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| <h2 title="Class ModelDissector" class="title">Class ModelDissector</h2> |
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| <li>org.apache.mahout.classifier.sgd.ModelDissector</li> |
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| <pre>public class <span class="typeNameLabel">ModelDissector</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></pre> |
| <div class="block">Uses sample data to reverse engineer a feature-hashed model. |
| |
| The result gives approximate weights for features and interactions |
| in the original space. |
| |
| The idea is that the hashed encoders have the option of having a trace dictionary. This |
| tells us where each feature is hashed to, or each feature/value combination in the case |
| of word-like values. Using this dictionary, we can put values into a synthetic feature |
| vector in just the locations specified by a single feature or interaction. Then we can |
| push this through a linear part of a model to see the contribution of that input. For |
| any generalized linear model like logistic regression, there is a linear part of the |
| model that allows this. |
| |
| What the ModelDissector does is to accept a trace dictionary and a model in an update |
| method. It figures out the weights for the elements in the trace dictionary and stashes |
| them. Then in a summary method, the biggest weights are returned. This update/flush |
| style is used so that the trace dictionary doesn't have to grow to enormous levels, |
| but instead can be cleared between updates.</div> |
| </li> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/classifier/sgd/ModelDissector.Weight.html" title="class in org.apache.mahout.classifier.sgd">ModelDissector.Weight</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/classifier/sgd/ModelDissector.html#ModelDissector--">ModelDissector</a></span>()</code> </td> |
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| <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/classifier/sgd/ModelDissector.Weight.html" title="class in org.apache.mahout.classifier.sgd">ModelDissector.Weight</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/classifier/sgd/ModelDissector.html#summary-int-">summary</a></span>(int n)</code> |
| <div class="block">Returns the n most important features with their |
| weights, most important category and the top few |
| categories that they affect.</div> |
| </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/classifier/sgd/ModelDissector.html#update-org.apache.mahout.math.Vector-java.util.Map-org.apache.mahout.classifier.AbstractVectorClassifier-">update</a></span>(<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a> features, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>>> traceDictionary, |
| <a href="../../../../../org/apache/mahout/classifier/AbstractVectorClassifier.html" title="class in org.apache.mahout.classifier">AbstractVectorClassifier</a> learner)</code> |
| <div class="block">Probes a model to determine the effect of a particular variable.</div> |
| </td> |
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| <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
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| <h4>ModelDissector</h4> |
| <pre>public ModelDissector()</pre> |
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| <a name="update-org.apache.mahout.math.Vector-java.util.Map-org.apache.mahout.classifier.AbstractVectorClassifier-"> |
| <!-- --> |
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| <h4>update</h4> |
| <pre>public void update(<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a> features, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>>> traceDictionary, |
| <a href="../../../../../org/apache/mahout/classifier/AbstractVectorClassifier.html" title="class in org.apache.mahout.classifier">AbstractVectorClassifier</a> learner)</pre> |
| <div class="block">Probes a model to determine the effect of a particular variable. This is done |
| with the ade of a trace dictionary which has recorded the locations in the feature |
| vector that are modified by various variable values. We can set these locations to |
| 1 and then look at the resulting score. This tells us the weight the model places |
| on that variable.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>features</code> - A feature vector to use (destructively)</dd> |
| <dd><code>traceDictionary</code> - A trace dictionary containing variables and what locations |
| in the feature vector are affected by them</dd> |
| <dd><code>learner</code> - The model that we are probing to find weights on features</dd> |
| </dl> |
| </li> |
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| <h4>summary</h4> |
| <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/classifier/sgd/ModelDissector.Weight.html" title="class in org.apache.mahout.classifier.sgd">ModelDissector.Weight</a>> summary(int n)</pre> |
| <div class="block">Returns the n most important features with their |
| weights, most important category and the top few |
| categories that they affect.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>n</code> - How many results to return.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A list of the top variables.</dd> |
| </dl> |
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