* add tdm_demo

* fix some bugs

* edit README.md

* add models

* add ESMM

* fix some bug

* fix models because the gradient clip strategy has been upgraded,test=develop

* fix models because the gradient clip strategy has been upgraded,test=develop

* fix save error of xdeepfm
* test=develop

修复了文档中与实际代码命名有区别的问题，增加了如何启动分布式训练的通用介绍

* fix distribute local_cluster.sh

* upgrade dcn and xdeepfm, change from all old save/load api to fluid.save and fluid.load
* test=develop

* Fix ctr/dnn for v/1.7

* update1.7 save/load & fluid.data

* update datafeed to dataloader

* fix readme in gru4rec

* Update README.md (#4267)

* test=develop (#4269)

* 3d use new api (#4275)

* PointNet++ and PointRCNN use new API

* Update Readme of Dygraph BERT (#4277)

Fix some typos.

* Update run_classifier_multi_gpu.sh (#4279)

remove the CUDA_VISIBLE_DEVICES

* Update README.md (#4280)

* 17 update api (#4294)

* update1.7 save/load & fluid.data

* update datafeed to dataloader

* Update resnet_acnet.py (#4297)

Bias attr of square conv should be "False" rather than None during training mode.

* test=develop
Co-authored-by: NKaipeng Deng <dengkaipeng@baidu.com>
Co-authored-by: Nzhang wenhui <frankwhzhang@126.com>
Co-authored-by: Nparap1uie-s <parap1uie-s@users.noreply.github.com>

Upgrade API for 1.7
* PaddleRec/din
* PaddleRec/gnn

* update ctr/dnn for v/1.7

* fix gru_dygraph

* fix mmoe doc

* add args

* fix gru_dygraph

* fix mmoe doc

* add compress ce

* add ce for word2vec

* deepfm dygraph

* deepfm dygraph fix readme

* adapt dygraph dev api and fix readme

* fix eval and readme

* deepfm dygraph add infer.py, format train output

* fix bug of last commit

* add more log in train and infer. remove is_sparse

* modify ce for deeplabv3+

modify ce for auto_dialogue_evaluation

add ce for human_pose_estimation

* modify gru4rec ce

* fix paddlerec dnn loss nan

* change hash with mmh3.hash in dnn

* cherry-pick 1.6 to develop

* fix outdated layers.nn api

* fix outdated layers.nn api

* fix open utf8

* reset auc more elegant and fix bug and README in ctr/dnn

* change ctr/dnn README