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| <div class="subTitle">org.apache.mahout.vectorizer.collocations.llr</div> |
| <h2 title="Class CollocReducer" class="title">Class CollocReducer</h2> |
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| <ul class="inheritance"> |
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| <ul class="inheritance"> |
| <li>org.apache.hadoop.mapreduce.Reducer<<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/GramKey.html" title="class in org.apache.mahout.vectorizer.collocations.llr">GramKey</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>></li> |
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| <li>org.apache.mahout.vectorizer.collocations.llr.CollocReducer</li> |
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| <pre>public class <span class="typeNameLabel">CollocReducer</span> |
| extends org.apache.hadoop.mapreduce.Reducer<<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/GramKey.html" title="class in org.apache.mahout.vectorizer.collocations.llr">GramKey</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>></pre> |
| <div class="block">Reducer for Pass 1 of the collocation identification job. Generates counts for ngrams and subgrams.</div> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/CollocReducer.Skipped.html" title="enum in org.apache.mahout.vectorizer.collocations.llr">CollocReducer.Skipped</a></span></code> </td> |
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| <code>org.apache.hadoop.mapreduce.Reducer.Context</code></li> |
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| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/CollocReducer.html#DEFAULT_MIN_SUPPORT">DEFAULT_MIN_SUPPORT</a></span></code> </td> |
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| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/CollocReducer.html#MIN_SUPPORT">MIN_SUPPORT</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/CollocReducer.html#CollocReducer--">CollocReducer</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/vectorizer/collocations/llr/CollocReducer.html#processSubgram-java.util.Iterator-org.apache.hadoop.mapreduce.Reducer.Context-">processSubgram</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a><<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>> values, |
| org.apache.hadoop.mapreduce.Reducer.Context context)</code> |
| <div class="block">Sum frequencies for subgram, ngrams and deliver ngram, subgram pairs to the collector.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/CollocReducer.html#processUnigram-java.util.Iterator-org.apache.hadoop.mapreduce.Reducer.Context-">processUnigram</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a><<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>> values, |
| org.apache.hadoop.mapreduce.Reducer.Context context)</code> |
| <div class="block">Sum frequencies for unigrams and deliver to the collector</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/CollocReducer.html#reduce-org.apache.mahout.vectorizer.collocations.llr.GramKey-java.lang.Iterable-org.apache.hadoop.mapreduce.Reducer.Context-">reduce</a></span>(<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/GramKey.html" title="class in org.apache.mahout.vectorizer.collocations.llr">GramKey</a> key, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>> values, |
| org.apache.hadoop.mapreduce.Reducer.Context context)</code> |
| <div class="block">collocation finder: pass 1 reduce phase: |
| <p/> |
| given input from the mapper,</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/CollocReducer.html#setup-org.apache.hadoop.mapreduce.Reducer.Context-">setup</a></span>(org.apache.hadoop.mapreduce.Reducer.Context context)</code> </td> |
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| <h3>Methods inherited from class org.apache.hadoop.mapreduce.Reducer</h3> |
| <code>cleanup, run</code></li> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <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>MIN_SUPPORT</h4> |
| <pre>public static final <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> MIN_SUPPORT</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.mahout.vectorizer.collocations.llr.CollocReducer.MIN_SUPPORT">Constant Field Values</a></dd> |
| </dl> |
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| <h4>DEFAULT_MIN_SUPPORT</h4> |
| <pre>public static final int DEFAULT_MIN_SUPPORT</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.mahout.vectorizer.collocations.llr.CollocReducer.DEFAULT_MIN_SUPPORT">Constant Field Values</a></dd> |
| </dl> |
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| <a name="CollocReducer--"> |
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| <h4>CollocReducer</h4> |
| <pre>public CollocReducer()</pre> |
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| <h3>Method Detail</h3> |
| <a name="reduce-org.apache.mahout.vectorizer.collocations.llr.GramKey-java.lang.Iterable-org.apache.hadoop.mapreduce.Reducer.Context-"> |
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| <h4>reduce</h4> |
| <pre>protected void reduce(<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/GramKey.html" title="class in org.apache.mahout.vectorizer.collocations.llr">GramKey</a> key, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>> values, |
| org.apache.hadoop.mapreduce.Reducer.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> |
| <div class="block">collocation finder: pass 1 reduce phase: |
| <p/> |
| given input from the mapper, |
| |
| <pre> |
| k:head_subgram,ngram, v:ngram:partial freq |
| k:head_subgram v:head_subgram:partial freq |
| k:tail_subgram,ngram, v:ngram:partial freq |
| k:tail_subgram v:tail_subgram:partial freq |
| k:unigram v:unigram:partial freq |
| </pre> |
| sum gram frequencies and output for llr calculation |
| <p/> |
| output is: |
| <pre> |
| k:ngram:ngramfreq v:head_subgram:head_subgramfreq |
| k:ngram:ngramfreq v:tail_subgram:tail_subgramfreq |
| k:unigram:unigramfreq v:unigram:unigramfreq |
| </pre> |
| Each ngram's frequency is essentially counted twice, once for head, once for tail. |
| frequency should be the same for the head and tail. Fix this to count only for the |
| head and move the count into the value?</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>reduce</code> in class <code>org.apache.hadoop.mapreduce.Reducer<<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/GramKey.html" title="class in org.apache.mahout.vectorizer.collocations.llr">GramKey</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</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="setup-org.apache.hadoop.mapreduce.Reducer.Context-"> |
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| </a> |
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| <h4>setup</h4> |
| <pre>protected void setup(org.apache.hadoop.mapreduce.Reducer.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.Reducer<<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/GramKey.html" title="class in org.apache.mahout.vectorizer.collocations.llr">GramKey</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>,<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</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="processUnigram-java.util.Iterator-org.apache.hadoop.mapreduce.Reducer.Context-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>processUnigram</h4> |
| <pre>protected void processUnigram(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a><<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>> values, |
| org.apache.hadoop.mapreduce.Reducer.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> |
| <div class="block">Sum frequencies for unigrams and deliver to the collector</div> |
| <dl> |
| <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="processSubgram-java.util.Iterator-org.apache.hadoop.mapreduce.Reducer.Context-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>processSubgram</h4> |
| <pre>protected void processSubgram(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a><<a href="../../../../../../org/apache/mahout/vectorizer/collocations/llr/Gram.html" title="class in org.apache.mahout.vectorizer.collocations.llr">Gram</a>> values, |
| org.apache.hadoop.mapreduce.Reducer.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> |
| <div class="block">Sum frequencies for subgram, ngrams and deliver ngram, subgram pairs to the collector. |
| <p/> |
| Sort order guarantees that the subgram/subgram pairs will be seen first and then |
| subgram/ngram1 pairs, subgram/ngram2 pairs ... subgram/ngramN pairs, so frequencies for |
| ngrams can be calcualted here as well. |
| <p/> |
| We end up calculating frequencies for ngrams for each sugram (head, tail) here, which is |
| some extra work.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <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> |
| <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> |
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