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<h1 title="Package" class="title">Package&nbsp;org.apache.mahout.cf.taste.impl.common</h1>
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<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Interface Summary table, listing interfaces, and an explanation">
<caption><span>Interface Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
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<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.MatchPredicate.html" title="interface in org.apache.mahout.cf.taste.impl.common">Cache.MatchPredicate</a>&lt;T&gt;</td>
<td class="colLast">
<div class="block">Used by {#link #removeKeysMatching(Object)} to decide things that are matching.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common">LongPrimitiveIterator</a></td>
<td class="colLast">
<div class="block">Adds notion of iterating over <code>long</code> primitives in the style of an <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util"><code>Iterator</code></a> -- as
opposed to iterating over <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang"><code>Long</code></a>.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common">Retriever</a>&lt;K,V&gt;</td>
<td class="colLast">
<div class="block">
Implementations can retrieve a value for a given key.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/RunningAverage.html" title="interface in org.apache.mahout.cf.taste.impl.common">RunningAverage</a></td>
<td class="colLast">
<div class="block">
Interface for classes that can keep track of a running average of a series of numbers.</div>
</td>
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<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/RunningAverageAndStdDev.html" title="interface in org.apache.mahout.cf.taste.impl.common">RunningAverageAndStdDev</a></td>
<td class="colLast">
<div class="block">
Extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/RunningAverage.html" title="interface in org.apache.mahout.cf.taste.impl.common"><code>RunningAverage</code></a> by adding standard deviation too.</div>
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<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/SkippingIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common">SkippingIterator</a>&lt;V&gt;</td>
<td class="colLast">
<div class="block">Adds ability to skip ahead in an iterator, perhaps more efficiently than by calling <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true#next--" title="class or interface in java.util"><code>Iterator.next()</code></a>
repeatedly.</div>
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<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation">
<caption><span>Class Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/AbstractLongPrimitiveIterator.html" title="class in org.apache.mahout.cf.taste.impl.common">AbstractLongPrimitiveIterator</a></td>
<td class="colLast">&nbsp;</td>
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<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="class in org.apache.mahout.cf.taste.impl.common">Cache</a>&lt;K,V&gt;</td>
<td class="colLast">
<div class="block">
An efficient Map-like class which caches values for keys.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastByIDMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastByIDMap</a>&lt;V&gt;</td>
<td class="colLast">&nbsp;</td>
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<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastIDSet.html" title="class in org.apache.mahout.cf.taste.impl.common">FastIDSet</a></td>
<td class="colLast">&nbsp;</td>
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<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastMap.html" title="class in org.apache.mahout.cf.taste.impl.common">FastMap</a>&lt;K,V&gt;</td>
<td class="colLast">
<div class="block">
This is an optimized <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util"><code>Map</code></a> implementation, based on algorithms described in Knuth's "Art of Computer
Programming", Vol.</div>
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<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FixedRunningAverage.html" title="class in org.apache.mahout.cf.taste.impl.common">FixedRunningAverage</a></td>
<td class="colLast">
<div class="block">
A simple class that represents a fixed value of an average and count.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FixedRunningAverageAndStdDev.html" title="class in org.apache.mahout.cf.taste.impl.common">FixedRunningAverageAndStdDev</a></td>
<td class="colLast">
<div class="block">
A simple class that represents a fixed value of an average, count and standard deviation.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FullRunningAverage.html" title="class in org.apache.mahout.cf.taste.impl.common">FullRunningAverage</a></td>
<td class="colLast">
<div class="block">
A simple class that can keep track of a running average of a series of numbers.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FullRunningAverageAndStdDev.html" title="class in org.apache.mahout.cf.taste.impl.common">FullRunningAverageAndStdDev</a></td>
<td class="colLast">
<div class="block">
Extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FullRunningAverage.html" title="class in org.apache.mahout.cf.taste.impl.common"><code>FullRunningAverage</code></a> to add a running standard deviation computation.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/InvertedRunningAverage.html" title="class in org.apache.mahout.cf.taste.impl.common">InvertedRunningAverage</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/InvertedRunningAverageAndStdDev.html" title="class in org.apache.mahout.cf.taste.impl.common">InvertedRunningAverageAndStdDev</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveArrayIterator.html" title="class in org.apache.mahout.cf.taste.impl.common">LongPrimitiveArrayIterator</a></td>
<td class="colLast">
<div class="block">While long[] is an Iterable, it is not an Iterable&lt;Long&gt;.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/RefreshHelper.html" title="class in org.apache.mahout.cf.taste.impl.common">RefreshHelper</a></td>
<td class="colLast">
<div class="block">A helper class for implementing <a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common"><code>Refreshable</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/SamplingLongPrimitiveIterator.html" title="class in org.apache.mahout.cf.taste.impl.common">SamplingLongPrimitiveIterator</a></td>
<td class="colLast">
<div class="block">Wraps a <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common"><code>LongPrimitiveIterator</code></a> and returns only some subset of the elements that it would,
as determined by a sampling rate parameter.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/WeightedRunningAverage.html" title="class in org.apache.mahout.cf.taste.impl.common">WeightedRunningAverage</a></td>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/WeightedRunningAverageAndStdDev.html" title="class in org.apache.mahout.cf.taste.impl.common">WeightedRunningAverageAndStdDev</a></td>
<td class="colLast">
<div class="block">This subclass also provides for a weighted estimate of the sample standard deviation.</div>
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