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--- a/develop/doc/_sources/design/kernel_hint_design.md.txt
+++ b/develop/doc/_sources/design/kernel_hint_design.md.txt
+## Problem
+In PaddlePaddle's [Design](https://github.com/PaddlePaddle/Paddle/blob/develop/doc/design/switch_kernel.md), one Operator may have multiple kernels. Users may have some personal preference to choose a certain type of kernel for an operator, such as `force_cpu` to choose a CPU kernel, `use_cudnn` to choose a CUDNN kernel, we need to provide a way for users to do this.
+
+In the current design, we use KernelType to describe one kernel.
+
+```cpp
+struct KernelType {
+  Place place_;
+  DataType data_type_;
+  LayoutType layout_;
+};
+```
+ `place_` `data_type_` and `layout_` can be got from the input tensors of the operator, `GetActualKernelType(inputs)` use inputs to infer the proper kernel key that fit the incoming data, but users can not directly configure it.
+
+The [design](https://github.com/PaddlePaddle/Paddle/blob/develop/doc/design/switch_kernel.md) also provides a virtual method `GetExpectedKernelType` that user can overload and use to choose the KernelType they want to use.
+
+So we should send the information user defined in proto to `GetExpectedKernelType` for choosing a kernel.
+
+The problem is, how should we define and send the information for `GetExpectedKernelType` to use?
+
+## Solution
+
+### Potential choice
+1. Do nothing, let the user add the information they want to operator‘s attribute and get them inside `GetExpectedKernelType`, this can work properly. But there is a little problem that users may define many kinds of hints for the same purpose, such as `force_cpu`, `use_cpu`, `cpu_kernel` to choose CPU kernel, and `use_cudnn`, `force_cudnn`, `cudnn_kernel` to choose CUDNN kernel.
+
+2. Pre-define all the needed option and use a single attr key such as `kernel_hint` for the user, this is not so flexible if the user wants to define some more kind of hint.
+
+### Final choice
+To provide enough flexibility while avoiding confusion definition, we can define some global constants for these attribute names, such as `force_cpu`, `use_cudnn`, `use_mkldnn` for a user to choose.
+
+In C++
+
+```cpp
+const std::string kForceCPU = "force_cpu";
+const std::string kUseCUDNN = "use_cudnn";
+const std::string kUseMKLDNN = "use_mkldnn";
+
+KernelType GetExpectedKernelType() {
+  if (Attr<bool>(kForceCPU)) {
+    return KernelType(CPUPlace, ...)
+  } else {
+    ...
+  }
+}
+```
+
+In Python code
+
+```python
+FORCE_CPU = core.kForceCPU()
+
+def xx_layer(..., force_cpu=false):
+  layer_helper = LayerHelper(...)
+  layer_helper.append_op(
+    type="xx",
+    attr={FORCE_CPU: force_cpu})
+```
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+            
+  <div class="section" id="problem">
+<span id="problem"></span><h1>Problem<a class="headerlink" href="#problem" title="Permalink to this headline">¶</a></h1>
+<p>In PaddlePaddle&#8217;s <a class="reference external" href="https://github.com/PaddlePaddle/Paddle/blob/develop/doc/design/switch_kernel.md">Design</a>, one Operator may have multiple kernels. Users may have some personal preference to choose a certain type of kernel for an operator, such as <code class="docutils literal"><span class="pre">force_cpu</span></code> to choose a CPU kernel, <code class="docutils literal"><span class="pre">use_cudnn</span></code> to choose a CUDNN kernel, we need to provide a way for users to do this.</p>
+<p>In the current design, we use KernelType to describe one kernel.</p>
+<div class="highlight-cpp"><div class="highlight"><pre><span></span><span class="k">struct</span> <span class="n">KernelType</span> <span class="p">{</span>
+  <span class="n">Place</span> <span class="n">place_</span><span class="p">;</span>
+  <span class="n">DataType</span> <span class="n">data_type_</span><span class="p">;</span>
+  <span class="n">LayoutType</span> <span class="n">layout_</span><span class="p">;</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p><code class="docutils literal"><span class="pre">place_</span></code> <code class="docutils literal"><span class="pre">data_type_</span></code> and <code class="docutils literal"><span class="pre">layout_</span></code> can be got from the input tensors of the operator, <code class="docutils literal"><span class="pre">GetActualKernelType(inputs)</span></code> use inputs to infer the proper kernel key that fit the incoming data, but users can not directly configure it.</p>
+<p>The <a class="reference external" href="https://github.com/PaddlePaddle/Paddle/blob/develop/doc/design/switch_kernel.md">design</a> also provides a virtual method <code class="docutils literal"><span class="pre">GetExpectedKernelType</span></code> that user can overload and use to choose the KernelType they want to use.</p>
+<p>So we should send the information user defined in proto to <code class="docutils literal"><span class="pre">GetExpectedKernelType</span></code> for choosing a kernel.</p>
