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  <div class="section" id="evaluator">
<h1>Evaluator<a class="headerlink" href="#evaluator" title="Permalink to this headline"></a></h1>
<div class="section" id="id1">
<h2>Evaluator<a class="headerlink" href="#id1" title="Permalink to this headline"></a></h2>
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<dl class="class">
<dt>
<em class="property">class </em><code class="descclassname">paddle.v2.fluid.evaluator.</code><code class="descname">Evaluator</code><span class="sig-paren">(</span><em>name</em>, <em>**kwargs</em><span class="sig-paren">)</span></dt>
<dd><p>Base Class for all evaluators</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>name</strong> (<em>str</em>) &#8211; The name of evaluator. such as, &#8220;accuracy&#8221;. Used for generate
temporary variable name.</li>
<li><strong>main_program</strong> (<em>Program</em><em>, </em><em>optional</em>) &#8211; The evaluator should be added to this
main_program. Default default_main_program()</li>
<li><strong>startup_program</strong> (<em>Program</em><em>, </em><em>optional</em>) &#8211; The parameter should be added to this
startup_program. Default default_startup_program()</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="attribute">
<dt id="paddle.v2.fluid.evaluator.Evaluator.states">
<code class="descname">states</code><a class="headerlink" href="#paddle.v2.fluid.evaluator.Evaluator.states" title="Permalink to this definition"></a></dt>
<dd><p><em>list</em> &#8211; The list of state variables. states will be reset to zero
when <cite>reset</cite> is invoked.</p>
</dd></dl>

<dl class="attribute">
<dt id="paddle.v2.fluid.evaluator.Evaluator.metrics">
<code class="descname">metrics</code><a class="headerlink" href="#paddle.v2.fluid.evaluator.Evaluator.metrics" title="Permalink to this definition"></a></dt>
<dd><p><em>list</em> &#8211; The list of metrics variables. They will be calculate
every mini-batch</p>
</dd></dl>

<dl class="method">
<dt>
<code class="descname">reset</code><span class="sig-paren">(</span><em>executor</em>, <em>reset_program=None</em><span class="sig-paren">)</span></dt>
<dd><p>reset metric states at the begin of each pass/user specified batch</p>
</dd></dl>

<dl class="method">
<dt>
<code class="descname">eval</code><span class="sig-paren">(</span><em>executor</em>, <em>eval_program=None</em><span class="sig-paren">)</span></dt>
<dd><p>Evaluate the statistics merged by multiple mini-batches.</p>
</dd></dl>

<dl class="method">
<dt>
<code class="descname">create_state</code><span class="sig-paren">(</span><em>suffix</em>, <em>dtype</em>, <em>shape</em><span class="sig-paren">)</span></dt>
<dd><p>Create state variable.</p>
<p>NOTE: It is not a public API.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>suffix</strong> (<em>str</em>) &#8211; the state suffix.</li>
<li><strong>dtype</strong> (<em>str|core.DataType</em>) &#8211; the state data type</li>
<li><strong>shape</strong> (<em>tuple|list</em>) &#8211; the shape of state</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>Returns: State variable</p>
</dd></dl>

</dd></dl>
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