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-<div class="subTitle">jcgp.backend.modules.problem</div>
-<h2 title="Class Problem" class="title">Class Problem</h2>
-</div>
-<div class="contentContainer">
-<ul class="inheritance">
-<li>java.lang.Object</li>
-<li>
-<ul class="inheritance">
-<li><a href="../../../../jcgp/backend/modules/Module.html" title="class in jcgp.backend.modules">jcgp.backend.modules.Module</a></li>
-<li>
-<ul class="inheritance">
-<li>jcgp.backend.modules.problem.Problem</li>
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-</li>
-</ul>
-</li>
-</ul>
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-<dd><a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.html" title="class in jcgp.backend.modules.problem">TestCaseProblem</a></dd>
-</dl>
-<hr>
-<br>
-<pre>public abstract class <span class="typeNameLabel">Problem</span>
-extends <a href="../../../../jcgp/backend/modules/Module.html" title="class in jcgp.backend.modules">Module</a></pre>
-<div class="block">Defines the general behaviour of a CGP problem. The primary function of <code>Problem</code>
- is to evaluate a population and assign a fitness value to each chromosome.
- <br>
- Problems are free to define whether better fitness means a higher or lower fitness value.
- In some problem types, it is more convenient to treat fitness 0 as the best possible value.
- This can be done by changing the fitness orientation to <code>BestFitness.HIGH</code> or <code>BestFitness.LOW</code> as appropriate.
- Fitness orientation is set to high by default.
- <br><br>
- When extending this class, the constructor should call a few methods in order to
- properly construct the problem type: <code>setFunctionSet()</code>, <code>setFileExtension()</code> and <code>setFitnessOrientation()</code>,
- with the respective arguments. As with all subclasses of <code>Module</code>, <code>setName()</code> and
- <code>registerParameters()</code> should be used where appropriate as well.
- <br><br>
- It is advisable to use <code>Resources.reportln()</code> and <code>Resources.report()</code>
- to print any relevant information. Note that reportln() and report() are affected
- by the report interval base parameter. Use <code>Resources.println()</code> and
- <code>Resources.print()</code> to print information regardless of the current generation.
- See <a href="../../../../jcgp/backend/resources/Resources.html" title="class in jcgp.backend.resources"><code>Resources</code></a> for more information.</div>
-<dl>
-<dt><span class="simpleTagLabel">Author:</span></dt>
-<dd>Eduardo Pedroni</dd>
-<dt><span class="seeLabel">See Also:</span></dt>
-<dd><a href="../../../../jcgp/backend/modules/Module.html" title="class in jcgp.backend.modules"><code>Module</code></a></dd>
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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>
-</tr>
-<tr id="i0" class="altColor">
-<td class="colFirst"><code>abstract void</code></td>
-<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/Problem.html#evaluate-jcgp.backend.population.Population-">evaluate</a></span>(<a href="../../../../jcgp/backend/population/Population.html" title="class in jcgp.backend.population">Population</a>&nbsp;population)</code>
-<div class="block">The most important method of the problem type.</div>
-</td>
-</tr>
-<tr id="i1" class="rowColor">
-<td class="colFirst"><code>double</code></td>
-<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/Problem.html#getBestFitness--">getBestFitness</a></span>()</code>&nbsp;</td>
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-<tr id="i2" class="altColor">
-<td class="colFirst"><code>java.lang.String</code></td>
-<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/Problem.html#getFileExtension--">getFileExtension</a></span>()</code>&nbsp;</td>
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-<td class="colFirst"><code><a href="../../../../jcgp/backend/modules/problem/BestFitness.html" title="enum in jcgp.backend.modules.problem">BestFitness</a></code></td>
-<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/Problem.html#getFitnessOrientation--">getFitnessOrientation</a></span>()</code>&nbsp;</td>
-</tr>
-<tr id="i4" class="altColor">
-<td class="colFirst"><code><a href="../../../../jcgp/backend/function/FunctionSet.html" title="class in jcgp.backend.function">FunctionSet</a></code></td>
-<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/Problem.html#getFunctionSet--">getFunctionSet</a></span>()</code>&nbsp;</td>
-</tr>
-<tr id="i5" class="rowColor">
-<td class="colFirst"><code>abstract int</code></td>
-<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/Problem.html#hasImprovement-jcgp.backend.population.Population-">hasImprovement</a></span>(<a href="../../../../jcgp/backend/population/Population.html" title="class in jcgp.backend.population">Population</a>&nbsp;population)</code>
-<div class="block">Used to assert whether a given population has a chromosome that is an improvement over
- the current best chromosome.</div>
-</td>
-</tr>
-<tr id="i6" class="altColor">
-<td class="colFirst"><code>abstract int</code></td>
-<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/Problem.html#hasPerfectSolution-jcgp.backend.population.Population-">hasPerfectSolution</a></span>(<a href="../../../../jcgp/backend/population/Population.html" title="class in jcgp.backend.population">Population</a>&nbsp;population)</code>
-<div class="block">Used to assert whether a given population contains a perfect solution
- to the problem.</div>
-</td>
-</tr>
-<tr id="i7" class="rowColor">
-<td class="colFirst"><code>abstract void</code></td>
-<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/Problem.html#parseProblemData-java.io.File-jcgp.backend.resources.ModifiableResources-">parseProblemData</a></span>(java.io.File&nbsp;file,
- <a href="../../../../jcgp/backend/resources/ModifiableResources.html" title="class in jcgp.backend.resources">ModifiableResources</a>&nbsp;resources)</code>
-<div class="block">Parses the specified file and uses the parsed data to
- set up the problem type instance appropriately.</div>
-</td>
-</tr>
-<tr id="i8" class="altColor">
-<td class="colFirst"><code>void</code></td>
-<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/Problem.html#reset--">reset</a></span>()</code>
-<div class="block">Resets the bestFitness parameter.</div>
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-<div class="block">The most important method of the problem type. This is called once
- per generation, when the new population has been generated.
