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Posted to commits@datafu.apache.org by mh...@apache.org on 2016/08/10 22:07:31 UTC
svn commit: r1755883 [23/49] - in /incubator/datafu/site: ./ blog/
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Added: incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EmpiricalCountEntropy.Initial.html
URL: http://svn.apache.org/viewvc/incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EmpiricalCountEntropy.Initial.html?rev=1755883&view=auto
==============================================================================
--- incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EmpiricalCountEntropy.Initial.html (added)
+++ incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EmpiricalCountEntropy.Initial.html Wed Aug 10 22:07:27 2016
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+<title>EmpiricalCountEntropy.Initial (datafu-pig 1.3.1 API)</title>
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+<li><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.Intermediate.html" title="class in datafu.pig.stats.entropy"><span class="strong">Next Class</span></a></li>
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+<div>
+<ul class="subNavList">
+<li>Summary: </li>
+<li><a href="#nested_classes_inherited_from_class_org.apache.pig.EvalFunc">Nested</a> | </li>
+<li><a href="#fields_inherited_from_class_org.apache.pig.EvalFunc">Field</a> | </li>
+<li><a href="#constructor_summary">Constr</a> | </li>
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+<li>Detail: </li>
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+<!-- ======== START OF CLASS DATA ======== -->
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+<div class="subTitle">datafu.pig.stats.entropy</div>
+<h2 title="Class EmpiricalCountEntropy.Initial" class="title">Class EmpiricalCountEntropy.Initial</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.pig.EvalFunc<org.apache.pig.data.Tuple></li>
+<li>
+<ul class="inheritance">
+<li>datafu.pig.stats.entropy.EmpiricalCountEntropy.Initial</li>
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+</ul>
+<div class="description">
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+<dt>Enclosing class:</dt>
+<dd><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html" title="class in datafu.pig.stats.entropy">EmpiricalCountEntropy</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public static class <span class="strong">EmpiricalCountEntropy.Initial</span>
+extends org.apache.pig.EvalFunc<org.apache.pig.data.Tuple></pre>
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+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.Initial.html#EmpiricalCountEntropy.Initial()">EmpiricalCountEntropy.Initial</a></strong>()</code> </td>
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+</tr>
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+<td class="colFirst"><code>org.apache.pig.data.Tuple</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.Initial.html#exec(org.apache.pig.data.Tuple)">exec</a></strong>(org.apache.pig.data.Tuple input)</code> </td>
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+<dt><strong>Specified by:</strong></dt>
+<dd><code>exec</code> in class <code>org.apache.pig.EvalFunc<org.apache.pig.data.Tuple></code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code>java.io.IOException</code></dd></dl>
+</li>
+</ul>
+</li>
+</ul>
+</li>
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+<!-- -->
+</a><a href="#skip-navbar_bottom" title="Skip navigation links"></a><a name="navbar_bottom_firstrow">
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+</ul>
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+<div class="subNav">
+<ul class="navList">
+<li><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.Final.html" title="class in datafu.pig.stats.entropy"><span class="strong">Prev Class</span></a></li>
+<li><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.Intermediate.html" title="class in datafu.pig.stats.entropy"><span class="strong">Next Class</span></a></li>
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+<li><a href="EmpiricalCountEntropy.Initial.html" target="_top">No Frames</a></li>
+</ul>
+<ul class="navList" id="allclasses_navbar_bottom">
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+ allClassesLink.style.display = "block";
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+ else {
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+ //-->
+</script>
+</div>
+<div>
+<ul class="subNavList">
+<li>Summary: </li>
+<li><a href="#nested_classes_inherited_from_class_org.apache.pig.EvalFunc">Nested</a> | </li>
+<li><a href="#fields_inherited_from_class_org.apache.pig.EvalFunc">Field</a> | </li>
+<li><a href="#constructor_summary">Constr</a> | </li>
+<li><a href="#method_summary">Method</a></li>
+</ul>
+<ul class="subNavList">
+<li>Detail: </li>
+<li>Field | </li>
+<li><a href="#constructor_detail">Constr</a> | </li>
+<li><a href="#method_detail">Method</a></li>
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+</html>
Added: incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EmpiricalCountEntropy.Intermediate.html
URL: http://svn.apache.org/viewvc/incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EmpiricalCountEntropy.Intermediate.html?rev=1755883&view=auto
==============================================================================
--- incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EmpiricalCountEntropy.Intermediate.html (added)
