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.component import Component
  from rlgraph.utils.decorators import rlgraph_api
  
  
  class Layer(Component):
      """
      A Layer is a simple Component that implements the `apply` method with n inputs and m return values.
      """
      def __init__(self, scope="layer", **kwargs):
          super(Layer, self).__init__(scope=scope, **kwargs)
  
      def get_preprocessed_space(self, space):
          """
          Returns the Space obtained after pushing the space input through this layer.
  
          Args:
              space (Space): The incoming Space object.
  
          Returns:
              Space: The Space after preprocessing.
          """
          return space
  
      @rlgraph_api
      def _graph_fn_apply(self, *inputs):
          """
          Applies the layer's logic to the inputs and returns one or more result values.
  
          Args:
              *inputs (any): The input(s) to this layer.
  
          Returns:
              DataOp: The output(s) of this layer.
          """
          raise NotImplementedError
  
  