* bert benchmark fleet support pure_fp16

* fix use_pure_fp16

fix the pure fp16 of argument (#5236)

nlp bert benchmark add gradient merge

* add the xpu support the the paddlenlp

* add the support xpu for the ernie and bert
Co-authored-by: Nwawltor <fanzeyang0904@hotmail.com>

change the format for the bert benchmark (#5160)

* update the readme for the benchmark

* udpate README file for the bert benchmark

* uddate the readme format for the benchmark bert
Co-authored-by: Nwawltor <fanzeyang0904@hotmail.com>
Co-authored-by: Nfangzeyang <fangzeyang@baidu.com>

* add custom op gelu

* refine run_pretrain

* add the support of amp for the fleet train
* remove the attribute for the amp