* support CUDAGraph for partial graph

* add ut

* fix ci

* fix ut again because of eager mode

* fix kunlun ci

* fix win ci

* Support memory stats for CPU

* Add UTs

* Fix typos

* Fix typos

Add new APIs for GPU memory monitoring (max_memory_allocated, max_memory_reserved, memory_allocated, memory_reserved) (#38657)

* Add new API memory_reserved

* Add memory_allocated, max_memory_reserved and max_memory_allocater

* Fix CI error

* Fix CI error

* Enhance UT

* Add FLAGS_memory_stats_opt

* Add STATS macro functions

* Add StatAllocator

* Fix CI errors

* Add UT

* Fix CI errors

* try to fix CUDA Graph H2D copy bug

* remove useless code

* fix ci

* fix ROCM CI

* fix CUDA_VERSION

* improve CI coverage

* add basic support for CUDA Graph

* fix ci compile error

* fix LOG print, fix windows CI

* follow comments and update

* small fix for default ctor

* fix rocm compile error

* fix CPU compile error

* add op paddle.device.cuda.get_device_name

* fix some bugs

* fix some bugs

* fix error message bugs

* fix en docs

* fix bugs

* fix bugs

* fix bugs

* add error message test case

* add get_device_name and get_device_capability

* fix review

* fix docs bug

* fix docs

* fix docs

* Initial Commit

* add unittest and add error information

* modify doc

* fix some error

* fix some word

* fix bug cudaDeviceProp* and modify error explanation

* fix cudaDeviceProp* error and unnitest samples

* fix hip error and PADDLE_WITH_HIP

* update style

* fix error is_compiled_with_cuda

* fix paddle.device.cuda.get_device_properties

* fix error for multi thread safe

* update style

* merge conflict

* modify after mentor review

* update style

* delete word

* fix unittest error for windows

* support string input and modify some code

* modify doc to support string input

* fix error for express information

* fix error for express information

* fix unnitest for windows

* fix device.startswith('gpu:')

* format error and doc

* fix after review

* format code

* fix error for doc compile

* fix error for doc compile

* fix error for doc compile

* fix error for doc compile

* fix error for doc compile

* fix py2 error

* fix wrong words and doc

* fix _gpuDeviceProperties

* test=document_fix

* Initial Commit

* add unittest and add error information

* modify doc

* fix some error

* fix some word

* fix bug cudaDeviceProp* and modify error explanation

* fix cudaDeviceProp* error and unnitest samples

* fix hip error and PADDLE_WITH_HIP

* update style

* fix error is_compiled_with_cuda

* fix paddle.device.cuda.get_device_properties

* fix error for multi thread safe

* update style

* merge conflict

* modify after mentor review

* update style

* delete word

* fix unittest error for windows

* support string input and modify some code

* modify doc to support string input

* fix error for express information

* fix error for express information

* fix unnitest for windows

* fix device.startswith('gpu:')

* format error and doc

* fix after review

* format code

* fix error for doc compile

* fix error for doc compile

* fix error for doc compile

* fix error for doc compile

* fix error for doc compile

* fix py2 error

* fix wrong words and doc

* fix _gpuDeviceProperties

Fix docs in stream_guard API 

Add paddle.cuda.device.stream_guard API 

* 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

* Add cuda device count api

* update coda format

* fix unittest error

* update code format

* update comment

* add cuda event and stream api

* add cuda event and stream api

* add get_current_stream api

* add get_current_stream api

* init streams

* modify get_current_stream

* modify get_cuttent_stream

* add synchronize func

* add current_stream doc and test file

* move get_current_stream into CUDA macro

* move CudaEvent into CUDA macro

* move _get_current_stream and _device_synchronize into cuda macro

* modify the macro of cuda stream and event

* add test case for synchronize

* add paddle.devices.cuda module

* event and stream support hip

* add doc for stream and event class

* move cuda stream and event into single pybind

* add cuda_streams_py.cc to cmakelist

* add _device_synchronize and _get_current_stream to core module

* add test case for cudastream and cudaevent

* move __all__ in streams.py

* fix test fail

* add cuda to devices __all__

* fix current_stream doc writing error

* move devices to device direction, and merge device.py into __init__.py

* add required:gpu to sample codes

* remove cuda direction from device/__init__.py