* Enable profiler for static training.

* Polish the initialize of ProfilerOptions.

* Enable profiler for dynamic mode.

* fix loss reduce from dict to list

* remove note

* Support Visual DL

* Fix VDL

* Add doc of VDL, test=document_fix

* Add the en doc of VDL, test=document_fix
Co-authored-by: Nlittletomatodonkey <2120160898@bit.edu.cn>

* add eta info

* rm duplicate desc

* Adapt to PaddleHub2.0 to eliminate warning
* Fix the training log format

* fix eval script

* fix dali shell

* add support for multi cards eva

fix log benchmark

1. fix dist training 
2. fix cpp infer to support dir inference

polish codes and docs to adapt Paddle2.0-rc

This reverts commit 17c66f42.

The bug had been fixed by another way.