* add Tensor concept introduction

* add Tensor concept introduction

* add Tensor concept introduction

* add Tensor concept introduction

* add Tensor concept introduction

* fix example code

* Update paddle/metrics

* Fix format

* Update Metric format

* update hapi Model doc

* add summary

* mv Model_cn.rst to model dir

* fix hapi test=develop

* fix_model test=develop

* fix gen_doc test=develop

* fix alias_mapping

* fix_gen_doc test=develop

* fix hapi test=develop

* fix model test=develop

* add formula for entropy and kl-divergence

* fix formula in cn doc

* fix formula for Normal

* add paddle.io. test=develop

* fix indent. test=develop

* remove alias test=develop

* remove api_attr

* add_apis_and_fix_alias

* fix code bugs

* fix___init_bug

* fix migration guide

* add api_reference test=develop

* fix style test=develop

* change faq to chinese test=develop

* add release note en

* fix release note test=develop

* fix api_reference test=develop

* fix style test=develop

* add paddle.vision.transforms.* api cn doc

* add alias for paddle.vision.transforms

* delete invalid file

* add some empty doc file for rd

* delete some text alias

* change some doc path

* add some hapi cn docs

* add paddle.vision.transforms.* api cn doc

* add alias for paddle.vision.transforms

* delete invalid file

* add some empty doc file for rd

* delete some text alias

* add paddle.vision.transforms.* api cn doc

* add alias for paddle.vision.transforms

* delete invalid file

updata norm doc

* update configs & 2.0 examples

* move apis directory

* update api names

* refine doc of stack

* update paddle api

* fix typo

* fix doc

* fix sample code

* fix code-block

* add program api & update example

* replace correct jit.save/load

* update program api example

* refind rand, randn, standard_normal, normal, randint, randperm docs

test=develop

* test=develop

* polish load and saveloadconfig doc

* adjust alias

* fix index test=develop

* fix some api index test=develop
Co-authored-by: NTC.Long <chenlong@TCLongdeMacBook-Pro.local>

add the doc for the logic ops, add the broadcasting ops

* add float16 dtype, test=develop

* add type for unique

* add unique doc