* add singleton to custom device

* Update custom_device.cc

Init device_init_flag_ in default

* [CustomDevice] add to_static, amp ut

* update

* fix failed ut

* update

* [CodeStyle] remove all future import

* revert test_error.py

* restore future import in example code

uniform logger manager in FleetAPI.
hidde API under distributed/utils which users don't need.

* unify  core_avx and core_noavx

* fix except error

* revert mac compile logic

* revert dylib to so

* add core_noavx branch

* remove core_noavx

* replace paddle_core by lib paddle

* polish var name

* replace paddle_core by libpaddle

* update custom device commit

* polish code by comments

* [CustomDevice] unittests tracking the fixed version plugin

* update

* [CustomDevice] add profiler apis

* migrate CalculateEstOccupancy into cuda_tracer

* update

* add ut

[CodeStyle] use np.testing.assert_array_equal instead of self.assertTrue(np.array_equal(...)) (#44947)

* automatically fix

* update comments

* numpy -> np

* self.assertEqual(..., True)

* wrong usage (err_msg=True)

这不是修复导致的错误，这些是原来 `self.assertTrue(..., True)`
的错误用法，因此在修复后将其认为位置参数 `err_msg`

* some missing fix

* [CustomDevice] add custom ccl 2/2

* update

* update

* update launch

* add FLAGS_enable_api_kernel_fallback

* deal with more cases

* add ut for coverage

* [CustomDevice] add process_group_xccl ut

* update

* [CustomDevice] register Copy for custom device

* [CustomDevice] register Copy for custom device

* [CustomDevice] register Copy for custom device

* merge and add uts

* merge and add uts

* fix for blocking and unittests coverage

* [Plugin] Fix Custom device in eager mode, test=develop

* update test case, test=develop

* update ut for coverage, test=develop

* [CustomKernel] add capi eager mode support

* add ut

* add capi test

* Dataloader add custom device support

* update test=document_fix