fix gpu/serve.py code error

add paddle detection and fix dependency

fix some doc by HexToString

fix grpc_impl_bug and add readme by HexToString

fix cmake problem and gpu serve

fix_MultiLangServer_bug and encryption doc

Compatible with Python 3 syntax

fix Codestyle

use paddle 2.0.0 fix encryption and some doc

Auto shape for Web Service

support cuda10.1 10.2 TensorRT and fix some bug

brpc reduce BTHREAD_MIN_CONCURRENCY from 4 to 2

[WIP] 0.4 index page readme

Fix invalid variable 'path'

This reverts commit cb37efc0.

support encryption model

fix bugs in examples

Threaded Flask for local predictor

Supporting the local predictor in pipeline server