update directory structure

doc/fluid/advanced_usage/development/cpu_profiling_cn.md

-../../howto/optimization/cpu_profiling_cn.md
\ No newline at end of file

doc/fluid/advanced_usage/development/host_memory_profiling_cn.md

-../../howto/optimization/host_memory_profiling_cn.md
\ No newline at end of file

doc/fluid/advanced_usage/development/profiling/cpu_profiling_cn.md

+../../../howto/optimization/cpu_profiling_cn.md
\ No newline at end of file

doc/fluid/advanced_usage/development/profiling/host_memory_profiling_cn.md

+../../../howto/optimization/host_memory_profiling_cn.md
\ No newline at end of file

doc/fluid/advanced_usage/development/profiling/index.rst

+##########
+性能调优
+##########
+..  toctree::
+    
+    benchmark.rst
+    cpu_profiling_cn.md
+    gpu_profiling_cn.rst
+    host_memory_profiling_cn.md
+    timeline_cn.md

doc/fluid/advanced_usage/development/profiling/timeline_cn.md

+../../../howto/optimization/timeline_cn.md
\ No newline at end of file

doc/fluid/advanced_usage/development/timeline_cn.md

-../../howto/optimization/timeline_cn.md
\ No newline at end of file

doc/fluid/advanced_usage/index.rst

@@ -15,8 +15,4 @@
     development/contribute_to_paddle.md
     development/write_docs.rst
     development/new_op.md
-    development/cpu_profiling_cn.md
-    development/gpu_profiling_cn.rst
-    development/host_memory_profiling_cn.md
-    development/timeline_cn.md
-    benchmark.rst
+    development/profiling/index.rst

doc/fluid/beginners_guide/programming_guide/programming_guide.md

 
-# Paddle Fluid编程指南
+# Fluid编程指南
 
 本文档将指导您如何用Fluid API编程并搭建一个简单的神经网络。阅读完本文档，您将掌握：
 

doc/fluid/howto/optimization/timeline_cn.md

-# 如何使用timeline工具做性能分析
+# timeline工具简介
 
 1. 在训练的主循环外加上`profiler.start_profiler(...)`和`profiler.stop_profiler(...)`。运行之后，代码会在`/tmp/profile`目录下生成一个profile的记录文件。
 

doc/fluid/index_cn.rst

@@ -13,5 +13,4 @@
     beginners_guide/index.rst
     user_guides/index.rst
     advanced_usage/index.rst
-    faq/index_cn.rst
     api_guides/index_cn.rst

doc/fluid/user_guides/design_idea/fluid_design_idea.md

-# Paddle Fluid设计思想
+# Fluid设计思想
 
 ## 简介
 

doc/fluid/user_guides/howto/debug/visualdl.md → doc/fluid/user_guides/howto/evaluation_and_debugging/debug/visualdl.md

-# VisualDL (Visualize the Deep Learning)
+# Visual DL工具
 <p align="center">
   <img src="https://raw.githubusercontent.com/PaddlePaddle/VisualDL/develop/docs/images/vs-logo.png" width="60%" />
 </p>

doc/fluid/user_guides/howto/evaluation_and_debugging/index.rst

+###############
+模型评估/调试
+###############
+
+..  toctree::
+    :maxdepth: 2
+
+    evaluation/metrics.rst
+    debug/visualdl.md

doc/fluid/user_guides/index.rst

@@ -13,8 +13,7 @@
     howto/prepare_data/index
     howto/configure_simple_model/index
     howto/training/index
-    howto/debug/index
-    howto/evaluation/index
+    howto/evaluation_and_debugging/index
     howto/inference/index
     models/index.rst
     design_idea/fluid_design_idea.md