* add dygraph prune quick_start

* add mobile deploy doc

* complete deploy doc

* add images

* fix a error;

* fix some error
Co-authored-by: Ngmm <38800877+mmglove@users.noreply.github.com>

Co-authored-by: NBai Yifan <me@ethanbai.com>

* add export model and depth

* Support for pruning training graph with auxiliary parameters

* Fix bugs

* Fix unitests.

* fix prune doc

* fix prune demo batchsize

* fix lr (#593)

* fix lr schedule in prune demo (#595)

* fix prune demo batchsize

* fix lr shcedule in prune demo
;
Co-authored-by: Nwanghaoshuang <wanghaoshuang@baidu.com>

* remove softmax from demo/models (#596)

* fix prune demo batchsize

* fix lr shcedule in prune demo
;

* remove softmax from demo/models
Co-authored-by: Nwanghaoshuang <wanghaoshuang@baidu.com>

* fix prune demo log
Co-authored-by: Nwanghaoshuang <wanghaoshuang@baidu.com>

* fix prune doc

* fix prune demo batchsize
Co-authored-by: Nceci3 <ceci3@users.noreply.github.com>

* update

* add ofa api docs

* quant quick_start update

* quant quick_start update

* fix prune demo

* migrage static api

* fix a bug

* add ofa_ernie
* add ofa_bert
* add bert and update ernie

* fix when param name is not None

* fix dygraph quant demo dataset issue

* fix dygraph quant demo dataset issue

* fix

* fix when lambda is None

* fix

* fix when mnli

* fix

* fix embedding
Co-authored-by: NBai Yifan <me@ethanbai.com>

* for bert