* move gather_scatter_kernel from fluid to phi

* mv gather_scatter_kernel to gather_scatter_functor

* move maxouting from fluid to phi

* move matrix_bit_code from fluid to phi

* replace mutable_data and fix include

* fix include

* move gather_scatter_kernel from fluid to phi

* Revert "move gather_scatter_kernel from fluid to phi"

This reverts commit 3d0b1eaf179656072e8c483dfca688cccccdda01.

* decouple im2col from fluid

* move im2col to phi

* fix build error

* delete redundant comment

* move vol2col from fluid to phi

* update copyright year

* move cross_entropy from fluid to phi

* replace mutable_data with Alloc

* use .template

* cleanup unused code

* unify is_int8 is_bfloat16

* Simplify matmul_v2 FWD kernel

* remove RunKernel methods

* remove import namespace

* remove headers

* clean fluid/phi cross imports

* remove fluid axpy_handler

* delete fluid methods

* activations

* OneDNNMemDesc

* MKLDNNFormatForSize

* MatchShapeToLayout

* MKLDNNMemoryFormat

* MKLDNNFormat

* ReorderMKLDNNHandler

* to_void_cast

* review suggestions

* interpolate

* remove fluid depedency

* remove fluid kernel and activate phi kernel

* fix parameter error

* transfer mkldnn part

* modify header file path

* fix compile error

* transfer special case

* fix lod setting and special case for layout setting

* add testcase and refine code

* make tensor_util contains no cuda code

* refine isfinite

* revert ut

* move isfinite function to its op

* fix test

* fix compile

* std::isnan is not defined for int type on windows

* fix windows compile

* fix fp16

* fix rocm compile

* revert gradient node

* move fft kernels to phi, done with cufft, pocketfft, mkl_cdft, hipfft
* make stft_op use fft from phi/kernels/funcs, clean code

* add cmake enforce

* transfer multiclass_nms3  to phi

* [Phi] Migrate matrix_solve to phi

* replace mutable_data with Alloc

* move deformable_conv_grad to phi

* move infershape of deformable_conv to phi

* adjust some code format

* move deformable_conv_v1 to phi

* Move Pool OPs to phi

* Fix CI error

* Fix conflicts

* move segment_pool to phi.

* mark summed ids as optional tensor.

* fix as reviews.

* move matrix inverse into phi

* change license year

* Migrate triangular_solve op into phi

* fix CI

* move MatrixReduceSum to phi funcs

* move MatrixReduceSum to phi funcs

* fix comment

* fic CI

* move sequence2batch

* move lstm and gru

* Add phi/kernels directory into exclusion to stop using hipcc to compile non .cu files in it.

* move unbind to phi

* revert infer shape

* add header file

* move concat_and_split to phi

* rename pten dir to phi

* rename namespace to phi

* rename infrt pten dir to phi

* resolve conflict

* rename pten to phi in cmake

* revert all infrt change

* change needed files

* fix infrt failed

* fix inference failed

* move blas related files
* move lapack related files

* clean useless header in pten core

* fix compiled failed

* fix cmake target

* fix typo

* resolve conflict

* move operators/math/math_function_* to pten/kernels/func
* namespace from `paddle::operators::math` to `pten::funcs`

* remove hybird dir

* resolve conflit

* change 'math' to 'math_kernel'

* fix compile bugs

* merge develop

* fix compile bugs

* move cpu_impl of elementwise kernel to new directory

* rename cuda to gpu

* revert CMake change

* resolve conflit

* rename other cuda to gpu

* poish details

* unify device context entrance

* move all_context include to header

* polish cmake relay for device_context

* fix npu compile failed

* fix npu compile failed

* add pten reduce kernel

* add reduce_sum kernel

* update attribute args and order

* make out dtype undefined

* fix empty input error

* merge develop branch

* rename sum as reduce function

* rename sum as reduce function

* fix reducekernelImpl args error

* add reduce cuda kernel

* modify dims type to const &

* remove unsed log

* fix reduce_all out eigen function error

* remove unused codes

* add the missing sum api define and testcase

* merge develop branch

* fix sum test axis value error

* replace pten mean kernel with reduce_mean

* revcover meam cuda to original implement