+++ incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EmpiricalCountEntropy.Intermediate.html Wed Aug 10 22:07:27 2016
@@ -0,0 +1,318 @@
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+<!-- NewPage -->
+<html lang="en">
+<head>
+<!-- Generated by javadoc (version 1.7.0_79) on Wed Aug 10 15:01:03 PDT 2016 -->
+<title>EmpiricalCountEntropy.Intermediate (datafu-pig 1.3.1 API)</title>
+<meta name="date" content="2016-08-10">
+<link rel="stylesheet" type="text/css" href="../../../../stylesheet.css" title="Style">
+</head>
+<body>
+<script type="text/javascript"><!--
+ if (location.href.indexOf('is-external=true') == -1) {
+ parent.document.title="EmpiricalCountEntropy.Intermediate (datafu-pig 1.3.1 API)";
+ }
+//-->
+</script>
+<noscript>
+<div>JavaScript is disabled on your browser.</div>
+</noscript>
+<!-- ========= START OF TOP NAVBAR ======= -->
+<div class="topNav"><a name="navbar_top">
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+<li><a href="../../../../overview-summary.html">Overview</a></li>
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+<li class="navBarCell1Rev">Class</li>
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+<li><a href="../../../../deprecated-list.html">Deprecated</a></li>
+<li><a href="../../../../index-all.html">Index</a></li>
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+</ul>
+</div>
+<div class="subNav">
+<ul class="navList">
+<li><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.Initial.html" title="class in datafu.pig.stats.entropy"><span class="strong">Prev Class</span></a></li>
+<li><a href="../../../../datafu/pig/stats/entropy/Entropy.html" title="class in datafu.pig.stats.entropy"><span class="strong">Next Class</span></a></li>
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+ else {
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+ //-->
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+</div>
+<div>
+<ul class="subNavList">
+<li>Summary: </li>
+<li><a href="#nested_classes_inherited_from_class_org.apache.pig.EvalFunc">Nested</a> | </li>
+<li><a href="#fields_inherited_from_class_org.apache.pig.EvalFunc">Field</a> | </li>
+<li><a href="#constructor_summary">Constr</a> | </li>
+<li><a href="#method_summary">Method</a></li>
+</ul>
+<ul class="subNavList">
+<li>Detail: </li>
+<li>Field | </li>
+<li><a href="#constructor_detail">Constr</a> | </li>
+<li><a href="#method_detail">Method</a></li>
+</ul>
+</div>
+<a name="skip-navbar_top">
+<!-- -->
+</a></div>
+<!-- ========= END OF TOP NAVBAR ========= -->
+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">datafu.pig.stats.entropy</div>
+<h2 title="Class EmpiricalCountEntropy.Intermediate" class="title">Class EmpiricalCountEntropy.Intermediate</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.pig.EvalFunc<org.apache.pig.data.Tuple></li>
+<li>
+<ul class="inheritance">
+<li>datafu.pig.stats.entropy.EmpiricalCountEntropy.Intermediate</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
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+<dt>Enclosing class:</dt>
+<dd><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html" title="class in datafu.pig.stats.entropy">EmpiricalCountEntropy</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public static class <span class="strong">EmpiricalCountEntropy.Intermediate</span>
+extends org.apache.pig.EvalFunc<org.apache.pig.data.Tuple></pre>
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+<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
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+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.Intermediate.html#EmpiricalCountEntropy.Intermediate()">EmpiricalCountEntropy.Intermediate</a></strong>()</code> </td>
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+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
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+<code>allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, outputSchema, progress, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warn</code></li>
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+ throws java.io.IOException</pre>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>exec</code> in class <code>org.apache.pig.EvalFunc<org.apache.pig.data.Tuple></code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code>java.io.IOException</code></dd></dl>
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+++ incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EmpiricalCountEntropy.html Wed Aug 10 22:07:27 2016
@@ -0,0 +1,573 @@
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+<div class="subTitle">datafu.pig.stats.entropy</div>
+<h2 title="Class EmpiricalCountEntropy" class="title">Class EmpiricalCountEntropy</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.pig.EvalFunc<T></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.pig.AccumulatorEvalFunc<java.lang.Double></li>
+<li>
+<ul class="inheritance">
+<li>datafu.pig.stats.entropy.EmpiricalCountEntropy</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd>org.apache.pig.Accumulator<java.lang.Double>, org.apache.pig.Algebraic</dd>
+</dl>
+<hr>
+<br>
+<pre>public class <span class="strong">EmpiricalCountEntropy</span>
+extends org.apache.pig.AccumulatorEvalFunc<java.lang.Double>
+implements org.apache.pig.Algebraic</pre>
+<div class="block">Calculate the empirical entropy of random variable X given its occurrence frequencies, following entropy's
+ <a href="http://en.wikipedia.org/wiki/Entropy_%28information_theory%29" target="_blank">wiki definition</a>.