+<p>The problem is, how should we define and send the information for <code class="docutils literal"><span class="pre">GetExpectedKernelType</span></code> to use?</p>
+</div>
+<div class="section" id="solution">
+<span id="solution"></span><h1>Solution<a class="headerlink" href="#solution" title="Permalink to this headline">¶</a></h1>
+<div class="section" id="potential-choice">
+<span id="potential-choice"></span><h2>Potential choice<a class="headerlink" href="#potential-choice" title="Permalink to this headline">¶</a></h2>
+<ol class="simple">
+<li>Do nothing, let the user add the information they want to operator‘s attribute and get them inside <code class="docutils literal"><span class="pre">GetExpectedKernelType</span></code>, this can work properly. But there is a little problem that users may define many kinds of hints for the same purpose, such as <code class="docutils literal"><span class="pre">force_cpu</span></code>, <code class="docutils literal"><span class="pre">use_cpu</span></code>, <code class="docutils literal"><span class="pre">cpu_kernel</span></code> to choose CPU kernel, and <code class="docutils literal"><span class="pre">use_cudnn</span></code>, <code class="docutils literal"><span class="pre">force_cudnn</span></code>, <code class="docutils literal"><span class="pre">cudnn_kernel</span></code> to choose CUDNN kernel.</li>
+<li>Pre-define all the needed option and use a single attr key such as <code class="docutils literal"><span class="pre">kernel_hint</span></code> for the user, this is not so flexible if the user wants to define some more kind of hint.</li>
+</ol>
+</div>
+<div class="section" id="final-choice">
+<span id="final-choice"></span><h2>Final choice<a class="headerlink" href="#final-choice" title="Permalink to this headline">¶</a></h2>
+<p>To provide enough flexibility while avoiding confusion definition, we can define some global constants for these attribute names, such as <code class="docutils literal"><span class="pre">force_cpu</span></code>, <code class="docutils literal"><span class="pre">use_cudnn</span></code>, <code class="docutils literal"><span class="pre">use_mkldnn</span></code> for a user to choose.</p>
+<p>In C++</p>
+<div class="highlight-cpp"><div class="highlight"><pre><span></span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">kForceCPU</span> <span class="o">=</span> <span class="s">&quot;force_cpu&quot;</span><span class="p">;</span>
+<span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">kUseCUDNN</span> <span class="o">=</span> <span class="s">&quot;use_cudnn&quot;</span><span class="p">;</span>
+<span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">kUseMKLDNN</span> <span class="o">=</span> <span class="s">&quot;use_mkldnn&quot;</span><span class="p">;</span>
+
+<span class="n">KernelType</span> <span class="nf">GetExpectedKernelType</span><span class="p">()</span> <span class="p">{</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">Attr</span><span class="o">&lt;</span><span class="kt">bool</span><span class="o">&gt;</span><span class="p">(</span><span class="n">kForceCPU</span><span class="p">))</span> <span class="p">{</span>
+    <span class="k">return</span> <span class="n">KernelType</span><span class="p">(</span><span class="n">CPUPlace</span><span class="p">,</span> <span class="p">...)</span>
+  <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
+    <span class="p">...</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>In Python code</p>
+<div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">FORCE_CPU</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">kForceCPU</span><span class="p">()</span>
+
+<span class="k">def</span> <span class="nf">xx_layer</span><span class="p">(</span><span class="o">...</span><span class="p">,</span> <span class="n">force_cpu</span><span class="o">=</span><span class="n">false</span><span class="p">):</span>
+  <span class="n">layer_helper</span> <span class="o">=</span> <span class="n">LayerHelper</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
+  <span class="n">layer_helper</span><span class="o">.</span><span class="n">append_op</span><span class="p">(</span>
+    <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;xx&quot;</span><span class="p">,</span>
+    <span class="n">attr</span><span class="o">=</span><span class="p">{</span><span class="n">FORCE_CPU</span><span class="p">:</span> <span class="n">force_cpu</span><span class="p">})</span>
+</pre></div>
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--- a/develop/doc/objects.inv
+++ b/develop/doc/objects.inv
--- a/develop/doc/searchindex.js
+++ b/develop/doc/searchindex.js
--- a/develop/doc_cn/_sources/design/kernel_hint_design.md.txt
+++ b/develop/doc_cn/_sources/design/kernel_hint_design.md.txt
+## Problem
+In PaddlePaddle's [Design](https://github.com/PaddlePaddle/Paddle/blob/develop/doc/design/switch_kernel.md), one Operator may have multiple kernels. Users may have some personal preference to choose a certain type of kernel for an operator, such as `force_cpu` to choose a CPU kernel, `use_cudnn` to choose a CUDNN kernel, we need to provide a way for users to do this.
