* add xpu resnet_unit
*test=kunlun

* tmp
*test=kunlun

* update xccl lib
    * use separate streams for compute/comm on XPU
    * add broadcast op to xpu2_op_list

* build into one static library

* move memory/detail to memory/allocation

* fix bug

* fix profiler

* fix framework_proto

* fix deps

* fix inference compilation

* fix rocm compile

* follow comments

* fix buddy_allocator_test

* Compilation optimization

* adapt mkldnn kernel in PHI

* fix ci compile bugs

* fix compile bugs

* fix compile bugs

* fix compile bugs

* fix compile bugs

* delete comment

* fix compile bugs in windows-inference

* delete code for converage

* modify code by review

* modify code by review

* add todo

* fix compile bugs

* fix compile bugs

* fix compile bugs

* fix unittest bugsx

* [CustomDevice] add custom ccl api

* add ut

* add relu6 and relu6_grad

* change code style of relu6 and relu6_grad

* add relu6 and relu6_grad *test=kunlun

* add relu6 and relu6_grad *test=kunlun

* fix cpu lars_momentum bug & add xpu grad_add/log_softmax/log_softmax_grad
*test=kunlun

* minor
*test=kunlun

* grid sampler op for xpu. test=kunlun

* update relu xdnn api. test=kunlun.

* add authors
Co-authored-by: NAllen Guo <alleng@graphcore.ai>
Co-authored-by: NZhixin Yao <zhixiny@graphcore.ai>
Co-authored-by: NZhaorui Chen <zhaoruic@graphcore.ai>

* squash cpp changes 2/N
Co-authored-by: NZhixin Yao <zhixiny@graphcore.ai>
Co-authored-by: NZhaorui Chen <zhaoruic@graphcore.ai>

* add authors
Co-authored-by: NAllen Guo <alleng@graphcore.ai>
Co-authored-by: NZhixin Yao <zhixiny@graphcore.ai>
Co-authored-by: NZhaorui Chen <zhaoruic@graphcore.ai>

* squash cpp changes 1/N

* clean code
Co-authored-by: NZhixin Yao <zhixiny@graphcore.ai>
Co-authored-by: NZhaorui Chen <zhaoruic@graphcore.ai>

* reduce redundancy

* python code style

* fix int8 ut

* rmsprop for xpu. test=kunlun

* minor fix (follow comments). test=kunlun

* feat(): dynamic_to_static support for ipu.

* fix(): format fix.

* fix format

* fix cpplint error

* use phi::errors

* fix format

* fix format

* fix(): add api to restore patched function.

* fix(): identity_loss uses cpu place as expected kernel type.

* doc(): add IPU dy2static related docs.

* fix(): combine test cases.

* fix format

* fix comment

* fix format

* apply comment

* fix compiling

* fix(): align docs.

* fix(): fix identity_loss function docs.

* fix(): adjust mean and sum in identity_loss.

* fix(): minor docs.

* move API to paddle.incubate.identity_loss

* fix UT
Co-authored-by: Nzhaorui chen <zhaoruic@graphcore.ai>

* fix for binary kernels

* fixed performance for elementwise, reduce and concat

* added comment

* CI fix

* CI fix

* added formatting

* reverted one file

* Revert "reverted one file"

This reverts commit 54725e1c62318d3a18913821200e973816751019.

* Revert "added formatting"

This reverts commit b9795dd253d755a329376d7ab0542860aa7815c6.

* added enforcing oneDNN BF16 reduce kernel

* fix for eltwise and reenabled reshape kernels

* fix for binary handler

* added formatting

* referted changes for flatten,squeeze and reshape ops

* - blind shot fix

* - workaround

* - compilation fix

* - Hack

* fix init()

* delete test_device_context

* replace CPUDeviceContext with CPUContext

* fix test_scalar

* remove dot_op.cc

* fix compile

* unify cpu context

* fix init()

* delete test_device_context

* fix test_scalar

* add code

* add unit test