+
+ <p>
+ This UDF's constructor takes 1 argument: the logarithm base, whose definition is the same as that defined in <a href="../../../../datafu/pig/stats/entropy/Entropy.html" title="class in datafu.pig.stats.entropy"><code>Entropy</code></a>
+ </p>
+
+ Note:
+ <ul>
+ <li>Unlike <a href="../../../../datafu/pig/stats/entropy/Entropy.html" title="class in datafu.pig.stats.entropy"><code>Entropy</code></a>, which calculates entropy from sorted raw data bag in accumulative mode,
+ this UDF calculates entropy from the data's occurrence frequencies which does not need to be sorted, either in accumulative or algebraic mode.</li>
+ <li>Each tuple of the UDF's input bag <b>must only</b> have 1 field, the occurrence frequency of a data instance,
+ and the data type of this field <b>must</b> be int or long. Otherwise, an exception will be thrown.</li>
+ <li>Negative frequency number will be silently discarded and a warning message will be logged in the job's log file.</li>
+ <li>The returned entropy value is of double type.</li>
+ </ul>
+
+ <p>
+ How to use:
+ </p>
+
+ <p>
+ To use this UDF, customer needs to pre-compute the occurrence frequency of each data instance, often in an outer GROUP BY
+ , and then use this UDF to calculate entropy with those frequency numbers in another outer GROUP BY.
+ </p>
+
+ <p>
+ Compared with <a href="../../../../datafu/pig/stats/entropy/Entropy.html" title="class in datafu.pig.stats.entropy"><code>Entropy</code></a>, this UDF is more scalable when we need to handle a very large data set,
+ since it could distribute computation onto mappers and take advantage of combiners to reduce intermedidate output from mappers to reducers.
+ </p>
+
+ Example:
+ <pre>
+ <code>define Entropy datafu.pig.stats.entropy.EmpiricalCountEntropy();
+
+ input = LOAD 'input' AS (val: double);
+
+ -- calculate the occurrence of each instance
+ counts_g = GROUP input BY val;
+ counts = FOREACh counts_g GENERATE COUNT(input) AS cnt;
+
+ -- calculate entropy
+ input_counts_g = GROUP counts ALL;
+ entropy = FOREACH input_counts_g GENERATE Entropy(counts) AS entropy;
+ </code>
+ </pre>
+
+ Use case to calculate mutual information using EmpiricalCountEntropy:
+
+ <pre>
+ <code>define Entropy datafu.pig.stats.entropy.EmpiricalCountEntropy();
+
+ input = LOAD 'input' AS (valX: double, valY: double);
+
+ ------------
+ -- calculate mutual information I(X, Y) using entropy
+ -- I(X, Y) = H(X) + H(Y) - H(X, Y)
+ ------------
+
+ input_x_y_g = GROUP input BY (valX, valY);
+ input_x_y_cnt = FOREACH input_x_y_g GENERATE flatten(group) as (valX, valY), COUNT(input) AS cnt;
+
+ input_x_g = GROUP input_x_y_cnt BY valX;
+ input_x_cnt = FOREACH input_x_g GENERATE flatten(group) as valX, SUM(input_x_y_cnt.cnt) AS cnt;
+
+ input_y_g = GROUP input_x_y_cnt BY valY;
+ input_y_cnt = FOREACH input_y_g GENERATE flatten(group) as valY, SUM(input_x_y_cnt.cnt) AS cnt;
+
+ input_x_y_entropy_g = GROUP input_x_y_cnt ALL;
+ input_x_y_entropy = FOREACH input_x_y_entropy_g {
+ input_x_y_entropy_cnt = input_x_y_cnt.cnt;
+ GENERATE Entropy(input_x_y_entropy_cnt) AS x_y_entropy;
+ }
+
+ input_x_entropy_g = GROUP input_x_cnt ALL;
+ input_x_entropy = FOREACH input_x_entropy_g {
+ input_x_entropy_cnt = input_x_cnt.cnt;
+ GENERATE Entropy(input_x_entropy_cnt) AS x_entropy;
+ }
+
+ input_y_entropy_g = GROUP input_y_cnt ALL;
+ input_y_entropy = FOREACH input_y_entropy_g {
+ input_y_entropy_cnt = input_y_cnt.cnt;
+ GENERATE Entropy(input_y_entropy_cnt) AS y_entropy;
+ }
+
+ input_mi_cross = CROSS input_x_y_entropy, input_x_entropy, input_y_entropy;
+ input_mi = FOREACH input_mi_cross GENERATE (input_x_entropy::x_entropy +
+ input_y_entropy::y_entropy -
+ input_x_y_entropy::x_y_entropy) AS mi;
+ </code>
+ </pre></div>
+<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../datafu/pig/stats/entropy/Entropy.html" title="class in datafu.pig.stats.entropy"><code>Entropy</code></a></dd></dl>
+</li>
+</ul>
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+<caption><span>Nested Classes</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Class and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static class </code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.Final.html" title="class in datafu.pig.stats.entropy">EmpiricalCountEntropy.Final</a></strong></code> </td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static class </code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.Initial.html" title="class in datafu.pig.stats.entropy">EmpiricalCountEntropy.Initial</a></strong></code> </td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static class </code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.Intermediate.html" title="class in datafu.pig.stats.entropy">EmpiricalCountEntropy.Intermediate</a></strong></code> </td>
