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<!DOCTYPE HTML>
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<div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.sysds.utils</a></div>
<h2 title="Class Hash" class="title">Class Hash</h2>
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<pre>public class <span class="typeNameLabel">Hash</span>
extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></pre>
<div class="block">A class containing different hashing functions.</div>
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<td class="colFirst"><code>static class </code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Hash.HashType.html" title="enum in org.apache.sysds.utils">Hash.HashType</a></span></code></th>
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<div class="block">Available Hashing techniques</div>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">Hash</a></span>()</code></th>
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<td class="colFirst"><code>static byte</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#expHash(int)">expHash</a></span>​(int x)</code></th>
<td class="colLast">
<div class="block">Compute exponentially distributed hash values in range 0..a.length
eg: 50% == 0 , 25% == 1 12.5 % == 2 etc.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hash(double,org.apache.sysds.utils.Hash.HashType)">hash</a></span>​(double o,
<a href="Hash.HashType.html" title="enum in org.apache.sysds.utils">Hash.HashType</a> ht)</code></th>
<td class="colLast">
<div class="block">Hash functions for double values.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hash(java.lang.Object,org.apache.sysds.utils.Hash.HashType)">hash</a></span>​(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a> o,
<a href="Hash.HashType.html" title="enum in org.apache.sysds.utils">Hash.HashType</a> ht)</code></th>
<td class="colLast">
<div class="block">Generic hashing of java objects, not ideal for specific values so use the specific methods for specific types.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#linearHash(int)">linearHash</a></span>​(int v)</code></th>
<td class="colLast">
<div class="block">Compute the Linear hash of an int input value.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#linearHash(int,int)">linearHash</a></span>​(int v,
int bits)</code></th>
<td class="colLast">
<div class="block">Compute the Linear hash of an int input value, but only use the first bits of the linear hash.</div>
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<h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink">wait</a></code></li>
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<h4>Hash</h4>
<pre>public Hash()</pre>
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<h4>hash</h4>
<pre class="methodSignature">public static int hash​(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a> o,
<a href="Hash.HashType.html" title="enum in org.apache.sysds.utils">Hash.HashType</a> ht)</pre>
<div class="block">Generic hashing of java objects, not ideal for specific values so use the specific methods for specific types.
To Use the locality sensitive techniques override the objects hashcode function.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>o</code> - The Object to hash.</dd>
<dd><code>ht</code> - The HashType to use.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An int Hash value.</dd>
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<h4>hash</h4>
<pre class="methodSignature">public static int hash​(double o,
<a href="Hash.HashType.html" title="enum in org.apache.sysds.utils">Hash.HashType</a> ht)</pre>
<div class="block">Hash functions for double values.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>o</code> - The double value.</dd>
<dd><code>ht</code> - The hashing function to apply.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An int Hash value.</dd>
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<h4>linearHash</h4>
<pre class="methodSignature">public static int linearHash​(int v)</pre>
<div class="block">Compute the Linear hash of an int input value.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>v</code> - The value to hash.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The int hash.</dd>
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<h4>linearHash</h4>
<pre class="methodSignature">public static int linearHash​(int v,
int bits)</pre>
<div class="block">Compute the Linear hash of an int input value, but only use the first bits of the linear hash.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>v</code> - The value to hash.</dd>
<dd><code>bits</code> - The number of bits to use. up to maximum of 32.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The hashed value</dd>
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<h4>expHash</h4>
<pre class="methodSignature">public static byte expHash​(int x)</pre>
<div class="block">Compute exponentially distributed hash values in range 0..a.length
eg: 50% == 0 , 25% == 1 12.5 % == 2 etc.
Useful because you can estimate size of a collection by only maintaining the highest value found. from this hash.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>x</code> - value to hash</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a hash value byte (only in the range of 0 to a.length)</dd>
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