+
+In the current design, we use KernelType to describe one kernel.
+
+```cpp
+struct KernelType {
+  Place place_;
+  DataType data_type_;
+  LayoutType layout_;
+};
+```
+ `place_` `data_type_` and `layout_` can be got from the input tensors of the operator, `GetActualKernelType(inputs)` use inputs to infer the proper kernel key that fit the incoming data, but users can not directly configure it.
+
+The [design](https://github.com/PaddlePaddle/Paddle/blob/develop/doc/design/switch_kernel.md) also provides a virtual method `GetExpectedKernelType` that user can overload and use to choose the KernelType they want to use.
+
+So we should send the information user defined in proto to `GetExpectedKernelType` for choosing a kernel.
+
+The problem is, how should we define and send the information for `GetExpectedKernelType` to use?
+
+## Solution
+
+### Potential choice
+1. Do nothing, let the user add the information they want to operator‘s attribute and get them inside `GetExpectedKernelType`, this can work properly. But there is a little problem that users may define many kinds of hints for the same purpose, such as `force_cpu`, `use_cpu`, `cpu_kernel` to choose CPU kernel, and `use_cudnn`, `force_cudnn`, `cudnn_kernel` to choose CUDNN kernel.
+
+2. Pre-define all the needed option and use a single attr key such as `kernel_hint` for the user, this is not so flexible if the user wants to define some more kind of hint.
+
+### Final choice
+To provide enough flexibility while avoiding confusion definition, we can define some global constants for these attribute names, such as `force_cpu`, `use_cudnn`, `use_mkldnn` for a user to choose.
+
+In C++
+
+```cpp
+const std::string kForceCPU = "force_cpu";
+const std::string kUseCUDNN = "use_cudnn";
+const std::string kUseMKLDNN = "use_mkldnn";
+
+KernelType GetExpectedKernelType() {
+  if (Attr<bool>(kForceCPU)) {
+    return KernelType(CPUPlace, ...)
+  } else {
+    ...
+  }
+}
+```
+
+In Python code
+
+```python
+FORCE_CPU = core.kForceCPU()
+
+def xx_layer(..., force_cpu=false):
+  layer_helper = LayerHelper(...)
+  layer_helper.append_op(
+    type="xx",
+    attr={FORCE_CPU: force_cpu})
+```
--- a/develop/doc_cn/design/kernel_hint_design.html
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+            
+  <div class="section" id="problem">
+<span id="problem"></span><h1>Problem<a class="headerlink" href="#problem" title="永久链接至标题">¶</a></h1>
+<p>In PaddlePaddle&#8217;s <a class="reference external" href="https://github.com/PaddlePaddle/Paddle/blob/develop/doc/design/switch_kernel.md">Design</a>, one Operator may have multiple kernels. Users may have some personal preference to choose a certain type of kernel for an operator, such as <code class="docutils literal"><span class="pre">force_cpu</span></code> to choose a CPU kernel, <code class="docutils literal"><span class="pre">use_cudnn</span></code> to choose a CUDNN kernel, we need to provide a way for users to do this.</p>
+<p>In the current design, we use KernelType to describe one kernel.</p>
+<div class="highlight-cpp"><div class="highlight"><pre><span></span><span class="k">struct</span> <span class="n">KernelType</span> <span class="p">{</span>
+  <span class="n">Place</span> <span class="n">place_</span><span class="p">;</span>
+  <span class="n">DataType</span> <span class="n">data_type_</span><span class="p">;</span>
+  <span class="n">LayoutType</span> <span class="n">layout_</span><span class="p">;</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p><code class="docutils literal"><span class="pre">place_</span></code> <code class="docutils literal"><span class="pre">data_type_</span></code> and <code class="docutils literal"><span class="pre">layout_</span></code> can be got from the input tensors of the operator, <code class="docutils literal"><span class="pre">GetActualKernelType(inputs)</span></code> use inputs to infer the proper kernel key that fit the incoming data, but users can not directly configure it.</p>
+<p>The <a class="reference external" href="https://github.com/PaddlePaddle/Paddle/blob/develop/doc/design/switch_kernel.md">design</a> also provides a virtual method <code class="docutils literal"><span class="pre">GetExpectedKernelType</span></code> that user can overload and use to choose the KernelType they want to use.</p>
+<p>So we should send the information user defined in proto to <code class="docutils literal"><span class="pre">GetExpectedKernelType</span></code> for choosing a kernel.</p>
+<p>The problem is, how should we define and send the information for <code class="docutils literal"><span class="pre">GetExpectedKernelType</span></code> to use?</p>
+</div>
+<div class="section" id="solution">