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+<!-- -->
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+<h3>Nested classes/interfaces inherited from class org.apache.pig.EvalFunc</h3>
+<code>org.apache.pig.EvalFunc.SchemaType</code></li>
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+<!-- -->
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+<h3>Fields inherited from class org.apache.pig.EvalFunc</h3>
+<code>log, pigLogger, reporter, returnType</code></li>
+</ul>
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+<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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+<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html#EmpiricalCountEntropy()">EmpiricalCountEntropy</a></strong>()</code> </td>
+</tr>
+<tr class="rowColor">
+<td class="colOne"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html#EmpiricalCountEntropy(java.lang.String)">EmpiricalCountEntropy</a></strong>(java.lang.String base)</code> </td>
+</tr>
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+<!-- ========== METHOD SUMMARY =========== -->
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+<caption><span>Methods</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html#accumulate(org.apache.pig.data.Tuple)">accumulate</a></strong>(org.apache.pig.data.Tuple input)</code> </td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html#cleanup()">cleanup</a></strong>()</code> </td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected static org.apache.pig.data.Tuple</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html#combine(org.apache.pig.data.DataBag)">combine</a></strong>(org.apache.pig.data.DataBag values)</code> </td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>java.lang.String</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html#getFinal()">getFinal</a></strong>()</code> </td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>java.lang.String</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html#getInitial()">getInitial</a></strong>()</code> </td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>java.lang.String</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html#getIntermed()">getIntermed</a></strong>()</code> </td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>java.lang.Double</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html#getValue()">getValue</a></strong>()</code> </td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>org.apache.pig.impl.logicalLayer.schema.Schema</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html#outputSchema(org.apache.pig.impl.logicalLayer.schema.Schema)">outputSchema</a></strong>(org.apache.pig.impl.logicalLayer.schema.Schema input)</code> </td>
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+<!-- -->
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+<h3>Methods inherited from class org.apache.pig.AccumulatorEvalFunc</h3>
+<code>exec</code></li>
+</ul>
+<ul class="blockList">
+<li class="blockList"><a name="methods_inherited_from_class_org.apache.pig.EvalFunc">
+<!-- -->
+</a>
+<h3>Methods inherited from class org.apache.pig.EvalFunc</h3>
+<code>allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, progress, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warn</code></li>
+</ul>
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+<!-- -->
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+<h3>Methods inherited from class java.lang.Object</h3>
+<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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+<!-- ========= CONSTRUCTOR DETAIL ======== -->
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+<h3>Constructor Detail</h3>
+<a name="EmpiricalCountEntropy()">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>EmpiricalCountEntropy</h4>
+<pre>public EmpiricalCountEntropy()
+ throws org.apache.pig.backend.executionengine.ExecException</pre>
+<dl><dt><span class="strong">Throws:</span></dt>
+<dd><code>org.apache.pig.backend.executionengine.ExecException</code></dd></dl>
+</li>
+</ul>
+<a name="EmpiricalCountEntropy(java.lang.String)">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>EmpiricalCountEntropy</h4>
