Merge pull request !7631 from xutianchun/mulit

Merge pull request !7649 from yuchaojie/quant3

Merge pull request !7633 from yuchaojie/quant2

Merge pull request !7583 from chenzhongming/zomi_master

Merge pull request !7530 from jiangzhiwen/lite/image_divide

Merge pull request !7598 from zyli2020/init_in_server

Merge pull request !7518 from anancds/tcp-server

Merge pull request !7632 from fuzhiye/tmp

Merge pull request !7627 from 王东旭/opencl_conv_remove_codegen

Merge pull request !7623 from xulei/lite_test0905

linting errors fix

comments cleanup

typo fix in doc

added more tests, fixed some formatting

changed expected dx values for linter

pylint const data fix

Merge pull request !7658 from EricZ/add_ir_folder

Merge pull request !7609 from h.farahat/cache_c++_api

Merge pull request !7483 from 34bunny/GPU-ucs

Merge pull request !7537 from Peilin/cbg-new-gpu-ops-repeat_elements

Merge pull request !7622 from yeyunpeng2020/primitive

Merge pull request !7513 from ghzl/kmeans-quant

Merge pull request !7192 from zhengjun10/transformer

Merge pull request !7635 from zhanghaibo/master

Merge pull request !7640 from zhanyuan/tmp

Merge pull request !7641 from jiangzhenguang/amend_deeplabv3_readme_in_master

Merge pull request !7628 from liyanliu96/liyan

Merge pull request !7626 from qujianwei/master

Merge pull request !7636 from baiyangfan/mode_export_bug

Merge pull request !7630 from liubuyu/master

2.free reduandent memory in fp16 kernels