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    <li class="toctree-l3"><a href="#_1">搜索空间参数的配置</a></li>
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                <h2 id="_1">搜索空间参数的配置<a class="headerlink" href="#_1" title="Permanent link">#</a></h2>
<p>通过参数配置搜索空间。更多搜索空间的使用可以参考<a href="../../search_space/">search_space</a></p>
<p><strong>参数：</strong></p>
<ul>
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<li><strong>input_size(int|None)</strong>：- <code>input_size</code>表示输入feature map的大小。<code>input_size</code>和<code>output_size</code>用来计算整个模型结构中下采样次数。</li>
<li><strong>output_size(int|None)</strong>：- <code>output_size</code>表示输出feature map的大小。<code>input_size</code>和<code>output_size</code>用来计算整个模型结构中下采样次数。</li>
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<li><strong>block_num(int|None)</strong>：- <code>block_num</code>表示搜索空间中block的数量。</li>
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<li><strong>block_mask(list|None)</strong>：- <code>block_mask</code>是一组由0、1组成的列表，0表示当前block是normal block，1表示当前block是reduction block。reduction block表示经过这个block之后的feature map大小下降为之前的一半，normal block表示经过这个block之后feature map大小不变。如果设置了<code>block_mask</code>，则主要以<code>block_mask</code>为主要配置，<code>input_size</code>，<code>output_size</code>和<code>block_num</code>三种配置是无效的。</li>
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</ul>
<h2 id="sanas">SANAS<a class="headerlink" href="#sanas" title="Permanent link">#</a></h2>
<dl>
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<dt>paddleslim.nas.SANAS(configs, server_addr=("", 8881), init_temperature=None, reduce_rate=0.85, init_tokens=None, search_steps=300, save_checkpoint='./nas_checkpoint', load_checkpoint=None, is_server=True)<a href="https://github.com/PaddlePaddle/PaddleSlim/blob/develop/paddleslim/nas/sa_nas.py#L36">源代码</a></dt>
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<dd>SANAS（Simulated Annealing Neural Architecture Search）是基于模拟退火算法进行模型结构搜索的算法，一般用于离散搜索任务。</dd>
</dl>
<p><strong>参数：</strong></p>
<ul>
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<li><strong>configs(list<tuple>)</strong> - 搜索空间配置列表，格式是<code>[(key, {input_size, output_size, block_num, block_mask})]</code>或者<code>[(key)]</code>（MobileNetV2、MobilenetV1和ResNet的搜索空间使用和原本网络结构相同的搜索空间，所以仅需指定<code>key</code>即可）, <code>input_size</code> 和<code>output_size</code>表示输入和输出的特征图的大小，<code>block_num</code>是指搜索网络中的block数量，<code>block_mask</code>是一组由0和1组成的列表，0代表不进行下采样的block，1代表下采样的block。 更多paddleslim提供的搜索空间配置可以参考<a href="../../search_space/">Search Space</a>。</li>
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<li><strong>server_addr(tuple)</strong> - SANAS的地址，包括server的ip地址和端口号，如果ip地址为None或者为""的话则默认使用本机ip。默认：（"", 8881）。</li>
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<li><strong>init_temperature(float)</strong> - 基于模拟退火进行搜索的初始温度。如果init_template为None而且init_tokens为None，则默认初始温度为10.0，如果init_template为None且init_tokens不为None，则默认初始温度为1.0。详细的温度设置可以参考下面的Note。默认：None。</li>
<li><strong>reduce_rate(float)</strong> - 基于模拟退火进行搜索的衰减率。详细的退火率设置可以参考下面的Note。默认：0.85。</li>
<li><strong>init_tokens(list|None)</strong> - 初始化token，若init_tokens为空，则SA算法随机生成初始化tokens。默认：None。</li>
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<li><strong>search_steps(int)</strong> - 搜索过程迭代的次数。默认：300。</li>
<li><strong>save_checkpoint(str|None)</strong> - 保存checkpoint的文件目录，如果设置为None的话则不保存checkpoint。默认：<code>./nas_checkpoint</code>。</li>
<li><strong>load_checkpoint(str|None)</strong> - 加载checkpoint的文件目录，如果设置为None的话则不加载checkpoint。默认：None。</li>
<li><strong>is_server(bool)</strong> - 当前实例是否要启动一个server。默认：True。</li>
</ul>
<p><strong>返回：</strong>
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一个SANAS类的实例</p>
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<p><strong>示例代码：</strong>
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<div class="codehilite"><pre><span></span><span class="kn">from</span> <span class="nn">paddleslim.nas</span> <span class="kn">import</span> <span class="n">SANAS</span>
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<span class="n">config</span> <span class="o">=</span> <span class="p">[(</span><span class="s1">&#39;MobileNetV2Space&#39;</span><span class="p">)]</span>
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<span class="n">sanas</span> <span class="o">=</span> <span class="n">SANAS</span><span class="p">(</span><span class="n">configs</span><span class="o">=</span><span class="n">config</span><span class="p">)</span>
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</pre></div></p>
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<div class="admonition note">
<p class="admonition-title">Note</p>
</div>
<ul>
