* fix mobilenet bug

* fix inplce warning

* refine auto download logs

* add BSN and BMN models to PaddleVideo

* modify codes to fix metrics evaluation and readme

* add copyright for gen_infer_list.py and modify the content of README

* add BSN and BMN in models/README.md

refine image classification and add 19 pre-trained models.

Add PaddleSeg submodule to PaddleCV

In PaddleDetection,  making use of tb-paddle to record data, so as to display in TensorBoard.  (#3295)

* use tb_paddle to log data
including:

* loss
* mAP
* image

* modified:   requirements.txt
* modify the missing argument --use_tb
* modify GETTING_STARTED.md and docs/GETTING_STARTED_cn.md

add the argument of tb-paddle in docs.
* optimize the display name of image displaying.

* remove use_inplace=True and add save_step params

* remove useless params when using global pooling

fix lsr bug in image classification

* Refine Image classification

* Add benchmark (fps) in MODEL_ZOO doc

* fix add map_type

* Refine arguments of ocr models.

* Add comments for issue of attention model in paddle1.5

* fix used

This reverts commit 5e41760f.

* minor fix for PaddleDetection

* fix SENet154_vd name

* fix bug in sharedmemory
* fix bug in sharedmemory

* fix reader, metrics, frameworks to increase universality of PaddleVideo

* change config files from .txt to .yaml

* fix input to use PyReader and modify on readme to fit new codes

* adjust code structure and modify configs and readme to fit standard

* modify links of pdparams in readme and scripts

* fix pickle.dump in python3 and modify on readme of attention_lstm

* add description of weights argument in eval/predict/inference_model.py

* add cascade gn

* add cascade mask gn config

* update configs

* fix train on VOC on multi-GPU hang

* not set persistable in parse_fetches

* fix rpn_only in cascade mask fpn

* fix rpn_only in cascade rcnn