* add complex real op & api & unittest

* add imag op & api & unittest

* refactor op impl

* revert simplify writing due to complile failed

* polish details

* polish grad op code

As the title

* remove addcmul

* remove unittest and other related code of addcmul

* fix bug

* fix merge conflict

* rm complexvariable

* modify test_var_base unittest

* remove duplicated codes

* enhance array_to_lod_tensor_op lod_tensor_to_array_op errors information. test=develop

* fix format. test=develop

* format fix. test=develop

* add lod_rank_table. test=develop

* fix format. test=develop

* fix doc info. test=develop

* fix np error

* add unbind dygraph api. test=develop

* fix unbind doc.test=develop

* basic impl of type promote

* add comment & another testcase

* fix complex bugs & support python op promote type

* fix failed unittests & polish code

* add unittest for coverage

* change to only promote complex type

* polish code details

* polish several comments

As the title

update expand as op to use the shape of the target tensor instead of the target tensor itself. (#29020)

* update, test=develop

add paddle.subtract, optimize paddle.maximum and paddle.minimum 

* fix doc example, test=develop, test=document_fix

* fix Categorical en doc

* fix doc for apis

* remove numpy in sample code

* update, test=develop

Fix ops doc for some ops 

Simple code clean up

As the title

* upgrade comment string to raw string

* fix string in

* fix string with ' '

* revert update on comments

* upgrade only necessary

* fix sample code checker

* fix comments with '''

* refine doc of bernoulli

* fix some problems

* fix unsqueeze

* fix squeeze

* fix doc

* Fix wrong out dtype from helper.input_dtype

* add unittest

* remove disable_static in op_test

* fix param name typo

Add new operator log10

* Fix two english api documents, transpose and strided_slice

* delete nouse comments

faster the compare ops dygraph model speed 

* fix output dtyp inconsistent with input

* refine code

also fix `no_grad` alias

As the title

fix the add_n english doc

1. Remove 'fluid';
2. Variable -> Tensor

APIs:
 sum, convert_call, convert_ifelse,
 convert_logical_and, convert_logical_or, convert_logical_not