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<li> <a href="/algorithms/regression/fittness-tests.html">Fitness Tests</a></li> - </ul> - </div> - <a href="#reccomenders" class="list-group-item list-group-item-success" data-toggle="collapse" data-parent="#AlgoMenu"><b>Reccomenders</b><i class="fa fa-caret-down"></i></a> - <div class="collapse" id="reccomenders"> - <ul class="nav sidebar-nav"> - <li> <a href="/algorithms/reccomenders">Reccomender Overview</a></li> - <li> <a href="/algorithms/reccomenders/cco.html">CCO</a></li> - <li> <a href="/algorithms/reccomenders/d-als.html">Distributed Alternating Least Squares</a></li> - </ul> - </div> - </div> - <span><b>Map Reduce Algorithms</b> (deprecated)</span> - <div class="list-group panel"> - <a href="#classification" class="list-group-item list-group-item-success" data-toggle="collapse" data-parent="#AlgoMenu"><b>Classification</b><i class="fa fa-caret-down"></i></a> - <div class="collapse" id="classification"> - <ul class="nav sidebar-nav"> - <li> <a href="/algorithms/map-reduce/classification/bayesian.html">Bayesian</a></li> - 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<li> <a href="/algorithms/map-reduce/clustering/canopy-clustering.html">Canopy Clustering</a></li> - <li> <a href="/algorithms/map-reduce/clustering/cluster-dumper.html">Cluster Dumper</a></li> - <li> <a href="/algorithms/map-reduce/clustering/expectation-maximization.html">Expectation Maximization</a></li> - <li> <a href="/algorithms/map-reduce/clustering/fuzzy-k-means.html">Fuzzy K-Means</a></li> - <li> <a href="/algorithms/map-reduce/clustering/hierarchical-clustering.html">Hierarchical Clustering</a></li> - <li> <a href="/algorithms/map-reduce/clustering/k-means-clustering.html">K-Means Clustering</a></li> - <li> <a href="/algorithms/map-reduce/clustering/latent-dirichlet-allocation.html">Latent Dirichlet Allocation</a></li> - <li> <a href="/algorithms/map-reduce/clustering/llr---log-likelihood-ratio.html">Log Likelihood Ratio</a></li> - <li> <a href="/algorithms/map-reduce/clustering/spectral-clustering.html">Spectral Clustering</a></li> - <li> <a href="/algorithms/map-reduce/clustering/streaming-k-means.html">Streaming K-Means</a></li> - </ul> - </div> - </div> -</div> + + <!--</ul>--> + </div><!-- /.navbar-collapse --> </div> +</nav> - <div class="col-md-8"> - <div class="page-header"> - <h1>(Deprecated) Collocations </h1> - </div> - <p><a name="Collocations-CollocationsinMahout"></a></p> + <div class="container mt-5 pb-4"> + + <div class="row"> + + <div class="col-lg-8"> + <p><a name="Collocations-CollocationsinMahout"></a></p> <h1 id="collocations-in-mahout">Collocations in Mahout</h1> <p>A collocation is defined as a sequence of words or terms which co-occur @@ -403,7 +260,7 @@ specified LLR score from being emitted, and the âminSupport argument can be used to filter out collocations that appear below a certain number of times.</p> -<pre><code>bin/mahout seq2sparse +<div class="highlighter-rouge"><pre class="highlight"><code>bin/mahout seq2sparse Usage: [--minSupport <minSupport> --analyzerName <analyzerName> --chunkSize <chunkSize> @@ -453,11 +310,12 @@ Options be SequentialAccessVectors If set true else false </code></pre> +</div> <p><a name="Collocations-CollocDriver"></a></p> <h3 id="collocdriver">CollocDriver</h3> -<pre><code>bin/mahout org.apache.mahout.vectorizer.collocations.llr.CollocDriver +<div class="highlighter-rouge"><pre class="highlight"><code>bin/mahout org.apache.mahout.vectorizer.collocations.llr.CollocDriver Usage: [--input <input> --output <output> --maxNGramSize <ngramSize> --overwrite @@ -497,6 +355,7 @@ Options --help (-h) Print out help </code></pre> +</div> <p><a name="Collocations-Algorithmdetails"></a></p> <h2 id="algorithm-details">Algorithm details</h2> @@ -528,7 +387,7 @@ frequencies are collected across the entire document.</p> <p>Once this is done, ngrams are split into head and tail portions. A key of type GramKey is generated which is used later to join ngrams with their heads and tails in the reducer phase. The GramKey is a composite key made up of a string n-gram fragement as the primary key and a secondary key used for grouping and sorting in the reduce phase. The secondary key will either be EMPTY in the case where we are collecting either the head or tail of an ngram as the value or it will contain the byte<a href=".html"></a> form of the ngram when collecting an ngram as the value.