update mask detection demo

test=develop
test=document_fix

* Support lac model, fix bug for argmax lod_reset, 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 tiny_publish link error when open LOG

* add post training quantization and weight quantization docs

fix: move quant op to basic

skip fusing quantized conv2d + relu6 for now

Optimize cuda kernel and remove io_copy added by default due to missing fetch_cuda kernel

add multiclass_nms2 kernel, test=develop

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

* fix: update fpga doc
test=document_fix

* fix: update fpga doc & delete useless index.rst

* fix: update fpga md and index
     delete useless index.rst
     test=document_fix
     test=develop

* fix: add support_hardware md

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

* fix compile. test=develop

* fix: update fpga doc
test=document_fix

* fix: update fpga doc & delete useless index.rst

* fix: update fpga md and index
     delete useless index.rst
     test=document_fix
     test=develop

* add cv to index, test=develop, test=document_fix

* update support ops and kernels for release 2.3