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<div class="subTitle">org.apache.sysds.runtime.compress.colgroup</div>
<h2 title="Class ColGroup" class="title">Class ColGroup</h2>
</div>
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<ul class="inheritance">
<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li>org.apache.sysds.runtime.compress.colgroup.ColGroup</li>
</ul>
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</ul>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroupUncompressed.html" title="class in org.apache.sysds.runtime.compress.colgroup">ColGroupUncompressed</a>, <a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroupValue.html" title="class in org.apache.sysds.runtime.compress.colgroup">ColGroupValue</a></dd>
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<pre>public abstract class <span class="typeNameLabel">ColGroup</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre>
<div class="block">Class that stores information about a column group within a compressed matrix block. There are subclasses specific to
each compression type.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../serialized-form.html#org.apache.sysds.runtime.compress.colgroup.ColGroup">Serialized Form</a></dd>
</dl>
</li>
</ul>
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<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</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>protected class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.ColGroupRowIterator.html" title="class in org.apache.sysds.runtime.compress.colgroup">ColGroup.ColGroupRowIterator</a></span></code>
<div class="block">Base class for column group row iterators.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.ColGroupType.html" title="enum in org.apache.sysds.runtime.compress.colgroup">ColGroup.ColGroupType</a></span></code>
<div class="block">Concrete ColGroupType
Protected such that outside the ColGroup package it should be unknown which specific subtype is used.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.CompressionType.html" title="enum in org.apache.sysds.runtime.compress.colgroup">ColGroup.CompressionType</a></span></code>
<div class="block">Public Group types supported
Note For instance DDC is called DDC not DDC1, or DDC2 which is a specific subtype of the DDC.</div>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<td class="colFirst"><code>protected int[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#Z:Z_colIndexes">_colIndexes</a></span></code>
<div class="block">The ColGroup Indexes 0 offset, contained in the ColGroup</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#Z:Z_numRows">_numRows</a></span></code>
<div class="block">Number of rows in the matrix, for use by child classes.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#Z:Z_zeros">_zeros</a></span></code>
<div class="block">ColGroup Implementation Contains zero values</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected static org.apache.commons.logging.Log</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#LOG">LOG</a></span></code>&nbsp;</td>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier</th>
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<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#ColGroup--">ColGroup</a></span>()</code>
<div class="block">Empty constructor, used for serializing into an empty new object of ColGroup.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#ColGroup-int:A-int-">ColGroup</a></span>(int[]&nbsp;colIndices,
int&nbsp;numRows)</code>
<div class="block">Main constructor.</div>
</td>
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<h3>Method Summary</h3>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#countNonZerosPerRow-int:A-int-int-">countNonZerosPerRow</a></span>(int[]&nbsp;rnnz,
int&nbsp;rl,
int&nbsp;ru)</code>
<div class="block">Count the number of non-zeros per row</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#decompressToBlock-org.apache.sysds.runtime.matrix.data.MatrixBlock-int-">decompressToBlock</a></span>(<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;target,
int&nbsp;colpos)</code>
<div class="block">Decompress to block.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#decompressToBlock-org.apache.sysds.runtime.matrix.data.MatrixBlock-int:A-">decompressToBlock</a></span>(<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;target,
int[]&nbsp;colIndexTargets)</code>
<div class="block">Decompress the contents of this column group into uncompressed packed columns</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#decompressToBlock-org.apache.sysds.runtime.matrix.data.MatrixBlock-int-int-">decompressToBlock</a></span>(<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;target,
int&nbsp;rl,
int&nbsp;ru)</code>
<div class="block">Decompress the contents of this column group into the specified full matrix block.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#estimateInMemorySize--">estimateInMemorySize</a></span>()</code>
<div class="block">Note: Must be overridden by child classes to account for additional data and metadata</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>abstract double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#get-int-int-">get</a></span>(int&nbsp;r,
int&nbsp;c)</code>
<div class="block">Get the value at a global row/column position.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>protected abstract <a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.ColGroupType.html" title="enum in org.apache.sysds.runtime.compress.colgroup">ColGroup.ColGroupType</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#getColGroupType--">getColGroupType</a></span>()</code>
<div class="block">Internally get the specific type of ColGroup, this could be extracted from the object but that does not allow for
nice switches in the code.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#getColIndex-int-">getColIndex</a></span>(int&nbsp;colNum)</code>
