add fill_ backward

* Add empty_cache api to release idle gpu memory hold by allocator,test=develop

* Add empty_cache api to release idle gpu memory hold by allocator,test=develop

* Add empty_cache api to release idle gpu memory hold by allocator,test=develop

* Fix test coverage problem for empty_cache

* delete redundant check for empty_cache

* fix the problem of empty_cache's doc

* delete the nvidia-smi comment in doc of empty_cache, test=document_fix

Revert "Implement FunctionTraits to support two kinds of elementwise functor and remove some old codes for broadcast. (#35487)" (#35686)

* fix interpolate launch error, test=develop

* fix area mode for interp, test=develop

Implement FunctionTraits to support two kinds of elementwise functor and remove some old codes for broadcast. (#35487)

* reshape support zero-input

* add unitest

* revise error message

* upload global scatter and global gather operators related files

* fix github name

* fix CI error

* fix review and CI error

* fix inf,nan error and modify unittest samples

* add unittest samples

* add unittest samples

* fix unittest error

* test=document_fix

* test=document_fix

* modify doc and add unittest samples

* fix error newline in constant

* modify doc after mentor review

* modify __all__ and doc

* modify doc

* [ROCM] fix top_k_v2 with large shape

* [ROCM] fix top_k_v2 with large shape

* implemented clip op bf16/fp32

* added skipping if not cpu or bf16

* CI rerun after bf16 package change

* added parentheses to ensure formatting

* refactor gc, test=develop

* refine, test=develop

* refine, test=develop

* refine, test=develop

* gc each tensor, test=develop

* refine, test=develop

* change metaclass of Layer from pybind11_builtins.pybind11_type to type

* fix cast

* add ut

* add test_cumprod_op

* Revert "add test_cumprod_op"

This reverts commit c96cf6dff5d09ae7d8cc72c1e8ae4369a153aa19.

* recommit

* add error message

* test input(x) initialize

* test use cpu

* update test code

* add test type

* add test case

* solve ci problem

* add complex case test

* add complex case test

* fix review problem

* fix conflict

* fix some docs

* change test case

* change test case

* fix review problems again

* fix docs

* fix inclusivescan bug

This PR supports gradient clip (ClipGradByGlobalNorm) when training with AMP(auto mixed precision).

* import ska flat_hash_map

* add define NOMINMAX macro to fix windows build failed bug

* add brackets to std::max in flat_hash_map

* move flat_hash_map directions

* modify namespace to paddle

* modify namespace to paddle

* modify namespace to paddle

* modify namespace to paddle

* rm not used map.h and replace with op_info

* add as_extra to dropout op and lrn op

* refine details

* fix dropout op maker

* fix extra op for expand, expand_as, tile, unstack

* Update expand_v2_op.cc

* fix bn/in/squeeze/syncbn extra

* update bn

* update

* update