<li>
<p>初始化温度和退火率的意义: <br></p>
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<ul>
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<li>SA算法内部会保存一个基础token（初始化token可以自己传入也可以随机生成）和基础score（初始化score为-1），下一个token会在当前SA算法保存的token的基础上产生。在SA的搜索过程中，如果本轮的token训练得到的score大于SA算法中保存的score，则本轮的token一定会被SA算法接收保存为下一轮token产生的基础token。<br></li>
<li>初始温度越高表示SA算法当前处的阶段越不稳定，本轮的token训练得到的score小于SA算法中保存的score的话，本轮的token和score被SA算法接收的可能性越大。<br></li>
<li>初始温度越低表示SA算法当前处的阶段越稳定，本轮的token训练得到的score小于SA算法中保存的score的话，本轮的token和score被SA算法接收的可能性越小。<br></li>
<li>退火率越大，表示SA算法收敛的越慢，即SA算法越慢到稳定阶段。<br></li>
<li>退火率越低，表示SA算法收敛的越快，即SA算法越快到稳定阶段。<br></li>
</ul>
</li>
<li>
<p>初始化温度和退火率的设置: <br></p>
<ul>
<li>如果原本就有一个较好的初始化token，想要基于这个较好的token来进行搜索的话，SA算法可以处于一个较为稳定的状态进行搜索r这种情况下初始温度可以设置的低一些，例如设置为1.0，退火率设置的大一些，例如设置为0.85。如果想要基于这个较好的token利用贪心算法进行搜索，即只有当本轮token训练得到的score大于SA算法中保存的score，SA算法才接收本轮token，则退火率可设置为一个极小的数字，例如设置为0.85 ** 10。<br></li>
<li>初始化token如果是随机生成的话，代表初始化token是一个比较差的token，SA算法可以处于一种不稳定的阶段进行搜索，尽可能的随机探索所有可能得token，从而找到一个较好的token。初始温度可以设置的高一些，例如设置为1000，退火率相对设置的小一些。</li>
</ul>
</li>
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</ul>
<dl>
<dt>paddleslim.nas.SANAS.next_archs()</dt>
<dd>获取下一组模型结构。</dd>
</dl>
<p><strong>返回：</strong>
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返回模型结构实例的列表，形式为list。</p>
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<p><strong>示例代码：</strong>
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<div class="codehilite"><pre><span></span><span class="kn">import</span> <span class="nn">paddle.fluid</span> <span class="k">as</span> <span class="nn">fluid</span>
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<span class="kn">from</span> <span class="nn">paddleslim.nas</span> <span class="kn">import</span> <span class="n">SANAS</span>
<span class="n">config</span> <span class="o">=</span> <span class="p">[(</span><span class="s1">&#39;MobileNetV2Space&#39;</span><span class="p">)]</span>
<span class="n">sanas</span> <span class="o">=</span> <span class="n">SANAS</span><span class="p">(</span><span class="n">configs</span><span class="o">=</span><span class="n">config</span><span class="p">)</span>
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<span class="nb">input</span> <span class="o">=</span> <span class="n">fluid</span><span class="o">.</span><span class="n">data</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s1">&#39;input&#39;</span><span class="p">,</span> <span class="n">shape</span><span class="o">=</span><span class="p">[</span><span class="kc">None</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">32</span><span class="p">],</span> <span class="n">dtype</span><span class="o">=</span><span class="s1">&#39;float32&#39;</span><span class="p">)</span>
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<span class="n">archs</span> <span class="o">=</span> <span class="n">sanas</span><span class="o">.</span><span class="n">next_archs</span><span class="p">()</span>
<span class="k">for</span> <span class="n">arch</span> <span class="ow">in</span> <span class="n">archs</span><span class="p">:</span>
    <span class="n">output</span> <span class="o">=</span> <span class="n">arch</span><span class="p">(</span><span class="nb">input</span><span class="p">)</span>
    <span class="nb">input</span> <span class="o">=</span> <span class="n">output</span>
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<span class="nb">print</span><span class="p">(</span><span class="n">output</span><span class="p">)</span>
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</pre></div></p>
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<dl>
<dt>paddleslim.nas.SANAS.reward(score)</dt>
<dd>把当前模型结构的得分情况回传。</dd>
</dl>
<p><strong>参数：</strong></p>
<ul>
<li><strong>score<float>:</strong> - 当前模型的得分，分数越大越好。</li>
</ul>
<p><strong>返回：</strong>
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模型结构更新成功或者失败，成功则返回<code>True</code>，失败则返回<code>False</code>。</p>
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<p><strong>示例代码：</strong>
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<div class="codehilite"><pre><span></span><span class="kn">import</span> <span class="nn">paddle.fluid</span> <span class="k">as</span> <span class="nn">fluid</span>
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<span class="kn">from</span> <span class="nn">paddleslim.nas</span> <span class="kn">import</span> <span class="n">SANAS</span>
<span class="n">config</span> <span class="o">=</span> <span class="p">[(</span><span class="s1">&#39;MobileNetV2Space&#39;</span><span class="p">)]</span>
