text: # Copyright 2018/2019 The RLgraph authors. All Rights Reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  # ==============================================================================
  
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  from rlgraph.components.neural_networks.stack import Stack
  from rlgraph.components.neural_networks.dict_preprocessor_stack import DictPreprocessorStack
  from rlgraph.components.neural_networks.preprocessor_stack import PreprocessorStack
  
  from rlgraph.components.neural_networks.neural_network import NeuralNetwork
  from rlgraph.components.neural_networks.value_function import ValueFunction
  
  # The Stacks.
  Stack.__lookup_classes__ = dict(
      dictpreprocessorstack=DictPreprocessorStack,
      preprocessorstack=PreprocessorStack
  )
  
  __all__ = ["NeuralNetwork", "ValueFunction"] + \
            ["Stack"] + \
            list(set(map(lambda x: x.__name__, Stack.__lookup_classes__.values())))
  