Fix the output of cnn in DSSM.

fix urls in nmt_without_attention's doc

Fix resnet_cifar10 in image_classification.

Update README.md

root README.cn.md point to the README file with specific language.

recover the READEME.cn.md for CTR

Redirect ds2 in README.

Fix the default model saving dir in NER.

Add tf2paddle to convert TensorFlow models to PaddlePaddle models.

Reorganize codes of LTR.

delete obsolete annotations of conv_seq2seq.

Fix shared parameters in nested text classification .

Refine NER.

Add sum eval for generate_sequence_by_rnn_lm.

fix a typo.

restructure the code of scheduled sampling

Update readme for deepfm.