text: # Copyright 2019 The TensorTrade Authors.
  #
  # 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
  
  import tensorflow as tf
  import numpy as np
  import pandas as pd
  
  from gym import spaces
  from typing import Dict
  
  from tensortrade.trades import Trade, TradeType
  from tensortrade.slippage import RandomUniformSlippageModel
  from tensortrade.exchanges import Exchange
  
  
  class GANExchange(Exchange):
      """A simulated exchange, in which the price history is based off a generative adversarial network
      model with supplied parameters.
  
      If the `training_data` parameter is not supplied upon initialization, it must be set before
      the exchange can be used within a trading environment.
      """
  
      def __init__(self, training_data: pd.DataFrame = None, **kwargs):
          super().__init__(**kwargs)
  
          self._training_data = self.default('training_data', training_data)
  
          raise NotImplementedError()
  
      def reset(self):
          super().reset()
  