* fix layers. ==> fluid.layers. (#688)

* fix data_reader_cn and dataset_cn (#685)

* fix textual content

* fix issue #682 3 3.2

* fix issues in conv

* Fix io_cn (#597)

* routine bug fix

* update text info

* fix io_cn all

* 持久性变量=>长期变量

* 1220 improve cnapi (#509)

* 1220 update cnapi

* Apply suggestions from code review
Co-Authored-By: Nhaowang101779990 <31058429+haowang101779990@users.noreply.github.com>

* refine reader doc (#686)

* update VisualDL README to add more details (#694)

* improve save_load_variables cn (#689)

* improve save_load_variables

* Update save_load_variables.rst

* fix typo of models (#698)

* fix typo of models

* fix en

* Fix arguments according to 1.3 en + ceil,floor 翻译 +operator 翻译 (#695)

* Fix arguments according to 1.3 en + ceil,floor trans +operator trans

* fix LoDTensorArray spell

* update_reading_data (#699)

* add api_guides low_level backward parameter program_en (#696)

* add api_guides low_level backward parameter program_en

* Apply suggestions from code review
Co-Authored-By: Nzy0531 <48094155+zy0531@users.noreply.github.com>

* Apply suggestions from code review
Co-Authored-By: Nzy0531 <48094155+zy0531@users.noreply.github.com>

* Update backward_en.rst

* Update parameter_en.rst

* Update program_en.rst

* Update doc/fluid/api_guides/low_level/program_en.rst

* learning_rate_modifier_en

* Review

* File path

* pooling_en

* Review

* File path

* detection_en

* Review

* file path

* data_feeder_en

* Review

* file path

* upload activationsen.rst

* Update activationsen.rst

* Update activationsen.rst

* Review

* file path

* upload async_trainingen.rst

* Review

* upload cpu_train_best_practiceen.rst

* Review

* upload large_scale_sparse_feature_trainingen.rst

* Review

* sparse_update_en

* Review

* file path review x2

* conv_en

* Review

* Review

* optimizer_en

* Review

* file path

* tensor_en

* Review

* file path

* executor_en

* Review

* file path+review x2

* model_save_reader_en

* Review

* delete redundant

* inference_en

* Review

* upload sync_trainingen.rst

* Update sync_trainingen.rst

* Update sync_trainingen.rst

* Review

* upload mathen.rst

* Update mathen.rst

* Review

* file path

* upload /sequenceen.rst

* Review

* file path fix

* data_in_out_en

* Review

* Correct file path

* delete redundant

* upload cluster_train_data_en.rst

* Review

* polish

* control_flow_en_loss_function_en_metric_en

* Review x3

* upload memory_optimize_en.rst

* Review

* fix jargon

* Fix memory ==> video memory

* upload parallel_executor_en.rst

* Review

* Redundant

* Change api guides directory

* fix wrong ref

* Update memory_optimize.rst