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<title>NGramLanguageModel (Apache OpenNLP Tools 2.3.3 API)</title>
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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">opennlp.tools.languagemodel</a></div>
<h1 title="Class NGramLanguageModel" class="title">Class NGramLanguageModel</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance"><a href="../ngram/NGramModel.html" title="class in opennlp.tools.ngram">opennlp.tools.ngram.NGramModel</a>
<div class="inheritance">opennlp.tools.languagemodel.NGramLanguageModel</div>
</div>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Implemented Interfaces:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Iterable.html" title="class or interface in java.lang" class="external-link">Iterable</a>&lt;<a href="../util/StringList.html" title="class in opennlp.tools.util">StringList</a>&gt;</code>, <code><a href="LanguageModel.html" title="interface in opennlp.tools.languagemodel">LanguageModel</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">NGramLanguageModel</span>
<span class="extends-implements">extends <a href="../ngram/NGramModel.html" title="class in opennlp.tools.ngram">NGramModel</a>
implements <a href="LanguageModel.html" title="interface in opennlp.tools.languagemodel">LanguageModel</a></span></div>
<div class="block">A <a href="LanguageModel.html" title="interface in opennlp.tools.languagemodel"><code>LanguageModel</code></a> based on a <a href="../ngram/NGramModel.html" title="class in opennlp.tools.ngram"><code>NGramModel</code></a> using Stupid Backoff to get
the probabilities of the ngrams.</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<li>
<section class="constructor-summary" id="constructor-summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">NGramLanguageModel</a>()</code></div>
<div class="col-last even-row-color">
<div class="block">Initializes an <a href="NGramLanguageModel.html" title="class in opennlp.tools.languagemodel"><code>NGramLanguageModel</code></a> with <code>DEFAULT_N</code>.</div>
</div>
<div class="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(int)" class="member-name-link">NGramLanguageModel</a><wbr>(int&nbsp;n)</code></div>
<div class="col-last odd-row-color">
<div class="block">Initializes an <a href="NGramLanguageModel.html" title="class in opennlp.tools.languagemodel"><code>NGramLanguageModel</code></a> with the given <code>n</code> for the ngram size.</div>
</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(java.io.InputStream)" class="member-name-link">NGramLanguageModel</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link">InputStream</a>&nbsp;in)</code></div>
<div class="col-last even-row-color">
<div class="block">Initializes a <a href="NGramLanguageModel.html" title="class in opennlp.tools.languagemodel"><code>NGramLanguageModel</code></a> instance via a valid <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link"><code>InputStream</code></a>.</div>
</div>
<div class="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(java.io.InputStream,int)" class="member-name-link">NGramLanguageModel</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link">InputStream</a>&nbsp;in,
int&nbsp;n)</code></div>
<div class="col-last odd-row-color">
<div class="block">Initializes a <a href="NGramLanguageModel.html" title="class in opennlp.tools.languagemodel"><code>NGramLanguageModel</code></a> instance via a valid <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link"><code>InputStream</code></a>.</div>
</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
<div id="method-summary-table.tabpanel" role="tabpanel">
<div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#add(java.lang.String...)" class="member-name-link">add</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>...&nbsp;tokens)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Adds further tokens.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>double</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#calculateProbability(java.lang.String...)" class="member-name-link">calculateProbability</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>...&nbsp;tokens)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Calculate the probability of a series of tokens (e.g. a sentence), given a vocabulary.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>[]</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#predictNextTokens(java.lang.String...)" class="member-name-link">predictNextTokens</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>...&nbsp;tokens)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Predict the most probable output sequence of tokens, given an input sequence of <code>tokens</code>.</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-opennlp.tools.ngram.NGramModel">Methods inherited from class&nbsp;opennlp.tools.ngram.<a href="../ngram/NGramModel.html" title="class in opennlp.tools.ngram">NGramModel</a></h3>
<code><a href="../ngram/NGramModel.html#add(java.lang.CharSequence,int,int)">add</a>, <a href="../ngram/NGramModel.html#add(opennlp.tools.util.StringList)">add</a>, <a href="../ngram/NGramModel.html#add(opennlp.tools.util.StringList,int,int)">add</a>, <a href="../ngram/NGramModel.html#contains(opennlp.tools.util.StringList)">contains</a>, <a href="../ngram/NGramModel.html#cutoff(int,int)">cutoff</a>, <a href="../ngram/NGramModel.html#equals(java.lang.Object)">equals</a>, <a href="../ngram/NGramModel.html#getCount(opennlp.tools.util.StringList)">getCount</a>, <a href="../ngram/NGramModel.html#hashCode()">hashCode</a>, <a href="../ngram/NGramModel.html#iterator()">iterator</a>, <a href="../ngram/NGramModel.html#numberOfGrams()">numberOfGrams</a>, <a href="../ngram/NGramModel.html#remove(opennlp.tools.util.StringList)">remove</a>, <a href="../ngram/NGramModel.html#serialize(java.io.OutputStream)">serialize</a>, <a href="../ngram/NGramModel.html#setCount(opennlp.tools.util.StringList,int)">setCount</a>, <a href="../ngram/NGramModel.html#size()">size</a>, <a href="../ngram/NGramModel.html#toDictionary()">toDictionary</a>, <a href="../ngram/NGramModel.html#toDictionary(boolean)">toDictionary</a>, <a href="../ngram/NGramModel.html#toString()">toString</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Iterable">Methods inherited from interface&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Iterable.html" title="class or interface in java.lang" class="external-link">Iterable</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Iterable.html#forEach(java.util.function.Consumer)" title="class or interface in java.lang" class="external-link">forEach</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Iterable.html#spliterator()" title="class or interface in java.lang" class="external-link">spliterator</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor-detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="&lt;init&gt;()">
