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| <div class="subTitle">org.apache.mahout.ep</div> |
| <h2 title="Class EvolutionaryProcess" class="title">Class EvolutionaryProcess<T extends <a href="../../../../org/apache/mahout/ep/Payload.html" title="interface in org.apache.mahout.ep">Payload</a><U>,U></h2> |
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| <li>org.apache.mahout.ep.EvolutionaryProcess<T,U></li> |
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| <pre>public class <span class="typeNameLabel">EvolutionaryProcess<T extends <a href="../../../../org/apache/mahout/ep/Payload.html" title="interface in org.apache.mahout.ep">Payload</a><U>,U></span> |
| extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements org.apache.hadoop.io.Writable, <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre> |
| <div class="block">Allows evolutionary optimization where the state function can't be easily |
| packaged for the optimizer to execute. A good example of this is with |
| on-line learning where optimizing the learning parameters is desirable. |
| We would like to pass training examples to the learning algorithms, but |
| we definitely want to do the training in multiple threads and then after |
| several training steps, we want to do a selection and mutation step. |
| |
| In such a case, it is highly desirable to leave most of the control flow |
| in the hands of our caller. As such, this class provides three functions, |
| <ul> |
| <li> Storage of the evolutionary state. The state variables have payloads |
| which can be anything that implements Payload. |
| <li> Threaded execution of a single operation on each of the members of the |
| population being evolved. In the on-line learning example, this is used for |
| training all of the classifiers in the population. |
| <li> Propagating mutations of the most successful members of the population. |
| This propagation involves copying the state and the payload and then updating |
| the payload after mutation of the evolutionary state. |
| </ul> |
| |
| The State class that we use for storing the state of each member of the |
| population also provides parameter mapping. Check out Mapping and State |
| for more info.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/mahout/ep/Mapping.html" title="class in org.apache.mahout.ep"><code>Mapping</code></a>, |
| <a href="../../../../org/apache/mahout/ep/Payload.html" title="interface in org.apache.mahout.ep"><code>Payload</code></a>, |
| <a href="../../../../org/apache/mahout/ep/State.html" title="class in org.apache.mahout.ep"><code>State</code></a></dd> |
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| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.Function.html" title="interface in org.apache.mahout.ep">EvolutionaryProcess.Function</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.Function.html" title="type parameter in EvolutionaryProcess.Function">T</a>></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#EvolutionaryProcess--">EvolutionaryProcess</a></span>()</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#EvolutionaryProcess-int-int-org.apache.mahout.ep.State-">EvolutionaryProcess</a></span>(int threadCount, |
| int populationSize, |
| <a href="../../../../org/apache/mahout/ep/State.html" title="class in org.apache.mahout.ep">State</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">T</a>,<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">U</a>> seed)</code> |
| <div class="block">Creates an evolutionary optimization framework with specified threadiness, |
| population size and initial state.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#add-org.apache.mahout.ep.State-">add</a></span>(<a href="../../../../org/apache/mahout/ep/State.html" title="class in org.apache.mahout.ep">State</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">T</a>,<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">U</a>> value)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#close--">close</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/mahout/ep/State.html" title="class in org.apache.mahout.ep">State</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">T</a>,<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">U</a>>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#getPopulation--">getPopulation</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#getPopulationSize--">getPopulationSize</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#getThreadCount--">getThreadCount</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#mutatePopulation-int-">mutatePopulation</a></span>(int survivors)</code> |
| <div class="block">Nuke all but a few of the current population and then repopulate with |
| variants of the survivors.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/mahout/ep/State.html" title="class in org.apache.mahout.ep">State</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">T</a>,<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">U</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#parallelDo-org.apache.mahout.ep.EvolutionaryProcess.Function-">parallelDo</a></span>(<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.Function.html" title="interface in org.apache.mahout.ep">EvolutionaryProcess.Function</a><<a href="../../../../org/apache/mahout/ep/Payload.html" title="interface in org.apache.mahout.ep">Payload</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">U</a>>> fn)</code> |
| <div class="block">Execute an operation on all of the members of the population with many threads.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#readFields-java.io.DataInput-">readFields</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> input)</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#setThreadCount-int-">setThreadCount</a></span>(int threadCount)</code> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html#write-java.io.DataOutput-">write</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out)</code> </td> |
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| <a name="EvolutionaryProcess--"> |
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| <h4>EvolutionaryProcess</h4> |
| <pre>public EvolutionaryProcess()</pre> |
| </li> |
| </ul> |
| <a name="EvolutionaryProcess-int-int-org.apache.mahout.ep.State-"> |
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| <h4>EvolutionaryProcess</h4> |
| <pre>public EvolutionaryProcess(int threadCount, |
| int populationSize, |
| <a href="../../../../org/apache/mahout/ep/State.html" title="class in org.apache.mahout.ep">State</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">T</a>,<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">U</a>> seed)</pre> |
| <div class="block">Creates an evolutionary optimization framework with specified threadiness, |
| population size and initial state.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>threadCount</code> - How many threads to use in parallelDo</dd> |
| <dd><code>populationSize</code> - How large a population to use</dd> |
| <dd><code>seed</code> - An initial population member</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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| <a name="add-org.apache.mahout.ep.State-"> |
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| <h4>add</h4> |
| <pre>public void add(<a href="../../../../org/apache/mahout/ep/State.html" title="class in org.apache.mahout.ep">State</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">T</a>,<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">U</a>> value)</pre> |
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| <h4>mutatePopulation</h4> |
| <pre>public void mutatePopulation(int survivors)</pre> |
| <div class="block">Nuke all but a few of the current population and then repopulate with |
| variants of the survivors.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>survivors</code> - How many survivors we want to keep.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="parallelDo-org.apache.mahout.ep.EvolutionaryProcess.Function-"> |
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| <h4>parallelDo</h4> |
| <pre>public <a href="../../../../org/apache/mahout/ep/State.html" title="class in org.apache.mahout.ep">State</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">T</a>,<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">U</a>> parallelDo(<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.Function.html" title="interface in org.apache.mahout.ep">EvolutionaryProcess.Function</a><<a href="../../../../org/apache/mahout/ep/Payload.html" title="interface in org.apache.mahout.ep">Payload</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">U</a>>> fn) |
| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a>, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</a></pre> |
| <div class="block">Execute an operation on all of the members of the population with many threads. The |
| return value is taken as the current fitness of the corresponding member.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>fn</code> - What to do on each member. Gets payload and the mapped parameters as args.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The member of the population with the best fitness.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code> - Shouldn't happen.</dd> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</a></code> - If fn throws an exception, that exception will be collected |
| and rethrown nested in an ExecutionException.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <pre>public void setThreadCount(int threadCount)</pre> |
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| <pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/mahout/ep/State.html" title="class in org.apache.mahout.ep">State</a><<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">T</a>,<a href="../../../../org/apache/mahout/ep/EvolutionaryProcess.html" title="type parameter in EvolutionaryProcess">U</a>>> getPopulation()</pre> |
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| <h4>close</h4> |
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| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
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| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
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