* add variadic_args kernel in pten

* merge develop code

* add variadic_args kernel and benchmark

* change dynamic_cast to static_cast for DeviceContext

* merge the code

* modify code format

* refactor variadic kernel function

* fix reduce_max bug

* add unittest

* allow ifelse return `int` in paddle cond

* add test and refine code

* polish code, add test

* code format

* dist matmul op compatible

* dist op unittest

* modify dist matmul

* modify dist reshape

* modify dist reshape

* add a space

* add a space

* delete dist matmul op

* modify reshape

* add dist op unittest

* modify dist op unittest

* promote to v2

* alter

* fix

* modify log

* fix batch_size

* remove outer comment when dy2stat

* remove all comment

* add unit test

* add alias kernel name

* modify code as suggestions

* add alias name for matmul and remove redundant member in kernel factory

* add as_complex and as_real op

* dist matmul op compatible

* modify common dist op

* modify common

* add a space

* add fc_elementwise_layernorm_fuse_pass

* fix name conflictn

* rebuild CI

* fix Ran Programs=0 bug

* Support sub graph quant-post

* refine the kernel register impl

* fix cmake and symbol error

* remove overload marco

* polish details

* merge latest develop branch

* fix bugs

* update

* fix bugs for unittest

* modify for less use of gpu mem

* fix bugs of using _reset_grad_inplace_version

* update

* update

* modify for CI-Coverage

* retrick all CIs

* add transpose_flatten_concat pass

* modify skip func to ignore_pass_case func

* delete input_shape limit

* modify get node order

* default accessor and multi table config

* add unittest

* add unittest

* delete print

* fix_ele_convert: IElementWiseLayer can broadcast

* fix_ele_convert

* add alias kernel name

* modify code as suggestions

* save temp

* add unittest, test=develop

* fix ci error, test=develop

* fix grad accuracy error, test=develop

* fix unused error, test=develop

* fix compilation error on Windows, test=develop

* add unittest, test=develop

* modify by review comment and add lerp_

* fix inplace api, test=develop

* fix inplace api, test=develop

* fix coverage error, test=develop

* add update func of auto search

* update unitest

* refine a test case, test=develop

* publish python c api for eager, test=develop

* revert modify about test_allclose_layer.py, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* delete numpy includes, use pybind11 numpy.h, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* suport eager error msg, and add grad test case, test=develop

* refine, test=develop

* refine, test=develop

* generate eager core ops, only 4 ops, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* add maxunpool2d in __all__

* fix MaxUnPool2D example

* Debug

* Fixed issue with reset_grad_inplace_version when used with clear_gradient & cross-batch accumulation

* Rearranged interfaces

* Fixed ci issues

* update logsumexp doc

* update api doc

* update api doc