* move elementwise function to funcs directory

* fix compile bugs

* modify according to comment

* immigrate_transpose_to_pten cpu kernel only; test=develop

* fix bug; test=develop

* add transpose cuda api

* bug fix;

* fix bugs

* fix bugs; test=develop

* bug fix;

* move transepose to pten; test=develop

* fix bug; test=develop

* fix bugs; test=develop

* add transpose grad fp16 support; test=develop

* fix bug; test=develop

* fix npu bug; test=develop

* fix nemul = 0 bug; test=develop

* add fp16 support; test=develop

* fix data type register bug; test=develop

* fix transpose bug; test=develop

* update transpose

* fix transpose bug; test=develop

* remove useless code; test=develop

* remove useless code; test=develop

* fix transpose alias bug; test=develop

* polish code; test=develop

* resolve confict; test=develop

* resolve confilct; test=develop

* recover prepared operator; test=develop

* fix bug; test=develop

* polish code; test=develop

* fix bug; test=develop

* fix bug; test=develop

* Move BroadcastTensors OP to phi

* Remove mutable_data in impl

* Move BilinearTensorProductInferMeta to multiary.h/cc

* unify complex type trait and fix real imag bug

* add unittest for type tratis

* tranfer the selu_op and pass the CI

* add sig files

* fix code

* fix by code review

* remove TOOD

* change the include position

* change the head position

* remove empty kernel in fluid and adjust the param of empty dev_api

* polish code

* revert fluid empty kernel

* fix selected_rows bug in C++ API

* add optional for C++ APIO

* data transform support optional

* remove data transform for optional vector<Tensor>

* adjust some format of funtcion

* fix empyt bug

* remove SetAllocationForOutputTenosr

* add place param for copy kernel

* recover SetAllocationForOutputTenosr

* polish code

* fix empty_dev api bug

* test=allcases

* test=allcases

* fix bug

* recover empty

* recover modify

* Move GumbelSoftmax OP to phi

* platform::errors -> phi::errors; GumbelSoftmaxGradInferMeta -> backend.h/cc

* Use axis util in kernel impl

* Remove namespace platform::errors

* Use GetCPUEngine in Device Context

* Move BilinearTensorProduct OP to phi

* Set dtype for Infermeta

* move eye OP to pten

* move size OP to pten

* merge develop

* fix merge

* move files

* move erfinv OP to phi

* remove comment

* move pixel_shuffle OP to phi

* remove comment

* fix PT_REGISTER

* fix NPU

* fix CR

* remove size_sig.cc for PR-CI-Coverage

[Phi] mv kernel 

* refine randint kernel

* refine randperm kernel

* refine unbind kernel

* support op seed

* support cudnn kernel moving

* polish cmake rules

* add unittest for coverage

* remove orig kernel

* remove softmax cudnn kernel

* fix softmax test failed

* fix npu func error

* resolve conflict

* rename gpu dnn kernels

* fix name rule error

* fix compile error

* update fp16 namespace

* migrate increment addmm multinomial cholesky kernels to phi

* test pr39869

* test pr39869

* fix style and ci

* move cross forward OP

* move cross grad op to phi

* move infershape

* refine infershape

* rename ctx

* set dtype and layout in InferMeta

* refine code

* Migrate poisson op into phi

* fix CI

* fix comment

* Optimize the where_op by the elementwise_op funtion

* Modified where_op & abs_grad_op by elementwise interface

* move unbind to phi

* revert infer shape

* add header file

* move concat_and_split to phi

* Move Real OP to phi

* Move Imag OP to phi

* Move Real and Imag InferShape to phi

* Move Real and Imag to complex_kernel

* Change PT_REGISTER_XXX to PD_REGISTER_XXX

* change Vector to std::vector and provide MixVector class as a helper wrapper class

* solve the multi-gpu hang problem

* remove the duplicate template instantialize

* Copy vector to cpu

* add CopyToCPU

* xxx

* final version: fix the problem of all reduce

* remove mixvector dependence

* fix

* merge

* fix code

* fix by CI

* [Phi] Migrate unfold_op into phi

* fix im2col CPUContext template instantial

* fix unfold_op.h header include problem

* fix unittest

* fix PT->PD

* migrate huber_loss into phi

* migrate infershape

* modify pten into 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