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| <div class="subTitle">org.apache.mahout.math.hadoop.stochasticsvd</div> |
| <h2 title="Class SparseRowBlockAccumulator" class="title">Class SparseRowBlockAccumulator</h2> |
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| <li>org.apache.mahout.math.hadoop.stochasticsvd.SparseRowBlockAccumulator</li> |
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| <pre>public class <span class="typeNameLabel">SparseRowBlockAccumulator</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.mapred.OutputCollector<<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<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>>, <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">Aggregate incoming rows into blocks based on the row number (long). Rows can |
| be sparse (meaning they come perhaps in big intervals) and don't even have to |
| come in any order, but they should be coming in proximity, so when we output |
| block key, we hopefully aggregate more than one row by then. |
| <P> |
| |
| If block is sufficiently large to fit all rows that mapper may produce, it |
| will not even ever hit a spill at all as we would already be plussing |
| efficiently in the mapper. |
| <P> |
| |
| Also, for sparse inputs it will also be working especially well if transposed |
| columns of the left side matrix and corresponding rows of the right side |
| matrix experience sparsity in same elements. |
| <P></div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/math/hadoop/stochasticsvd/SparseRowBlockAccumulator.html#SparseRowBlockAccumulator-int-org.apache.hadoop.mapred.OutputCollector-">SparseRowBlockAccumulator</a></span>(int height, |
| org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.LongWritable,<a href="../../../../../../org/apache/mahout/math/hadoop/stochasticsvd/SparseRowBlockWritable.html" title="class in org.apache.mahout.math.hadoop.stochasticsvd">SparseRowBlockWritable</a>> delegate)</code> </td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/math/hadoop/stochasticsvd/SparseRowBlockAccumulator.html#close--">close</a></span>()</code> </td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/math/hadoop/stochasticsvd/SparseRowBlockAccumulator.html#collect-java.lang.Long-org.apache.mahout.math.Vector-">collect</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a> rowIndex, |
| <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> v)</code> </td> |
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| <h4>SparseRowBlockAccumulator</h4> |
| <pre>public SparseRowBlockAccumulator(int height, |
| org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.LongWritable,<a href="../../../../../../org/apache/mahout/math/hadoop/stochasticsvd/SparseRowBlockWritable.html" title="class in org.apache.mahout.math.hadoop.stochasticsvd">SparseRowBlockWritable</a>> delegate)</pre> |
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| <h4>collect</h4> |
| <pre>public void collect(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a> rowIndex, |
| <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> v) |
| 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> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code>collect</code> in interface <code>org.apache.hadoop.mapred.OutputCollector<<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<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>></code></dd> |
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| <h4>close</h4> |
| <pre>public void close() |
| 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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