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| <h1 title="Package" class="title">Package com.yahoo.sketches.pig.frequencies</h1> |
| <div class="docSummary"> |
| <div class="block">This package is dedicated to streaming algorithms that enable estimation of the |
| frequency of occurence of items in a weighted multiset stream of items.</div> |
| </div> |
| <p>See: <a href="#package.description">Description</a></p> |
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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"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/AlgebraicInitial.html" title="class in com.yahoo.sketches.pig.frequencies">AlgebraicInitial</a></td> |
| <td class="colLast"> |
| <div class="block">This is a common pass-through implementation for initial step of an Algebraic operation</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/DataToFrequentItemsSketch.html" title="class in com.yahoo.sketches.pig.frequencies">DataToFrequentItemsSketch</a><T></td> |
| <td class="colLast"> |
| <div class="block">This is a generic implementation to be specialized in concrete UDFs</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/DataToFrequentItemsSketchAlgebraicIntermediateFinal.html" title="class in com.yahoo.sketches.pig.frequencies">DataToFrequentItemsSketchAlgebraicIntermediateFinal</a><T></td> |
| <td class="colLast"> |
| <div class="block">Class used to calculate the intermediate pass (combiner) or the final pass |
| (reducer) of an Algebraic sketch operation.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/DataToFrequentStringsSketch.html" title="class in com.yahoo.sketches.pig.frequencies">DataToFrequentStringsSketch</a></td> |
| <td class="colLast"> |
| <div class="block">This UDF creates a FrequentItemsSketch<String> from raw data.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/DataToFrequentStringsSketch.Initial.html" title="class in com.yahoo.sketches.pig.frequencies">DataToFrequentStringsSketch.Initial</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/DataToFrequentStringsSketch.IntermediateFinal.html" title="class in com.yahoo.sketches.pig.frequencies">DataToFrequentStringsSketch.IntermediateFinal</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/FrequentStringsSketchToEstimates.html" title="class in com.yahoo.sketches.pig.frequencies">FrequentStringsSketchToEstimates</a></td> |
| <td class="colLast"> |
| <div class="block">This UDF converts a FrequentItemsSketch<String> to estimates: |
| {(item, estimate, upper bound, lower bound), ...}</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/UnionFrequentItemsSketch.html" title="class in com.yahoo.sketches.pig.frequencies">UnionFrequentItemsSketch</a><T></td> |
| <td class="colLast"> |
| <div class="block">This is a generic implementation to be specialized in concrete UDFs</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/UnionFrequentItemsSketchAlgebraicIntermediateFinal.html" title="class in com.yahoo.sketches.pig.frequencies">UnionFrequentItemsSketchAlgebraicIntermediateFinal</a><T></td> |
| <td class="colLast"> |
| <div class="block">This is to calculate the intermediate pass (combiner) or the final pass |
| (reducer) of an Algebraic sketch operation.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/UnionFrequentStringsSketch.html" title="class in com.yahoo.sketches.pig.frequencies">UnionFrequentStringsSketch</a></td> |
| <td class="colLast"> |
| <div class="block">This is to union FrequentItemsSketch<String>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/UnionFrequentStringsSketch.Initial.html" title="class in com.yahoo.sketches.pig.frequencies">UnionFrequentStringsSketch.Initial</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../com/yahoo/sketches/pig/frequencies/UnionFrequentStringsSketch.IntermediateFinal.html" title="class in com.yahoo.sketches.pig.frequencies">UnionFrequentStringsSketch.IntermediateFinal</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| </ul> |
| <a name="package.description"> |
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| </a> |
| <h2 title="Package com.yahoo.sketches.pig.frequencies Description">Package com.yahoo.sketches.pig.frequencies Description</h2> |
| <div class="block"><p>This package is dedicated to streaming algorithms that enable estimation of the |
| frequency of occurence of items in a weighted multiset stream of items. |
| If the frequency distribution of items is sufficiently skewed, these algorithms are very |
| useful in identifying the "Heavy Hitters" that occured most frequently in the stream. |
| The accuracy of the estimation of the frequency of an item has well understood error |
| bounds that can be returned by the sketch.</p> |
| |
| <p>These sketches are mergable and can be serialized and deserialized to/from a compact |
| form.</p></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Lee Rhodes</dd> |
| </dl> |
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