</p> -<pre><code>head_key(EMPTY) -> (head subgram, head frequency) +<div class="highlighter-rouge"><pre class="highlight"><code>head_key(EMPTY) -> (head subgram, head frequency) head_key(ngram) -> (ngram, ngram frequency) @@ -536,6 +395,7 @@ tail_key(EMPTY) -> (tail subgram, tail frequency) tail_key(ngram) -> (ngram, ngram frequency) </code></pre> +</div> <p>subgram and ngram values are packaged in Gram objects.</p> @@ -577,7 +437,7 @@ or (subgram_key, ngram) tuple; one from each map task executed in which the particular subgram was found. The input will be traversed in the following order:</p> -<pre><code>(head subgram, frequency 1) +<div class="highlighter-rouge"><pre class="highlight"><code>(head subgram, frequency 1) (head subgram, frequency 2) ... (head subgram, frequency N) @@ -595,6 +455,7 @@ The input will be traversed in the following order:</p> ... (ngram N, frequency N) </code></pre> +</div> <p>Where all of the ngrams above share the same head. Data is presented in the same manner for the tail subgrams.</p> @@ -608,18 +469,20 @@ be incremented.</p> <p>Pairs are passed to the collector in the following format:</p> -<pre><code>ngram, ngram frequency -> subgram subgram frequency +<div class="highlighter-rouge"><pre class="highlight"><code>ngram, ngram frequency -> subgram subgram frequency </code></pre> +</div> <p>In this manner, the output becomes an unsorted version of the following:</p> -<pre><code>ngram 1, frequency -> ngram 1 head, head frequency +<div class="highlighter-rouge"><pre class="highlight"><code>ngram 1, frequency -> ngram 1 head, head frequency ngram 1, frequency -> ngram 1 tail, tail frequency ngram 2, frequency -> ngram 2 head, head frequency ngram 2, frequency -> ngram 2 tail, tail frequency ngram N, frequency -> ngram N head, head frequency ngram N, frequency -> ngram N tail, tail frequency </code></pre> +</div> <p>Output is in the format k:Gram (ngram, frequency), v:Gram (subgram, frequency)</p> @@ -644,11 +507,12 @@ the work for llr calculation is done in the reduce phase.</p> <p>This phase receives the head and tail subgrams and their frequencies for each ngram (with frequency) produced for the input:</p> -<pre><code>ngram 1, frequency -> ngram 1 head, frequency; ngram 1 tail, frequency +<div class="highlighter-rouge"><pre class="highlight"><code>ngram 1, frequency -> ngram 1 head, frequency; ngram 1 tail, frequency ngram 2, frequency -> ngram 2 head, frequency; ngram 2 tail, frequency ... ngram 1, frequency -> ngram N head, frequency; ngram N tail, frequency </code></pre> +</div> <p>It also reads the full ngram count obtained from the first pass, passed in as a configuration option. The parameters to the llr calculation are @@ -677,32 +541,25 @@ subject to filtering with minSupport and minLLR.</p> </div> -</div> - - </div> -</div> - -<div id="footer"> - <div class="container"> - <p>© 2017 Apache Mahout - with help from <a href="http://jekyllbootstrap.com"; target="_blank" title="The Definitive Jekyll Blogging Framework">Jekyll Bootstrap</a> - and <a href="http://getbootstrap.com"; target="_blank">Bootstrap</a> - </p> </div> -</div> - - +</div> + <footer class="footer bg-light"> + <div class="container text-center small"> + Copyright © 2014-2017 The Apache Software Foundation, Licensed under the Apache License, Version 2.0. + </div> +</footer> + <script src="/assets/vendor/jquery/jquery-slim.min.js"></script> + <script src="/assets/vendor/popper/popper.min.js"></script> + <script src="/assets/vendor/bootstrap/js/bootstrap.min.js"></script> + <script src="/assets/header.js"></script> + <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_HTMLorMML"; type="text/javascript"></script> -<!-- Latest compiled and minified JavaScript, requires jQuery 1.x (2.x not supported in IE8) --> -<!-- Placed at the end of the document so the pages load faster --> -<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js";></script> -<script src="/assets/themes/mahout3/js/bootstrap.min.js"></script> </body> -</html> +</html>
