* Ehance mobilenetv1/v2, add std_dev computation. test=develop

* Ehance cxx mobile_light demo, add std_dev computation. test=develop

* * support download bm_sdk, test=develop

* [LITE][BM] add slice op

* [LITE][BM] fix concat issue

* [LITE][BM] support reduce full ops, test=develop

* [LITE][BM] change test_resnet50 to change test_classify

* [LITE][BM] add cast op

* [LITE][BM] add reduce and other ops, test=develop

* [LITE][BM] add reduce,cast and other ops, test=develop

add cuda ci.

Organize cuda compilation products.

* add mean op, test=develop

* split forward and backward, test=develop

* fix clang compile armv8 cpu 's shared lib. test=develop

* use build-in shared helper function. test=develop

* [CORE] Support Clang compiling for Android
test=develop

* fix lto for jni so
test=develop

* disable assembly code
test=develop

* disable layout.cc
test=develop

* refine
test=develop

* Enable LTO on Clang
test=develop

* Disable LTO when clang is used.
test=develop

* Remove space
test=develop

* [Core] enable clang in build.sh
test=develop

* [Core] Remove the workaround for clang compiling
test=develop

* [LITE][CMAKE] support clang compile for armv8 cpu. test=develop

* add build for clang. test=develop

* fix cmake format. test=develop

* fix: fix nlp ops input and output type
* fix: add elementwise x_dims>y_dims case

* Fix act bug for opencl kernel. test=develop

* add print ActToStr. test=develop

* remove print code. test=develop

add opencl kernel build list; set num cores to build opencl in ci_build.sh and build.sh. test=develop (#3081)

* add grid sampler

* reset act

* fix conflict and readme, test=develop

* fix ios v8 run error

* fix grid_sampler compute error. test=develop

* fix exp act run error, test=develop

* fix format, test=develop

* [LITE][OPENCL] Support video-sr feature using OpenCL FP16 Image. test=develop

* optimize image2d_to_buffer_with_post255. test=develop

* add def debug in cl kernel. test=develop

* remove conv image code in conv buffer. test=develop

* Update benchmark to support setting model and param filename

* replace vlog with log in pool, add each run duration print in test. test=develop

* change layout file path. test=develop

* fix act, layout image kernel. test=develop

* fix spell error. test=develop

* remove clfinish in act, concat, layout, nearest_interp. test=develop

* add RELU macro define in fc opencl kernel. test=develop

* add cpu_ref print in activation opencl kernel.test=develop

* fix layout ut. test=develop

* replace log with vlog. test=develop

* fix get output. test=develop

[LITE][OPENCL] support fp16 for cl_image_converter, layout, activation all OpenCL image kernel. test=develop (#2964)

* [LITE][OPENCL] support fp16 for cl_image_converter, layout, activation image kernel. test=develop

* add conv, depthwise and UT. test=develop

* add pool, conv, nearest_interp kernel. test=develop

* support fp16 for scale, reshape, concat, fc buffer opencl kernel. test=develop

* refactor for mul opencl buffer kernel. test=develop

* support fp16 for elementwise_mul opecl image kernel. test=develop

* support fp16 for elementwise_mul opencl image kernel. test=develop

* support fp16 for ele_add, fuse_ele_add_act opencl kernel. test=develop

* rename io_copy. test=develop

* mobilenetv1,v2 passed on 855. test=develop

* fix opt for opencl. test=develop

* fix caliberate error, values from [-128, 127] to [-127, 127], test=develop
* add classify demo and detection demo, test=develop

* add weight quant for combined model after optimized, test=develop

* mobilenetv1/v2,mnasnet,yolonano,sr models passed with opencl image2d kernel. test=develop

* Fix gflag shape define. test=develop

* comment All opencl buffer kernels. test=develop

* refactor conv, depthwise into one routing selection. test=develop

fix fpga lite_tensor compile bug
     add fake quantize_abs_max op
     test=develop

* modify opt name test=develop

* fix code style test=develop

* test=develop

test=develop

* optimize quant_dequant_fuse_pass, test=develop

* update, test=develop

* update, test=develop

* fix bug for accessing the removed node, test=develop

* set the bias of int8 conv as float, test=develop

* support weight quantization, test=develop

* up, test=develop

* up, test=develop

* up, test=develop

test_model_bin support print intermediate tensor.