .compound import Compound
  from .constant import Constant
  from .identity import Identity
  from .piecewise_linear import PiecewiseLinear
  
  
subject: fix #392