Created by: wwhu

resolve #11 (closed) Note: This model may encounter "Floating point exception" after training on several mini-batches. Scheduled sampling need to use the api multiplex_layer (PaddlePaddle/Paddle#1753), which has not been implemented in current Paddle version. I implemented this layer in my repositories (https://github.com/wwhu/Paddle/blob/ss-dev/python/paddle/trainer_config_helpers/layers.py). I will post a PR to the official Paddle repository after I write the unit test for it.