* polish printing dtype

* fix special case

post quantize support insert fake_quantize_dequantize node before the OPs that will be used in VIS's faceid models (#30659)

test=develop

* test=develop, fix test_lookahead

* add abs test case

* use std::abs to fix abs bug

* fix the abs bug

* fix abs bug

* Fix the bug in fleet amp_init.

* Fix the amp_init unit test.

* update document of paddle.vision.dataset, test=document

* update document of paddle.vision.dataset, test=document

* Fix the error of save_quantized_model

* support reduce_max op on kunlun

* support reduce_max op on kunlun

* support reduce_max op on kunlun

* support reduce_max op on kunlun

* delay the 'timeout' of 'test_static_save_load'.

* delay the 'timeout' of 'test_static_save_load'.

* rewrite abs op

* rewrite abs op and remove abs in activation

* remove abs register in old codes

* fix abs_grad type error

* fix abs double_grad output name error

* modify abs_grad, abs_grad_grad functor for windows building

* format code style

* fix the bug of result is nan when the divisor is zero

* add missing abs attr and add abs for float16

* add fleet amp.init()

* add unittest for fleet_amp_init

* delete empty line of pybing.cc, test=develop

* fix layers train eval bug, test=develop

* update, test=develop

* add paddle.

* add unittest

* add trainers for pserver

Change-Id: I1a75793ec81ce126d07f4c47cae09b95d530bbc8

* add rmsprop_op_xpu test=kunlun

* modified rmsprop_op_xpu error code. test=kunlun

* support layer_norm fp16 in dygraph amp

* add ut

* refine code

* add 2.0 API: device_guard

Fix potential port conflicts

* Avoid  bug on 'MAC python3.5/6'.

* Choose the saving method according to the OS.

* smaller length of '_unpack_saved_dict' for MAC OS.

* add version information of Python.

* Edit comment.

* Collect weight threshold of lstm, test=develop

* Modify the calculation logic of LambOptimizer