<div class="block">Obtain a column index value.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>int[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#getColIndices--">getColIndices</a></span>()</code>
<div class="block">Obtain the offsets of the columns in the matrix block that make up the group</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>abstract <a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.CompressionType.html" title="enum in org.apache.sysds.runtime.compress.colgroup">ColGroup.CompressionType</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#getCompType--">getCompType</a></span>()</code>
<div class="block">Obtain the compression type.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>abstract long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#getExactSizeOnDisk--">getExactSizeOnDisk</a></span>()</code>
<div class="block">Returns the exact serialized size of column group.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>abstract <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../../../../org/apache/sysds/runtime/matrix/data/IJV.html" title="class in org.apache.sysds.runtime.matrix.data">IJV</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#getIterator-int-int-boolean-boolean-">getIterator</a></span>(int&nbsp;rl,
int&nbsp;ru,
boolean&nbsp;inclZeros,
boolean&nbsp;rowMajor)</code>
<div class="block">Create a column group iterator for a row index range.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#getNumCols--">getNumCols</a></span>()</code>
<div class="block">Obtain the number of columns in this column group.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#getNumRows--">getNumRows</a></span>()</code>
<div class="block">Get number of rows contained in the ColGroup.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>abstract <a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.ColGroupRowIterator.html" title="class in org.apache.sysds.runtime.compress.colgroup">ColGroup.ColGroupRowIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#getRowIterator-int-int-">getRowIterator</a></span>(int&nbsp;rl,
int&nbsp;ru)</code>
<div class="block">Create a dense row iterator for a row index range.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#leftMultByRowVector-org.apache.sysds.runtime.matrix.data.MatrixBlock-org.apache.sysds.runtime.matrix.data.MatrixBlock-">leftMultByRowVector</a></span>(<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;vector,
<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;result)</code>
<div class="block">Multiply the slice of the matrix that this column group represents by a row vector on the left (the original
column vector is assumed to be transposed already i.e.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#readFields-java.io.DataInput-">readFields</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)</code>
<div class="block">Deserializes column group from data input.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#readFields-java.io.DataInput-boolean-">readFields</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in,
boolean&nbsp;skipDict)</code>
<div class="block">Deserializes column group from data input.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#rightMultByVector-org.apache.sysds.runtime.matrix.data.MatrixBlock-org.apache.sysds.runtime.matrix.data.MatrixBlock-int-int-">rightMultByVector</a></span>(<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;vector,
<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;result,
int&nbsp;rl,
int&nbsp;ru)</code>
<div class="block">Multiply the slice of the matrix that this column group represents by a vector on the right.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>abstract <a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html" title="class in org.apache.sysds.runtime.compress.colgroup">ColGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#scalarOperation-org.apache.sysds.runtime.matrix.operators.ScalarOperator-">scalarOperation</a></span>(<a href="../../../../../../org/apache/sysds/runtime/matrix/operators/ScalarOperator.html" title="class in org.apache.sysds.runtime.matrix.operators">ScalarOperator</a>&nbsp;op)</code>
<div class="block">Perform the specified scalar operation directly on the compressed column group, without decompressing individual
cells if possible.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#shiftColIndices-int-">shiftColIndices</a></span>(int&nbsp;offset)</code>&nbsp;</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#unaryAggregateOperations-org.apache.sysds.runtime.matrix.operators.AggregateUnaryOperator-org.apache.sysds.runtime.matrix.data.MatrixBlock-">unaryAggregateOperations</a></span>(<a href="../../../../../../org/apache/sysds/runtime/matrix/operators/AggregateUnaryOperator.html" title="class in org.apache.sysds.runtime.matrix.operators">AggregateUnaryOperator</a>&nbsp;op,
<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;result)</code>
<div class="block">Unary Aggregate operator, since aggregate operators require new object output, the output becomes an uncompressed
matrix.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#write-java.io.DataOutput-">write</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out)</code>
<div class="block">Serializes column group to data output.</div>
</td>
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<tr id="i23" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html#write-java.io.DataOutput-boolean-">write</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out,
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<div class="block">Serializes column group to data output.</div>
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<pre>protected static final&nbsp;org.apache.commons.logging.Log LOG</pre>
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<pre>protected&nbsp;int[] _colIndexes</pre>
<div class="block">The ColGroup Indexes 0 offset, contained in the ColGroup</div>
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<pre>protected&nbsp;boolean _zeros</pre>
<div class="block">ColGroup Implementation Contains zero values</div>
