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| <h2 title="Class MunkresAssignment" class="title">Class MunkresAssignment</h2> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/util/MunkresAssignment.html#line.38">MunkresAssignment</a> |
| 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></pre> |
| <div class="block">Computes the optimal (minimal cost) assignment of jobs to workers (or other |
| analogous) concepts given a cost matrix of each pair of job and worker, using |
| the algorithm by James Munkres in "Algorithms for the Assignment and |
| Transportation Problems", with additional optimizations as described by Jin |
| Kue Wong in "A New Implementation of an Algorithm for the Optimal Assignment |
| Problem: An Improved Version of Munkres' Algorithm". The algorithm runs in |
| O(n^3) time and need O(n^2) auxiliary space where n is the number of jobs or |
| workers, whichever is greater.</div> |
| </li> |
| </ul> |
| </div> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private int[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#assignments">assignments</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private float[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#colAdjust">colAdjust</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#cols">cols</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private boolean[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#colsCovered">colsCovered</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private float[][]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#cost">cost</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private float[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#leastInRow">leastInRow</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private int[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#leastInRowIndex">leastInRowIndex</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private byte[][]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#mask">mask</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static byte</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#NONE">NONE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Deque.html?is-external=true" title="class or interface in java.util">Deque</a><<a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#path">path</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static byte</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#PRIME">PRIME</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private float[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#rowAdjust">rowAdjust</a></span></code> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#rows">rows</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private boolean[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#rowsCovered">rowsCovered</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static byte</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#STAR">STAR</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#transposed">transposed</a></span></code> </td> |
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| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <ul class="blockList"> |
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| <h3>Constructor Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> |
| <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><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#MunkresAssignment-float:A:A-">MunkresAssignment</a></span>(float[][] costMatrix)</code> |
| <div class="block">Construct a new problem instance with the specified cost matrix.</div> |
| </td> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#findUncoveredZero--">findUncoveredZero</a></span>()</code> |
| <div class="block">Find a zero cost assignment which is not covered.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#preliminaries--">preliminaries</a></span>()</code> |
| <div class="block">Corresponds to the "preliminaries" step of the original algorithm.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#primeInRow-int-">primeInRow</a></span>(int r)</code> |
| <div class="block">Find a primed zero in the specified row.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>int[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#solve--">solve</a></span>()</code> |
| <div class="block">Get the optimal assignments.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#starInCol-int-">starInCol</a></span>(int c)</code> |
| <div class="block">Find a starred zero in the specified column.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#starInRow-int-">starInRow</a></span>(int r)</code> |
| <div class="block">Find a starred zero in a specified row.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#stepOne--">stepOne</a></span>()</code> |
| <div class="block">Corresponds to step 1 of the original algorithm.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#stepThree--">stepThree</a></span>()</code> |
| <div class="block">Corresponds to step 3 of the original algorithm.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#stepTwo--">stepTwo</a></span>()</code> |
| <div class="block">Corresponds to step 2 of the original algorithm.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#testIsDone--">testIsDone</a></span>()</code> |
| <div class="block">Test whether the algorithm is done, i.e.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/MunkresAssignment.html#updateMin-int-int-">updateMin</a></span>(int row, |
| int col)</code> |
| <div class="block">A specified row has become covered, and a specified column has become |
| uncovered.</div> |
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| </tr> |
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| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/util/MunkresAssignment.html#line.97">MunkresAssignment</a>(float[][] costMatrix)</pre> |
| <div class="block">Construct a new problem instance with the specified cost matrix. The cost |
| matrix must be rectangular, though not necessarily square. If one dimension |
| is greater than the other, some elements in the greater dimension will not |
| be assigned. The input cost matrix will not be modified.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>costMatrix</code> - </dd> |
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| <pre>public int[] <a href="../../../../../src-html/org/apache/hadoop/hbase/util/MunkresAssignment.html#line.157">solve</a>()</pre> |
| <div class="block">Get the optimal assignments. The returned array will have the same number |
| of elements as the number of elements as the number of rows in the input |
| cost matrix. Each element will indicate which column should be assigned to |
| that row or -1 if no column should be assigned, i.e. if result[i] = j then |
| row i should be assigned to column j. Subsequent invocations of this method |
| will simply return the same object without additional computation.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array with the optimal assignments</dd> |
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| <div class="block">Corresponds to the "preliminaries" step of the original algorithm. |
| Guarantees that the matrix is an equivalent non-negative matrix with at |
| least one zero in each row.</div> |
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| <div class="block">Test whether the algorithm is done, i.e. we have the optimal assignment. |
| This occurs when there is exactly one starred zero in each row.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the algorithm is done</dd> |
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| <pre>private boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/util/MunkresAssignment.html#line.309">stepOne</a>()</pre> |
| <div class="block">Corresponds to step 1 of the original algorithm.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>false if all zeroes are covered</dd> |
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| <div class="block">Corresponds to step 2 of the original algorithm.</div> |
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| <div class="block">Corresponds to step 3 of the original algorithm.</div> |
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| <pre>private <a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> <a href="../../../../../src-html/org/apache/hadoop/hbase/util/MunkresAssignment.html#line.438">findUncoveredZero</a>()</pre> |
| <div class="block">Find a zero cost assignment which is not covered. If there are no zero cost |
| assignments which are uncovered, then null will be returned.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>pair of row and column indices of an uncovered zero or null</dd> |
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| <pre>private void <a href="../../../../../src-html/org/apache/hadoop/hbase/util/MunkresAssignment.html#line.453">updateMin</a>(int row, |
| int col)</pre> |
| <div class="block">A specified row has become covered, and a specified column has become |
| uncovered. The least value per row may need to be updated.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>row</code> - the index of the row which was just covered</dd> |
| <dd><code>col</code> - the index of the column which was just uncovered</dd> |
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| <div class="block">Find a starred zero in a specified row. If there are no starred zeroes in |
| the specified row, then null will be returned.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>r</code> - the index of the row to be searched</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>pair of row and column indices of starred zero or null</dd> |
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| <div class="block">Find a starred zero in the specified column. If there are no starred zeroes |
| in the specified row, then null will be returned.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>c</code> - the index of the column to be searched</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>pair of row and column indices of starred zero or null</dd> |
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| <div class="block">Find a primed zero in the specified row. If there are no primed zeroes in |
| the specified row, then null will be returned.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>r</code> - the index of the row to be searched</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>pair of row and column indices of primed zero or null</dd> |
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