+<pre>public EmpiricalCountEntropy(java.lang.String base)
+ throws org.apache.pig.backend.executionengine.ExecException</pre>
+<dl><dt><span class="strong">Throws:</span></dt>
+<dd><code>org.apache.pig.backend.executionengine.ExecException</code></dd></dl>
+</li>
+</ul>
+</li>
+</ul>
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
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+<!-- -->
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+<ul class="blockList">
+<li class="blockList">
+<h4>getFinal</h4>
+<pre>public java.lang.String getFinal()</pre>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>getFinal</code> in interface <code>org.apache.pig.Algebraic</code></dd>
+</dl>
+</li>
+</ul>
+<a name="getInitial()">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>getInitial</h4>
+<pre>public java.lang.String getInitial()</pre>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>getInitial</code> in interface <code>org.apache.pig.Algebraic</code></dd>
+</dl>
+</li>
+</ul>
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+<pre>protected static org.apache.pig.data.Tuple combine(org.apache.pig.data.DataBag values)
+ throws org.apache.pig.backend.executionengine.ExecException</pre>
+<dl><dt><span class="strong">Throws:</span></dt>
+<dd><code>org.apache.pig.backend.executionengine.ExecException</code></dd></dl>
+</li>
+</ul>
+<a name="accumulate(org.apache.pig.data.Tuple)">
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+ throws java.io.IOException</pre>
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+<dt><strong>Specified by:</strong></dt>
+<dd><code>accumulate</code> in interface <code>org.apache.pig.Accumulator<java.lang.Double></code></dd>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>accumulate</code> in class <code>org.apache.pig.AccumulatorEvalFunc<java.lang.Double></code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code>java.io.IOException</code></dd></dl>
+</li>
+</ul>
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+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>getValue</code> in interface <code>org.apache.pig.Accumulator<java.lang.Double></code></dd>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>getValue</code> in class <code>org.apache.pig.AccumulatorEvalFunc<java.lang.Double></code></dd>
+</dl>
+</li>
+</ul>
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+<pre>public void cleanup()</pre>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>cleanup</code> in interface <code>org.apache.pig.Accumulator<java.lang.Double></code></dd>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>cleanup</code> in class <code>org.apache.pig.AccumulatorEvalFunc<java.lang.Double></code></dd>
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+<dl>
+<dt><strong>Overrides:</strong></dt>
+<dd><code>outputSchema</code> in class <code>org.apache.pig.EvalFunc<java.lang.Double></code></dd>
+</dl>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
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Added: incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/Entropy.html
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+++ incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/Entropy.html Wed Aug 10 22:07:27 2016
@@ -0,0 +1,478 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<!-- NewPage -->
+<html lang="en">
+<head>
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+<title>Entropy (datafu-pig 1.3.1 API)</title>
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+<li><a href="#method_summary">Method</a></li>
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+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">datafu.pig.stats.entropy</div>
+<h2 title="Class Entropy" class="title">Class Entropy</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.pig.EvalFunc<T></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.pig.AccumulatorEvalFunc<java.lang.Double></li>
+<li>
+<ul class="inheritance">
+<li>datafu.pig.stats.entropy.Entropy</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd>org.apache.pig.Accumulator<java.lang.Double></dd>
+</dl>
+<hr>
+<br>
+<pre>public class <span class="strong">Entropy</span>
+extends org.apache.pig.AccumulatorEvalFunc<java.lang.Double></pre>
+<div class="block">Calculate entropy H(X) of random variable X following entropy's
+ <a href="http://en.wikipedia.org/wiki/Entropy_%28information_theory%29" target="_blank">wiki definition</a>
+
+ <p>
+ This UDF's constructor takes 2 arguments.
