Created by: lcy-seso

• In this example, we would like to show some different configuration for seq2seq task.
• Please refer to the following two configuration files:
  1. grid lstm written in old PaddlePaddle API.
  2. encoder-decoder without attention written in old PaddlePaddle API.
• The example must include the training and the generating process.
• Please pull your codes and docs into the seq2seq directory.