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| <div class="subTitle">org.apache.commons.math3.ml.neuralnet</div> |
| <h2 title="Class Neuron" class="title">Class Neuron</h2> |
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| <li>org.apache.commons.math3.ml.neuralnet.Neuron</li> |
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| <pre>public class <span class="strong">Neuron</span> |
| extends <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="http://docs.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre> |
| <div class="block">Describes a neuron element of a neural network. |
| |
| This class aims to be thread-safe.</div> |
| <dl><dt><span class="strong">Since:</span></dt> |
| <dd>3.3</dd> |
| <dt><span class="strong">Version:</span></dt> |
| <dd>$Id: Neuron.java 1566092 2014-02-08 18:48:29Z tn $</dd> |
| <dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../../serialized-form.html#org.apache.commons.math3.ml.neuralnet.Neuron">Serialized Form</a></dd></dl> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/commons/math3/ml/neuralnet/Neuron.html#compareAndSetFeatures(double[], double[])">compareAndSetFeatures</a></strong>(double[] expect, |
| double[] update)</code> |
| <div class="block">Tries to atomically update the neuron's features.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>double[]</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/commons/math3/ml/neuralnet/Neuron.html#getFeatures()">getFeatures</a></strong>()</code> |
| <div class="block">Gets the neuron's features.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/commons/math3/ml/neuralnet/Neuron.html#getIdentifier()">getIdentifier</a></strong>()</code> |
| <div class="block">Gets the neuron's identifier.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/commons/math3/ml/neuralnet/Neuron.html#getSize()">getSize</a></strong>()</code> |
| <div class="block">Gets the length of the feature set.</div> |
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| <h4>getIdentifier</h4> |
| <pre>public long getIdentifier()</pre> |
| <div class="block">Gets the neuron's identifier.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the identifier.</dd></dl> |
| </li> |
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| <h4>getSize</h4> |
| <pre>public int getSize()</pre> |
| <div class="block">Gets the length of the feature set.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the number of features.</dd></dl> |
| </li> |
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| <h4>getFeatures</h4> |
| <pre>public double[] getFeatures()</pre> |
| <div class="block">Gets the neuron's features.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>a copy of the neuron's features.</dd></dl> |
| </li> |
| </ul> |
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| <h4>compareAndSetFeatures</h4> |
| <pre>public boolean compareAndSetFeatures(double[] expect, |
| double[] update)</pre> |
| <div class="block">Tries to atomically update the neuron's features. |
| Update will be performed only if the expected values match the |
| current values.<br/> |
| In effect, when concurrent threads call this method, the state |
| could be modified by one, so that it does not correspond to the |
| the state assumed by another. |
| Typically, a caller <a href="../../../../../../org/apache/commons/math3/ml/neuralnet/Neuron.html#getFeatures()"><code>retrieves the current state</code></a>, |
| and uses it to compute the new state. |
| During this computation, another thread might have done the same |
| thing, and updated the state: If the current thread were to proceed |
| with its own update, it would overwrite the new state (which might |
| already have been used by yet other threads). |
| To prevent this, the method does not perform the update when a |
| concurrent modification has been detected, and returns <code>false</code>. |
| When this happens, the caller should fetch the new current state, |
| redo its computation, and call this method again.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>expect</code> - Current values of the features, as assumed by the caller. |
| Update will never succeed if the contents of this array does not match |
| the values returned by <a href="../../../../../../org/apache/commons/math3/ml/neuralnet/Neuron.html#getFeatures()"><code>getFeatures()</code></a>.</dd><dd><code>update</code> - Features's new values.</dd> |
| <dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the update was successful, <code>false</code> |
| otherwise.</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if the length of <code>update</code> is |
| not the same as specified in the <a href="../../../../../../org/apache/commons/math3/ml/neuralnet/Neuron.html#Neuron(long, double[])"><code>constructor</code></a>.</dd></dl> |
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