+ </p>
+
+ The 1st argument, the type of entropy estimator algorithm we currently support, includes:
+ <ul>
+ <li>empirical (empirical entropy estimator)
+ <li>chaosh (Chao-Shen entropy estimator)
+ </ul>
+
+ <p>
+ The default estimation algorithm is empirical.
+ </p>
+
+ <p>
+ The 2nd argument, the logarithm base we currently support, includes:
+ </p>
+
+ <ul>
+ <li>log (use Euler's number as the logarithm base)
+ <li>log2 (use 2 as the logarithm base)
+ <li>log10 (use 10 as the logarithm base)
+ </ul>
+
+ <p>
+ The default logarithm base is log.
+ </p>
+
+ Note:
+ <ul>
+ <li>The input to this UDF must be a <b>sorted</b> bag of raw data tuples of X.
+ An exception will be thrown if the input bag is not sorted
+ <li>The returned entropy value is of double type.
+ </ul>
+
+ <p>
+ How to use:
+ </p>
+
+ <p>
+ This UDF calculates entropy from raw data tuples without the need to pre-compute per tuple occurrence frequency.
+ </p>
+
+ <p>
+ It could be used in a nested FOREACH after a GROUP BY, in which we sort the inner bag and use the sorted bag as this UDF's input.
+ </p>
+
+ Example:
+ <pre>
+ <code>--calculate empirical entropy with Euler's number as the logarithm base
+ define Entropy datafu.pig.stats.entropy.Entropy();
+
+ input = LOAD 'input' AS (grp: chararray, val: double);
+
+ -- calculate the input's entropy in each group
+ input_group_g = GROUP input BY grp;
+ entropy_group = FOREACH input_group_g {
+ input_val = input.val;
+ input_ordered = ORDER input_val BY $0;
+ GENERATE FLATTEN(group) AS group, Entropy(input_ordered) AS entropy;
+ }
+ </code>
+ </pre></div>
+<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../datafu/pig/stats/entropy/CondEntropy.html" title="class in datafu.pig.stats.entropy"><code>CondEntropy</code></a>,
+<a href="../../../../datafu/pig/stats/entropy/EmpiricalCountEntropy.html" title="class in datafu.pig.stats.entropy"><code>EmpiricalCountEntropy</code></a></dd></dl>
+</li>
+</ul>
+</div>
+<div class="summary">
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+<li class="blockList">
+<!-- ======== NESTED CLASS SUMMARY ======== -->
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+<!-- -->
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+<h3>Nested classes/interfaces inherited from class org.apache.pig.EvalFunc</h3>
+<code>org.apache.pig.EvalFunc.SchemaType</code></li>
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+<h3>Constructor Summary</h3>
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+<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><strong><a href="../../../../datafu/pig/stats/entropy/Entropy.html#Entropy()">Entropy</a></strong>()</code> </td>
+</tr>
+<tr class="rowColor">
+<td class="colOne"><code><strong><a href="../../../../datafu/pig/stats/entropy/Entropy.html#Entropy(java.lang.String)">Entropy</a></strong>(java.lang.String type)</code> </td>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><strong><a href="../../../../datafu/pig/stats/entropy/Entropy.html#Entropy(java.lang.String,%20java.lang.String)">Entropy</a></strong>(java.lang.String type,
+ java.lang.String base)</code> </td>
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+</a>
+<h3>Method Summary</h3>
+<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<caption><span>Methods</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/Entropy.html#accumulate(org.apache.pig.data.Tuple)">accumulate</a></strong>(org.apache.pig.data.Tuple input)</code> </td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/Entropy.html#cleanup()">cleanup</a></strong>()</code> </td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>java.lang.Double</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/Entropy.html#getValue()">getValue</a></strong>()</code> </td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>org.apache.pig.impl.logicalLayer.schema.Schema</code></td>
+<td class="colLast"><code><strong><a href="../../../../datafu/pig/stats/entropy/Entropy.html#outputSchema(org.apache.pig.impl.logicalLayer.schema.Schema)">outputSchema</a></strong>(org.apache.pig.impl.logicalLayer.schema.Schema input)</code> </td>
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+<!-- -->
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+<h3>Methods inherited from class org.apache.pig.EvalFunc</h3>
+<code>allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, progress, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warn</code></li>
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+</ul>
+</li>
+</ul>
+</li>
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+<div class="details">
+<ul class="blockList">
+<li class="blockList">
+<!-- ========= CONSTRUCTOR DETAIL ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor_detail">
+<!-- -->