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<pre>protected&nbsp;int _numRows</pre>
<div class="block">Number of rows in the matrix, for use by child classes.</div>
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<pre>protected&nbsp;ColGroup()</pre>
<div class="block">Empty constructor, used for serializing into an empty new object of ColGroup.</div>
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<pre>protected&nbsp;ColGroup(int[]&nbsp;colIndices,
int&nbsp;numRows)</pre>
<div class="block">Main constructor.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>colIndices</code> - offsets of the columns in the matrix block that make up the group</dd>
<dd><code>numRows</code> - total number of rows in the block</dd>
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<pre>public&nbsp;int[]&nbsp;getColIndices()</pre>
<div class="block">Obtain the offsets of the columns in the matrix block that make up the group</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>offsets of the columns in the matrix block that make up the group</dd>
</dl>
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<pre>public&nbsp;int&nbsp;getColIndex(int&nbsp;colNum)</pre>
<div class="block">Obtain a column index value.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>colNum</code> - column number</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>column index value</dd>
</dl>
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<pre>public&nbsp;int&nbsp;getNumRows()</pre>
<div class="block">Get number of rows contained in the ColGroup.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An integer that is the number of rows.</dd>
</dl>
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<pre>public&nbsp;int&nbsp;getNumCols()</pre>
<div class="block">Obtain the number of columns in this column group.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>number of columns in this column group</dd>
</dl>
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<pre>public abstract&nbsp;<a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.CompressionType.html" title="enum in org.apache.sysds.runtime.compress.colgroup">ColGroup.CompressionType</a>&nbsp;getCompType()</pre>
<div class="block">Obtain the compression type.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>How the elements of the column group are compressed.</dd>
</dl>
</li>
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<pre>protected abstract&nbsp;<a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.ColGroupType.html" title="enum in org.apache.sysds.runtime.compress.colgroup">ColGroup.ColGroupType</a>&nbsp;getColGroupType()</pre>
<div class="block">Internally get the specific type of ColGroup, this could be extracted from the object but that does not allow for
nice switches in the code.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>ColGroupType of the object.</dd>
</dl>
</li>
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<pre>public&nbsp;void&nbsp;shiftColIndices(int&nbsp;offset)</pre>
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<pre>public&nbsp;long&nbsp;estimateInMemorySize()</pre>
<div class="block">Note: Must be overridden by child classes to account for additional data and metadata</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an upper bound on the number of bytes used to store this ColGroup in memory.</dd>
</dl>
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<pre>public abstract&nbsp;void&nbsp;decompressToBlock(<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;target,
int&nbsp;rl,
int&nbsp;ru)</pre>
<div class="block">Decompress the contents of this column group into the specified full matrix block.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>target</code> - a matrix block where the columns covered by this column group have not yet been filled in.</dd>
<dd><code>rl</code> - row lower</dd>
<dd><code>ru</code> - row upper</dd>
</dl>
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<pre>public abstract&nbsp;void&nbsp;decompressToBlock(<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;target,
int[]&nbsp;colIndexTargets)</pre>
<div class="block">Decompress the contents of this column group into uncompressed packed columns</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>target</code> - a dense matrix block. The block must have enough space to hold the contents of this column
group.</dd>
<dd><code>colIndexTargets</code> - array that maps column indices in the original matrix block to columns of target.</dd>
</dl>
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<pre>public abstract&nbsp;void&nbsp;decompressToBlock(<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;target,
int&nbsp;colpos)</pre>
<div class="block">Decompress to block.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>target</code> - dense output vector</dd>
<dd><code>colpos</code> - column to decompress, error if larger or equal numCols</dd>
</dl>
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<pre>public abstract&nbsp;void&nbsp;write(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Serializes column group to data output.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>out</code> - data output</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if IOException occurs</dd>
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<pre>public&nbsp;void&nbsp;write(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out,
boolean&nbsp;skipDict)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Serializes column group to data output.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>out</code> - data output</dd>
<dd><code>skipDict</code> - skip shared dictionary</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if IOException occurs</dd>
</dl>
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<pre>public abstract&nbsp;void&nbsp;readFields(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Deserializes column group from data input.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>in</code> - data input</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if IOException occurs</dd>