<h3>NGramLanguageModel</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">NGramLanguageModel</span>()</div>
<div class="block">Initializes an <a href="NGramLanguageModel.html" title="class in opennlp.tools.languagemodel"><code>NGramLanguageModel</code></a> with <code>DEFAULT_N</code>.</div>
</section>
</li>
<li>
<section class="detail" id="&lt;init&gt;(int)">
<h3>NGramLanguageModel</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">NGramLanguageModel</span><wbr><span class="parameters">(int&nbsp;n)</span></div>
<div class="block">Initializes an <a href="NGramLanguageModel.html" title="class in opennlp.tools.languagemodel"><code>NGramLanguageModel</code></a> with the given <code>n</code> for the ngram size.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>n</code> - The size of the ngrams to be used. Must be greater than <code>0</code>.</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - Thrown if one of the arguments was invalid.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="&lt;init&gt;(java.io.InputStream)">
<h3>NGramLanguageModel</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">NGramLanguageModel</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link">InputStream</a>&nbsp;in)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block">Initializes a <a href="NGramLanguageModel.html" title="class in opennlp.tools.languagemodel"><code>NGramLanguageModel</code></a> instance via a valid <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link"><code>InputStream</code></a>.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>in</code> - The <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link"><code>InputStream</code></a> used for loading the model.</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code> - Thrown if IO errors occurred during initialization.</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - Thrown if one of the arguments was invalid.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="&lt;init&gt;(java.io.InputStream,int)">
<h3>NGramLanguageModel</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">NGramLanguageModel</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link">InputStream</a>&nbsp;in,
int&nbsp;n)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block">Initializes a <a href="NGramLanguageModel.html" title="class in opennlp.tools.languagemodel"><code>NGramLanguageModel</code></a> instance via a valid <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link"><code>InputStream</code></a>.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>in</code> - The <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link"><code>InputStream</code></a> used for loading the model.</dd>
<dd><code>n</code> - The size of the ngrams to be used. Must be greater than <code>0</code>.</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code> - Thrown if IO errors occurred during initialization.</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - Thrown if one of the arguments was invalid.</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="add(java.lang.String...)">
<h3>add</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">add</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>...&nbsp;tokens)</span></div>
<div class="block">Adds further tokens.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>tokens</code> - Text elements to add to the <a href="NGramLanguageModel.html" title="class in opennlp.tools.languagemodel"><code>NGramLanguageModel</code></a>.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="calculateProbability(java.lang.String...)">
<h3>calculateProbability</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">double</span>&nbsp;<span class="element-name">calculateProbability</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>...&nbsp;tokens)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="LanguageModel.html#calculateProbability(java.lang.String...)">LanguageModel</a></code></span></div>
<div class="block">Calculate the probability of a series of tokens (e.g. a sentence), given a vocabulary.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="LanguageModel.html#calculateProbability(java.lang.String...)">calculateProbability</a></code>&nbsp;in interface&nbsp;<code><a href="LanguageModel.html" title="interface in opennlp.tools.languagemodel">LanguageModel</a></code></dd>
<dt>Parameters:</dt>
<dd><code>tokens</code> - the text tokens to calculate the <code>probability</code> for.</dd>
<dt>Returns:</dt>
<dd>the probability of the given text tokens in the vocabulary</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="predictNextTokens(java.lang.String...)">
<h3>predictNextTokens</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>[]</span>&nbsp;<span class="element-name">predictNextTokens</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>...&nbsp;tokens)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="LanguageModel.html#predictNextTokens(java.lang.String...)">LanguageModel</a></code></span></div>
<div class="block">Predict the most probable output sequence of tokens, given an input sequence of <code>tokens</code>.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="LanguageModel.html#predictNextTokens(java.lang.String...)">predictNextTokens</a></code>&nbsp;in interface&nbsp;<code><a href="LanguageModel.html" title="interface in opennlp.tools.languagemodel">LanguageModel</a></code></dd>
<dt>Parameters:</dt>
<dd><code>tokens</code> - a sequence of tokens</dd>
<dt>Returns:</dt>
<dd>the most probable subsequent token sequence</dd>
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