+</a>
+<h3>Constructor Detail</h3>
+<a name="Entropy()">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>Entropy</h4>
+<pre>public Entropy()
+ throws org.apache.pig.backend.executionengine.ExecException</pre>
+<dl><dt><span class="strong">Throws:</span></dt>
+<dd><code>org.apache.pig.backend.executionengine.ExecException</code></dd></dl>
+</li>
+</ul>
+<a name="Entropy(java.lang.String)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>Entropy</h4>
+<pre>public Entropy(java.lang.String type)
+ throws org.apache.pig.backend.executionengine.ExecException</pre>
+<dl><dt><span class="strong">Throws:</span></dt>
+<dd><code>org.apache.pig.backend.executionengine.ExecException</code></dd></dl>
+</li>
+</ul>
+<a name="Entropy(java.lang.String, java.lang.String)">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>Entropy</h4>
+<pre>public Entropy(java.lang.String type,
+ java.lang.String base)
+ throws org.apache.pig.backend.executionengine.ExecException</pre>
+<dl><dt><span class="strong">Throws:</span></dt>
+<dd><code>org.apache.pig.backend.executionengine.ExecException</code></dd></dl>
+</li>
+</ul>
+</li>
+</ul>
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method_detail">
+<!-- -->
+</a>
+<h3>Method Detail</h3>
+<a name="accumulate(org.apache.pig.data.Tuple)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>accumulate</h4>
+<pre>public void accumulate(org.apache.pig.data.Tuple input)
+ throws java.io.IOException</pre>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>accumulate</code> in interface <code>org.apache.pig.Accumulator<java.lang.Double></code></dd>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>accumulate</code> in class <code>org.apache.pig.AccumulatorEvalFunc<java.lang.Double></code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code>java.io.IOException</code></dd></dl>
+</li>
+</ul>
+<a name="getValue()">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>getValue</h4>
+<pre>public java.lang.Double getValue()</pre>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>getValue</code> in interface <code>org.apache.pig.Accumulator<java.lang.Double></code></dd>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>getValue</code> in class <code>org.apache.pig.AccumulatorEvalFunc<java.lang.Double></code></dd>
+</dl>
+</li>
+</ul>
+<a name="cleanup()">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>cleanup</h4>
+<pre>public void cleanup()</pre>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>cleanup</code> in interface <code>org.apache.pig.Accumulator<java.lang.Double></code></dd>
+<dt><strong>Specified by:</strong></dt>
+<dd><code>cleanup</code> in class <code>org.apache.pig.AccumulatorEvalFunc<java.lang.Double></code></dd>
+</dl>
+</li>
+</ul>
+<a name="outputSchema(org.apache.pig.impl.logicalLayer.schema.Schema)">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>outputSchema</h4>
+<pre>public org.apache.pig.impl.logicalLayer.schema.Schema outputSchema(org.apache.pig.impl.logicalLayer.schema.Schema input)</pre>
+<dl>
+<dt><strong>Overrides:</strong></dt>
+<dd><code>outputSchema</code> in class <code>org.apache.pig.EvalFunc<java.lang.Double></code></dd>
+</dl>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
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Added: incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EntropyEstimator.html
URL: http://svn.apache.org/viewvc/incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EntropyEstimator.html?rev=1755883&view=auto
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+++ incubator/datafu/site/docs/datafu/1.3.1/datafu/pig/stats/entropy/EntropyEstimator.html Wed Aug 10 22:07:27 2016
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+<li><a href="#method_summary">Method</a></li>
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+<li>Detail: </li>
+<li><a href="#field_detail">Field</a> | </li>
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+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">datafu.pig.stats.entropy</div>
+<h2 title="Class EntropyEstimator" class="title">Class EntropyEstimator</h2>
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+<td class="colFirst"><code>protected java.lang.String</code></td>
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+<li><a href="../../../../deprecated-list.html">Deprecated</a></li>
+<li><a href="../../../../index-all.html">Index</a></li>
+<li><a href="../../../../help-doc.html">Help</a></li>
+</ul>
+</div>
+<div class="subNav">
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+<li><a href="../../../../datafu/pig/stats/entropy/Entropy.html" title="class in datafu.pig.stats.entropy"><span class="strong">Prev Class</span></a></li>
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