* doc of paddle.save/load

* polish doc of paddle.save/load

* fix two error message

* fix two error message

* fix error

* fix error

* fix error

* fix error

* fix some error message

* fix some error

* fix error

* fix some error

* fix some error

* fix some error

* fix one error

* fix some error

* fix seven error message

* fix error

* fix error

* fix error

* fix error

* fix some error message

* fix error

* fix some error

* fix some error

* fix four error message

* fix error

* fix error

use the `required` instruction to determine if the environment fits the sample code's required. (#32766)

* add unittests

* add find_last_future_line_end

* extract_code_blocks_from_docstr and its testcases

* test_codeblock_before_examples_is_ignored

* sampcd_extract_to_file 拆为两步

* update the codeblock element's format

* code-block directive has no value options

* insert the CODES_INTERTED_INTO_FRONTEND

* using the new func insert_codes_into_codeblock

* get_test_capacity and is_required_match

* using the new funcitons in sampcd_extract_to_file

* add some comments and refactor functions

* using logger instead of all the print

* remote wlist

* collect summary info, and print them

* call get capacity

* update summary format

* print the apis that don't have sample codes.

* print the samples the consumed time more than 10s.

print time

* update unittest testcases

* solve ResourceWarning: unclosed file

* run tools test seperately

* python2 does not have nonlocal keyword, using dict variable instead

* remove unused import, rearrange a series of conditional statements.

* remove wlist.json and its check approval

* remove wlist.json and its check approval

* add use_global_beta_pow

* add use_global_beta_pow

* update npu kernel

* update python api

* refine code

* add ut for use_global_beta_pow

* fix npu kernel

* add ut for api

* add ut for exception

* add ut for save/load

* fix windows CI

* fix windows CI

* Fix comments in framework

* Update framework.py

* fix dataloader exit hang when join re-enter. test=develop

* fix cpp lint
* fix save/load with unexpected value
* fix save and user interface

* add varbasecopy func to fix the paraBase type bug in layers.to API

* overload _copy_to func for ParamBase

* add xpuplace

* add waiting varbsecopy completion when not blocking

* fix dst_device bug

* modify varbase to shared_ptr

* polish test decoupled py reader

* remove bin file

* fix retry in download when exception occurs

* fix find_unused_parameters default value