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| <div class="subTitle">org.apache.mahout.clustering.lda.cvb</div> |
| <h2 title="Class CachingCVB0Mapper" class="title">Class CachingCVB0Mapper</h2> |
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| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a>,org.apache.hadoop.io.IntWritable,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a>></li> |
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| <li>org.apache.mahout.clustering.lda.cvb.CachingCVB0Mapper</li> |
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| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../../org/apache/mahout/clustering/lda/cvb/CVB0DocInferenceMapper.html" title="class in org.apache.mahout.clustering.lda.cvb">CVB0DocInferenceMapper</a></dd> |
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| <pre>public class <span class="typeNameLabel">CachingCVB0Mapper</span> |
| extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a>,org.apache.hadoop.io.IntWritable,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a>></pre> |
| <div class="block">Run ensemble learning via loading the <a href="../../../../../../org/apache/mahout/clustering/lda/cvb/ModelTrainer.html" title="class in org.apache.mahout.clustering.lda.cvb"><code>ModelTrainer</code></a> with two <a href="../../../../../../org/apache/mahout/clustering/lda/cvb/TopicModel.html" title="class in org.apache.mahout.clustering.lda.cvb"><code>TopicModel</code></a> instances: |
| one from the previous iteration, the other empty. Inference is done on the first, and the |
| learning updates are stored in the second, and only emitted at cleanup(). |
| <p/> |
| In terms of obvious performance improvements still available, the memory footprint in this |
| Mapper could be dropped by half if we accumulated model updates onto the model we're using |
| for inference, which might also speed up convergence, as we'd be able to take advantage of |
| learning <em>during</em> iteration, not just after each one is done. Most likely we don't |
| really need to accumulate double values in the model either, floats would most likely be |
| sufficient. Between these two, we could squeeze another factor of 4 in memory efficiency. |
| <p/> |
| In terms of CPU, we're re-learning the p(topic|doc) distribution on every iteration, starting |
| from scratch. This is usually only 10 fixed-point iterations per doc, but that's 10x more than |
| only 1. To avoid having to do this, we would need to do a map-side join of the unchanging |
| corpus with the continually-improving p(topic|doc) matrix, and then emit multiple outputs |
| from the mappers to make sure we can do the reduce model averaging as well. Tricky, but |
| possibly worth it. |
| <p/> |
| <a href="../../../../../../org/apache/mahout/clustering/lda/cvb/ModelTrainer.html" title="class in org.apache.mahout.clustering.lda.cvb"><code>ModelTrainer</code></a> already takes advantage (in maybe the not-nice way) of multi-core |
| availability by doing multithreaded learning, see that class for details.</div> |
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| <h3>Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper</h3> |
| <code>org.apache.hadoop.mapreduce.Mapper.Context</code></li> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/lda/cvb/CachingCVB0Mapper.html#CachingCVB0Mapper--">CachingCVB0Mapper</a></span>()</code> </td> |
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| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/lda/cvb/CachingCVB0Mapper.html#cleanup-org.apache.hadoop.mapreduce.Mapper.Context-">cleanup</a></span>(org.apache.hadoop.mapreduce.Mapper.Context context)</code> </td> |
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| <td class="colFirst"><code>protected int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/lda/cvb/CachingCVB0Mapper.html#getMaxIters--">getMaxIters</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../../org/apache/mahout/clustering/lda/cvb/ModelTrainer.html" title="class in org.apache.mahout.clustering.lda.cvb">ModelTrainer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/lda/cvb/CachingCVB0Mapper.html#getModelTrainer--">getModelTrainer</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>protected int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/lda/cvb/CachingCVB0Mapper.html#getNumTopics--">getNumTopics</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/lda/cvb/CachingCVB0Mapper.html#map-org.apache.hadoop.io.IntWritable-org.apache.mahout.math.VectorWritable-org.apache.hadoop.mapreduce.Mapper.Context-">map</a></span>(org.apache.hadoop.io.IntWritable docId, |
| <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a> document, |
| org.apache.hadoop.mapreduce.Mapper.Context context)</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/lda/cvb/CachingCVB0Mapper.html#setup-org.apache.hadoop.mapreduce.Mapper.Context-">setup</a></span>(org.apache.hadoop.mapreduce.Mapper.Context context)</code> </td> |
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| <code>run</code></li> |
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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>CachingCVB0Mapper</h4> |
| <pre>public CachingCVB0Mapper()</pre> |
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| <h4>getModelTrainer</h4> |
| <pre>protected <a href="../../../../../../org/apache/mahout/clustering/lda/cvb/ModelTrainer.html" title="class in org.apache.mahout.clustering.lda.cvb">ModelTrainer</a> getModelTrainer()</pre> |
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| <pre>protected int getNumTopics()</pre> |
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| <h4>setup</h4> |
| <pre>protected void setup(org.apache.hadoop.mapreduce.Mapper.Context context) |
| 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>, |
| <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></pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>setup</code> in class <code>org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a>,org.apache.hadoop.io.IntWritable,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a>></code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><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></code></dd> |
| <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></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="map-org.apache.hadoop.io.IntWritable-org.apache.mahout.math.VectorWritable-org.apache.hadoop.mapreduce.Mapper.Context-"> |
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| <h4>map</h4> |
| <pre>public void map(org.apache.hadoop.io.IntWritable docId, |
| <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a> document, |
| org.apache.hadoop.mapreduce.Mapper.Context context) |
| 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>, |
| <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></pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>map</code> in class <code>org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a>,org.apache.hadoop.io.IntWritable,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a>></code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><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></code></dd> |
| <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></dd> |
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| <h4>cleanup</h4> |
| <pre>protected void cleanup(org.apache.hadoop.mapreduce.Mapper.Context context) |
| 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>, |
| <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></pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>cleanup</code> in class <code>org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a>,org.apache.hadoop.io.IntWritable,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VectorWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VectorWritable</a>></code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><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></code></dd> |
| <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></dd> |
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