<span class="n">sanas</span> <span class="o">=</span> <span class="n">SANAS</span><span class="p">(</span><span class="n">configs</span><span class="o">=</span><span class="n">config</span><span class="p">)</span>
<span class="n">archs</span> <span class="o">=</span> <span class="n">sanas</span><span class="o">.</span><span class="n">next_archs</span><span class="p">()</span>

<span class="c1">### 假设网络计算出来的score是1，实际代码中使用时需要返回真实score。</span>
<span class="n">score</span><span class="o">=</span><span class="nb">float</span><span class="p">(</span><span class="mf">1.0</span><span class="p">)</span>
<span class="n">sanas</span><span class="o">.</span><span class="n">reward</span><span class="p">(</span><span class="nb">float</span><span class="p">(</span><span class="n">score</span><span class="p">))</span>
</pre></div></p>
<dl>
<dt>paddlesim.nas.SANAS.tokens2arch(tokens)</dt>
<dd>通过一组tokens得到实际的模型结构，一般用来把搜索到最优的token转换为模型结构用来做最后的训练。tokens的形式是一个列表，tokens映射到搜索空间转换成相应的网络结构，一组tokens对应唯一的一个网络结构。</dd>
</dl>
<p><strong>参数：</strong></p>
<ul>
<li><strong>tokens(list):</strong> - 一组tokens。tokens的长度和范取决于搜索空间。</li>
</ul>
<p><strong>返回：</strong>
根据传入的token得到一个模型结构实例。</p>
<p><strong>示例代码：</strong>
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<div class="codehilite"><pre><span></span><span class="kn">import</span> <span class="nn">paddle.fluid</span> <span class="k">as</span> <span class="nn">fluid</span>
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<span class="kn">from</span> <span class="nn">paddleslim.nas</span> <span class="kn">import</span> <span class="n">SANAS</span>
<span class="n">config</span> <span class="o">=</span> <span class="p">[(</span><span class="s1">&#39;MobileNetV2Space&#39;</span><span class="p">)]</span>
<span class="n">sanas</span> <span class="o">=</span> <span class="n">SANAS</span><span class="p">(</span><span class="n">configs</span><span class="o">=</span><span class="n">config</span><span class="p">)</span>
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<span class="nb">input</span> <span class="o">=</span> <span class="n">fluid</span><span class="o">.</span><span class="n">data</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s1">&#39;input&#39;</span><span class="p">,</span> <span class="n">shape</span><span class="o">=</span><span class="p">[</span><span class="kc">None</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">32</span><span class="p">],</span> <span class="n">dtype</span><span class="o">=</span><span class="s1">&#39;float32&#39;</span><span class="p">)</span>
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<span class="n">tokens</span> <span class="o">=</span> <span class="p">([</span><span class="mi">0</span><span class="p">]</span> <span class="o">*</span> <span class="mi">25</span><span class="p">)</span>
<span class="n">archs</span> <span class="o">=</span> <span class="n">sanas</span><span class="o">.</span><span class="n">tokens2arch</span><span class="p">(</span><span class="n">tokens</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
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<span class="nb">print</span><span class="p">(</span><span class="n">archs</span><span class="p">(</span><span class="nb">input</span><span class="p">))</span>
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</pre></div></p>
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<dl>
<dt>paddleslim.nas.SANAS.current_info()</dt>
<dd>返回当前token和搜索过程中最好的token和reward。</dd>
</dl>
<p><strong>返回：</strong>
搜索过程中最好的token，reward和当前训练的token，形式为dict。</p>
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<p><strong>示例代码：</strong>
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<div class="codehilite"><pre><span></span><span class="kn">import</span> <span class="nn">paddle.fluid</span> <span class="k">as</span> <span class="nn">fluid</span>
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<span class="kn">from</span> <span class="nn">paddleslim.nas</span> <span class="kn">import</span> <span class="n">SANAS</span>
<span class="n">config</span> <span class="o">=</span> <span class="p">[(</span><span class="s1">&#39;MobileNetV2Space&#39;</span><span class="p">)]</span>
<span class="n">sanas</span> <span class="o">=</span> <span class="n">SANAS</span><span class="p">(</span><span class="n">configs</span><span class="o">=</span><span class="n">config</span><span class="p">)</span>
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<span class="nb">print</span><span class="p">(</span><span class="n">sanas</span><span class="o">.</span><span class="n">current_info</span><span class="p">())</span>
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</pre></div></p>
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