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<pre>public&nbsp;void&nbsp;readFields(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in,
boolean&nbsp;skipDict)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Deserializes column group from data input.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>in</code> - data input</dd>
<dd><code>skipDict</code> - skip shared dictionary</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if IOException occurs</dd>
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<pre>public abstract&nbsp;long&nbsp;getExactSizeOnDisk()</pre>
<div class="block">Returns the exact serialized size of column group. This can be used for example for buffer preallocation.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>exact serialized size for column group</dd>
</dl>
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<pre>public abstract&nbsp;double&nbsp;get(int&nbsp;r,
int&nbsp;c)</pre>
<div class="block">Get the value at a global row/column position.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>r</code> - row</dd>
<dd><code>c</code> - column</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>value at the row/column position</dd>
</dl>
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<pre>public abstract&nbsp;void&nbsp;rightMultByVector(<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;vector,
<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;result,
int&nbsp;rl,
int&nbsp;ru)</pre>
<div class="block">Multiply the slice of the matrix that this column group represents by a vector on the right.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>vector</code> - vector to multiply by (tall vector)</dd>
<dd><code>result</code> - accumulator for holding the result</dd>
<dd><code>rl</code> - row lower</dd>
<dd><code>ru</code> - row upper if the internal SystemML code that performs the multiplication experiences an error</dd>
</dl>
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<pre>public abstract&nbsp;void&nbsp;leftMultByRowVector(<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;vector,
<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;result)</pre>
<div class="block">Multiply the slice of the matrix that this column group represents by a row vector on the left (the original
column vector is assumed to be transposed already i.e. its size now is 1xn).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>vector</code> - row vector</dd>
<dd><code>result</code> - matrix block result</dd>
</dl>
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<pre>public abstract&nbsp;<a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.html" title="class in org.apache.sysds.runtime.compress.colgroup">ColGroup</a>&nbsp;scalarOperation(<a href="../../../../../../org/apache/sysds/runtime/matrix/operators/ScalarOperator.html" title="class in org.apache.sysds.runtime.matrix.operators">ScalarOperator</a>&nbsp;op)</pre>
<div class="block">Perform the specified scalar operation directly on the compressed column group, without decompressing individual
cells if possible.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>op</code> - operation to perform</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>version of this column group with the operation applied</dd>
</dl>
</li>
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<pre>public abstract&nbsp;void&nbsp;unaryAggregateOperations(<a href="../../../../../../org/apache/sysds/runtime/matrix/operators/AggregateUnaryOperator.html" title="class in org.apache.sysds.runtime.matrix.operators">AggregateUnaryOperator</a>&nbsp;op,
<a href="../../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;result)</pre>
<div class="block">Unary Aggregate operator, since aggregate operators require new object output, the output becomes an uncompressed
matrix.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>op</code> - The operator used</dd>
<dd><code>result</code> - the output matrix block.</dd>
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<pre>public abstract&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../../../../org/apache/sysds/runtime/matrix/data/IJV.html" title="class in org.apache.sysds.runtime.matrix.data">IJV</a>&gt;&nbsp;getIterator(int&nbsp;rl,
int&nbsp;ru,
boolean&nbsp;inclZeros,
boolean&nbsp;rowMajor)</pre>
<div class="block">Create a column group iterator for a row index range.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rl</code> - row lower index, inclusive</dd>
<dd><code>ru</code> - row upper index, exclusive</dd>
<dd><code>inclZeros</code> - include zero values into scope of iterator</dd>
<dd><code>rowMajor</code> - use a row major iteration order</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an iterator instance</dd>
</dl>
</li>
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<pre>public abstract&nbsp;<a href="../../../../../../org/apache/sysds/runtime/compress/colgroup/ColGroup.ColGroupRowIterator.html" title="class in org.apache.sysds.runtime.compress.colgroup">ColGroup.ColGroupRowIterator</a>&nbsp;getRowIterator(int&nbsp;rl,
int&nbsp;ru)</pre>
<div class="block">Create a dense row iterator for a row index range. This iterator implies the inclusion of zeros and row-major
iteration order.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rl</code> - row lower index, inclusive</dd>
<dd><code>ru</code> - row upper index, exclusive</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an iterator instance</dd>
</dl>
</li>
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<pre>public abstract&nbsp;void&nbsp;countNonZerosPerRow(int[]&nbsp;rnnz,
int&nbsp;rl,
int&nbsp;ru)</pre>
<div class="block">Count the number of non-zeros per row</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rnnz</code> - non-zeros per row</dd>
<dd><code>rl</code> - row lower bound, inclusive</dd>
<dd><code>ru</code> - row upper bound, exclusive</dd>
</dl>
</li>
</ul>
</li>
</ul>
</li>
</ul>
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