fix doc and delete unused file

delete unused code

some bug and doc fix

fix little bug

add readme for examples

fix doc for 0.5.0

fix gpu/serve.py code error

[DOC] Add doc for xpu, add two example

Readme Fix

add paddle detection and fix dependency

fix some doc and add abtest

fix grpc_impl_bug and add readme by HexToString

Update get_model.sh

fix_MultiLangServer_bug and encryption doc

fix Codestyle

use paddle 2.0.0 fix encryption and some doc

Fit a line - Auto shape

fix encryption get_data.sh bug

fix bert_web_service_gpu and fix doc

support multiple devices(cpu/gpu/trt/xpu/arm) in pipeline mode

Fix Readme 0.4

[WIP] 0.4 index page readme