* modified fluid to paddle API (#174)

* modified fluid to paddle API

* supplement zh_CN documents

* sovle ugatit bug (#178)

* Fix 2.0-beta bugs (#183)

* fix 2.0-beta bugs

* update pretreained path

* add extract_weight.py
Co-authored-by: Nwangna11BD <79366697+wangna11BD@users.noreply.github.com>

* fix some errors in test

* add configuration options (#164)

e.g. python tools/main.py --c configs/stylegan_v2_256_ffhq.yaml -o total_iters=1 log_config.visiual_interval=1

* fix vgg19 url (#167)
Co-authored-by: lyl120117 <278401555@qq.com>

* adapt animegan

* clean code
Co-authored-by: Nqingqing01 <dangqingqing@baidu.com>

* add drn model

* add stylegan model

* add automatic weight download

* add wav2lip trainning code

* add lesrcnn model

* Add photo2cartoon model
* Resolve conflicts
* Remove comments
* Add photo2cartoon tutorial
* update p2c tutorials

* add stylegan2 and pixel2style2pixel models, predictors and documents

* fix some bug

* add esrgan model, refine codes

* add some custom gan models

* add animeganv2 network and dataset
* animegan:refine code,add License
Co-authored-by: Nqingqing01 <dangqingqing@baidu.com>

* Add Wav2Lip generator.

* fix auto downloading problem of dlib weight and add s3fd face detector

* add ugatit model

* docs: update install instruction

1. paddlepaddle2.0.0rc instruction can be found from main page
2. only two steps, install paddlepaddle and paddlegan, other than 3step

* docs: update en install
* feat: add dcgan
* reform: debug with mnist datset
validate performance with different options, and original structure and setting

* refine codes docs

* fix pix2pix to_tensor

* fix apps

* refine duplicate frames and fix some bugs

* add face_parse predictor in apps

* add art model of deoldify

* update psgan pretrained model link in the tutorial doc

* add psgan and fom tutorial doc

* Add doc for Apps and refine some code
* Add how to switch cpu and gpu

* refine code

* test

* fix apps

* update readme

* rm unused code

* fix apps output when input is image

* clean code

* update requirements.txt