+<span id="solution"></span><h1>Solution<a class="headerlink" href="#solution" title="永久链接至标题">¶</a></h1>
+<div class="section" id="potential-choice">
+<span id="potential-choice"></span><h2>Potential choice<a class="headerlink" href="#potential-choice" title="永久链接至标题">¶</a></h2>
+<ol class="simple">
+<li>Do nothing, let the user add the information they want to operator‘s attribute and get them inside <code class="docutils literal"><span class="pre">GetExpectedKernelType</span></code>, this can work properly. But there is a little problem that users may define many kinds of hints for the same purpose, such as <code class="docutils literal"><span class="pre">force_cpu</span></code>, <code class="docutils literal"><span class="pre">use_cpu</span></code>, <code class="docutils literal"><span class="pre">cpu_kernel</span></code> to choose CPU kernel, and <code class="docutils literal"><span class="pre">use_cudnn</span></code>, <code class="docutils literal"><span class="pre">force_cudnn</span></code>, <code class="docutils literal"><span class="pre">cudnn_kernel</span></code> to choose CUDNN kernel.</li>
+<li>Pre-define all the needed option and use a single attr key such as <code class="docutils literal"><span class="pre">kernel_hint</span></code> for the user, this is not so flexible if the user wants to define some more kind of hint.</li>
+</ol>
+</div>
+<div class="section" id="final-choice">
+<span id="final-choice"></span><h2>Final choice<a class="headerlink" href="#final-choice" title="永久链接至标题">¶</a></h2>
+<p>To provide enough flexibility while avoiding confusion definition, we can define some global constants for these attribute names, such as <code class="docutils literal"><span class="pre">force_cpu</span></code>, <code class="docutils literal"><span class="pre">use_cudnn</span></code>, <code class="docutils literal"><span class="pre">use_mkldnn</span></code> for a user to choose.</p>
+<p>In C++</p>
+<div class="highlight-cpp"><div class="highlight"><pre><span></span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">kForceCPU</span> <span class="o">=</span> <span class="s">&quot;force_cpu&quot;</span><span class="p">;</span>
+<span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">kUseCUDNN</span> <span class="o">=</span> <span class="s">&quot;use_cudnn&quot;</span><span class="p">;</span>
+<span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">kUseMKLDNN</span> <span class="o">=</span> <span class="s">&quot;use_mkldnn&quot;</span><span class="p">;</span>
+
+<span class="n">KernelType</span> <span class="nf">GetExpectedKernelType</span><span class="p">()</span> <span class="p">{</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">Attr</span><span class="o">&lt;</span><span class="kt">bool</span><span class="o">&gt;</span><span class="p">(</span><span class="n">kForceCPU</span><span class="p">))</span> <span class="p">{</span>
+    <span class="k">return</span> <span class="n">KernelType</span><span class="p">(</span><span class="n">CPUPlace</span><span class="p">,</span> <span class="p">...)</span>
+  <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
+    <span class="p">...</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>In Python code</p>
+<div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">FORCE_CPU</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">kForceCPU</span><span class="p">()</span>
+
+<span class="k">def</span> <span class="nf">xx_layer</span><span class="p">(</span><span class="o">...</span><span class="p">,</span> <span class="n">force_cpu</span><span class="o">=</span><span class="n">false</span><span class="p">):</span>
+  <span class="n">layer_helper</span> <span class="o">=</span> <span class="n">LayerHelper</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
+  <span class="n">layer_helper</span><span class="o">.</span><span class="n">append_op</span><span class="p">(</span>
+    <span class="nb">type</span><span class="o">=</span><span class="s2">&quot;xx&quot;</span><span class="p">,</span>
+    <span class="n">attr</span><span class="o">=</span><span class="p">{</span><span class="n">FORCE_CPU</span><span class="p">:</span> <span class="n">force_cpu</span><span class="p">})</span>
+</pre></div>
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+  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
+  <script src="https://cdn.jsdelivr.net/perfect-scrollbar/0.6.14/js/perfect-scrollbar.jquery.min.js"></script>
+  <script src="../_static/js/paddle_doc_init.js"></script> 
+
+</body>
+</html>
\ No newline at end of file
--- a/develop/doc_cn/objects.inv
+++ b/develop/doc_cn/objects.inv
--- a/develop/doc_cn/searchindex.js
+++ b/develop/doc_cn/searchindex.js