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Perceptron.html
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<!DOCTYPE html>
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<title>wink-perceptron - Wink JS - Perceptron</title>
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<h1 class="page-title">Perceptron</h1>
<section>
<header>
<!--<h2>
Perceptron
</h2>-->
<div class="class-description"><p>Multi-class Averaged Perceptron class.</p></div>
</header>
<article>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id="defineConfig">
defineConfig
</h4>
<div class="name-signature"><span class="type-signature"></span>defineConfig<span class="signature">(config)</span><span class="type-signature"> → {object}</span></div
<dl class="details">
<!--
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="wink-perceptron.js.html">wink-perceptron.js</a>, <a href="wink-perceptron.js.html#line326">line 326</a>
</li></ul></dd>
-->
</dl>
<div class="description">
<p>Defines the hyperparameters for perceptron.</p>
</div>
<h5>Example</h5>
<pre class="prettyprint"><code>// Enable random shuffling of examples!
myPerceptron.defineConfig( { shuffleData: true } );
// -> { shuffleData: true, maxIterations: 9, featureExtractor: null }</code></pre>
<h5>Parameters</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name">config</td>
<td class="type">
<span class="param-type">object</span>
</td>
<td class="description last"><p>table below details the properties of <code>config</code> object.</p>
<p><em>An empty config object restores the default configuration.</em></p>
<h6>Properties</h6>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name">shuffleData</td>
<td class="type">
<span class="param-type">boolean</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
false
</td>
<td class="description last"><p>determines whether or not the
training examples should be randomly shuffled after each iteration a.k.a epoch.</p></td>
</tr>
<tr>
<td class="name">maxIterations</td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
9
</td>
<td class="description last"><p>number of passes that must be made
over the examples in order to complete the learning.</p></td>
</tr>
<tr>
<td class="name">featureExtractor</td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
null
</td>
<td class="description last"><p>extracts feature(s) along with the corresponding class label(s)
from example prior to each iteration. This is useful when raw examples need to be
passed to <a href="#learn"><code>learn()</code></a> instead of features & labels. If it extracts >1 features
then each of the extracted feature/label pair is processed sequentially during learning.
Note <code>shuffleData</code> value will only control the shuffling of input examples and
not of the extracted features with this function.</p></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<h5>Returns</h5>
<div class="param-desc">
<p>A copy of configuration defined.</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">object</span>
</dd>
</dl>
<hr>
<h4 class="name" id="exportJSON">
exportJSON
</h4>
<div class="name-signature"><span class="type-signature"></span>exportJSON<span class="signature">()</span><span class="type-signature"> → {string}</span></div
<dl class="details">
<!--
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="wink-perceptron.js.html">wink-perceptron.js</a>, <a href="wink-perceptron.js.html#line405">line 405</a>
</li></ul></dd>
-->
</dl>
<div class="description">
<p>Exports the learning as a JSON, which may be saved as a text file for
later use via <a href="#importJSON"><code>importJSON()</code></a>.</p>
</div>
<h5>Example</h5>
<pre class="prettyprint"><code>// Assuming that learn() method has been already succesful.
myPerceptron.exportJSON();
// -> JSON string.</code></pre>
<h5>Throws</h5>
<div class="param-desc">
<p>Error if export is attempted without <a href="#learn">learning</a>.</p>
</div>
<h5>Returns</h5>
<div class="param-desc">
<p>Learning in JSON format.</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">string</span>
</dd>
</dl>
<hr>
<h4 class="name" id="importJSON">
importJSON
</h4>
<div class="name-signature"><span class="type-signature"></span>importJSON<span class="signature">(json)</span><span class="type-signature"> → {boolean}</span></div
<dl class="details">
<!--
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="wink-perceptron.js.html">wink-perceptron.js</a>, <a href="wink-perceptron.js.html#line434">line 434</a>
</li></ul></dd>
-->
</dl>
<div class="description">
<p>Imports an existing JSON learning for prediction purpose <strong>only</strong>; it cannot
be used for further <a href="#learn">learning</a>.</p>
</div>
<h5>Example</h5>
<pre class="prettyprint"><code>// Assuming that `json` already has a valid JSON string.
myPerceptron.importJSON( json );</code></pre>
<h5>Parameters</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name">json</td>
<td class="type">
<span class="param-type">JSON</span>
</td>
<td class="description last"><p>containing learnings in as exported by <a href="#exportjson"><code>exportJSON</code></a>.</p></td>
</tr>
</tbody>
</table>
<h5>Throws</h5>
<div class="param-desc">
<p>Error if <code>json</code> is invalid.</p>
</div>
<h5>Returns</h5>
<div class="param-desc">
<p>Always true.</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">boolean</span>
</dd>
</dl>
<hr>
<h4 class="name" id="learn">
learn
</h4>
<div class="name-signature"><span class="type-signature"></span>learn<span class="signature">(examples)</span><span class="type-signature"> → {number}</span></div
<dl class="details">
<!--
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="wink-perceptron.js.html">wink-perceptron.js</a>, <a href="wink-perceptron.js.html#line264">line 264</a>
</li></ul></dd>
-->
</dl>
<div class="description">
<p>Learns from the <strong>examples</strong>. The hyperparameters, defined via <a href="#defineConfig"><code>defineConfig</code></a>,
control learning process.</p>
</div>
<h5>Example</h5>
<pre class="prettyprint"><code>myPerceptron.learn( examples );</code></pre>
<h5>Parameters</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name">examples</td>
<td class="type">
<span class="param-type">Array.<array></span>
</td>
<td class="description last"><p>each example is a 2-element array. The
first element describes example's features and the second one defines
its class label. Both of these are expressed in form of an object. The
features object contains <strong>name/numeric-value</strong> pairs for every feature, whereas the
class label contains single name/string-value pair as <code>{ label: <class> }</code>.</p></td>
</tr>