add act grad ops

* fix ttfnet miscs. test=develop

* fix conv int8 kernel choose and sooftmax compute bug

* change axis_size = 4 kernel choose, test=develop

* fix format. test=develop

* fix: winograd support unsame pad
test=develop

* feat: add winograd int8 kernel
test=develop

* fix: style fix
test=develo

* fix winograd_int8 ut sgement default. test=develop

* close basic_test, test=develop
Co-authored-by: NMyPandaShaoxiang <txg4794@163.com>

* add grouup_norm

* fix format. test=develop

* fix xiaodu crash. test=develop

* fix pooling overflow, test=develop

* fix conflict test=develop

int8 direct_conv, dw_conv add relu6 and leaky relu fusion

* improve 3x3s1 direct profile

* add gemv+relu6/lleakyRelu

* fix relu6 problem, test=develop

* fix format, test=develop

* add six / scale , test=develop

* reduce .so size. test=develop

* compile all targets when LITE_ON_TINY_PUBLISH=OFF

* unordered_map is more convenient when key is customized class

* test=develop

* fix pooling bug and speed

* add 2x2s2p1 pooling. test=develop

* fix conflict, test=develop

* add scale+relu/relu6/leakyrelu test=develop
* fix format， test=develop

*Pool2d supports adaptive param

improve sgemm performance on A53

* Add hard_swish, ctc_align and reciprocal op, test=develop
* Move some activation ops to extra, test=develop

* fxi ff, test=develop

* delete bgr_flip, test=develop

* [LITE][OPENCL] Change fp32 fc to fp16's. test=develop

* fix act in conv3x3opt opencl kernel. test=develop

* [LITE][ARM] comment assembly of layout armv7 cpu. test=develop

* add backend

* add kernel

* add grad kernel

* improve conv_dw profile with rel relu6 leakyrelu, test=develop

* add depthwise, test=develop

* fix ci error, test=develop

* fix cv demo print, test=develop

* [ARM] improve sgemm performance with relu, relu6 and leakey relu, test=develop

* [ARM] improve sgemm performance with relu, relu6 and leakey relu, test=develop

* fix clang v7 error
* change ut, test=develop
* fix conv ut, test=develop

* set arm_lang default is off. test=develop

* fix resize error, test-develop

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

* scale support int32 input

* 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

* add sequence_conv op and arm kernel

* add test, test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* modify code style. test=develop

* fix ut, test=develop

* delete unused code, test=develop

* feat: add lstm op && kernel
      test=develop

* Support lac model, fix bug for argmax lod_reset, test=develop

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