* 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

* remove v2

* remove mobile

* check_1.3_api_update

* add launch mp distributed job

* fix comment

* update by comment

1. add index for all English version of "进阶使用"
2. replace legacy softlinks to howto/optimization & dev/new_op_en with original file

add gpu support

Remove paddle.v2

* host_memo_profile

* Update host_memory_profiling_en.md

* Review

test=develop

* upload write_docs_en.md

* Textual Review

* fix link ref

* upload op_notesen

* Review

* review2

* upload new_op_en.md

* Review

* Review2

* mobile_build_en

* Review

* mobile_readme_en

* Update mobile_readme_en.md

* Review

* Review

* remove v2

* remove mobile

* fix_02

* windows_cpp_inference_en

* Update windows_cpp_inference_en.md

* Review

* paddle_gpu_benchmark_en

* Update paddle_gpu_benchmark_en.md

* Review

* review2

* paddle_tensorrt_infer_en

* Update paddle_tensorrt_infer_en.md

* Review

* native_infer_en

* Update native_infer_en.md

* Review

* review2

* build_and_install_lib_en

* Update build_and_install_lib_en.rst

* Review

Fix reader.md doc

update inference doc (analysis predictor and  trt int8) for 1.3

* upload fluid_design_ideaen.md

* review

* remove redundant files

- delete the Models index in root index
- update models/index_en.rst

* py_reader_en

* Textual Check

* test_while_training

* Textual Review

Textual Fix

* single_node

* Textual Fix

* review on webpage