* classifications and yolov3 works

* fix compute error in no-equal-padding. test=develop

* fix conv_ut. test=develop

* test=develop

* fix format. test=develop

* [LITE][BM] support multiclass_nms2 and fix some issues, test=develop

* create

* [LITE][BM] fix input shape order changed issue,test=develop

* [ASCEND] fix build for Ubuntu18.04 and GCC7.3, test=develop

* [ASCEND] address review comments, test=develop

* add reduce op on arm. test=develop

* fix format. test=develop

* fix acccording to comments. test=develop

* fix bilinear_resize result not equal with fluid. test=develop

* fix cv build error. test=develop


* fix format. test=develop

* fix conv_3x3s1_dw v7-compute nan. test=develop

* fix compute. tets=develop

* set sgemm basic_test is false. test=develop

* [X86] add box_coder kernel and fix compile on MAC, test=develop

* [DOC] remove debug info, test=develop

* [X86] add new op of density_prior_box, test=develop

* add scatter op on arm. test=develop

* fix cmake error. test=develop

* test=develop

[LITE][XPU] 1. Add sequence_unpad kernel for XPU; 2. Bugfix in sequence_unpad kernel for x86, as InferShapeImpl() is now empty in lite/operators/sequence_unpad_op.cc; 3. Refine TargetWrapperXPU; (#4237)

* [Bugfix][OpenCL] fix depthwise_conv2d_3x3 with dilation > 1. test=develop

* add sequence_expand_as op on arm. test=develop

* fix format. test=develop

[OP][HOST][KERNEL]Add uniform_random operator, and add host kernel for uniform_random. test=develop (#4264)

* platform portability of tls, test=develop

* update build_ios.sh, test=develop

* add static keyword for tls, test=develop

* rename the alias of tls, test=develop

* [BugFix][OpenCL] Fix concat image impl when concat axis is not 1

* fix code when axis == 1. test=develop

* fix illegal access when print debug info. test=develop

* fix typo

* [KERNEL][OPENCL] support opencl concat 3inputs, 4inputs of cases; enable conv3x3 with group; fix buffer opencl concat; clean and clear cmake of opencl kernels. test=develop

* [LITE][XPU] fuse q/k/v in multi_encoder

* test=develop, test=xpu

* test=develop, test=xpu