- <br><br>
- The basic functionality of this method is to loop through all chromosomes
- in the population and decode them according to the problem type. The
- fitness of each chromosome is then calculated using the problem data
- or otherwise (subjective problem types such as art generation might
- leave fitness evaluations up to the user) and assigned to the appropriate
- chromosome.
- <br><br>
- In addition, realisations of this method should update the value of
- bestFitness as appropriate, since the value of this parameter is displayed
- if a GUI is in use.</div>
-<dl>
-<dt><span class="paramLabel">Parameters:</span></dt>
-<dd><code>population</code> - the population to be evaluated.</dd>
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-<div class="block">Used to assert whether a given population contains a perfect solution
- to the problem. It is up to the problem to define what qualifies
- a perfect solution, as some problems (subject ones such as music and
- art evolution, for example) might not have perfect solutions at all.</div>
-<dl>
-<dt><span class="paramLabel">Parameters:</span></dt>
-<dd><code>population</code> - the population to search through for a perfect chromosome.</dd>
-<dt><span class="returnLabel">Returns:</span></dt>
-<dd>the perfect solution index, if one exits, -1 if no perfect solution was found.</dd>
-</dl>
-</li>
-</ul>
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-<pre>public abstract&nbsp;int&nbsp;hasImprovement(<a href="../../../../jcgp/backend/population/Population.html" title="class in jcgp.backend.population">Population</a>&nbsp;population)</pre>
-<div class="block">Used to assert whether a given population has a chromosome that is an improvement over
- the current best chromosome. A typical implementation of this method
- will simply compare chromosome fitness values, though the problem type
- is free to implement this in any way.</div>
-<dl>
-<dt><span class="paramLabel">Parameters:</span></dt>
-<dd><code>population</code> - the population potentially containing a fitter chromosome.</dd>
-<dt><span class="returnLabel">Returns:</span></dt>
-<dd>the index of the first chromosome in the population that is an improvement, -1 if none is found.</dd>
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-<pre>public abstract&nbsp;void&nbsp;parseProblemData(java.io.File&nbsp;file,
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-<div class="block">Parses the specified file and uses the parsed data to
- set up the problem type instance appropriately. Any necessary
- resource changes can be performed using the provided <code>ModifiableResources</code>
- instance.
- <br><br>
- In addition, realisations of this method should update the value of
- maxFitness where appropriate, as this may be displayed to the user
- if a GUI is in use.</div>
-<dl>
-<dt><span class="paramLabel">Parameters:</span></dt>
-<dd><code>file</code> - the data file to parse.</dd>
-<dd><code>resources</code> - a modifiable reference to the experiment's resources.</dd>
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-<dl>
-<dt><span class="returnLabel">Returns:</span></dt>
-<dd>the FunctionSet object used by this problem type.</dd>
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-</li>
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-<a name="getFileExtension--">
-<!-- -->
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-<h4>getFileExtension</h4>
-<pre>public&nbsp;java.lang.String&nbsp;getFileExtension()</pre>
-<dl>
-<dt><span class="returnLabel">Returns:</span></dt>
-<dd>the file extension accepted by this problem type for problem data files.</dd>
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-<dl>
-<dt><span class="returnLabel">Returns:</span></dt>
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-<pre>public&nbsp;double&nbsp;getBestFitness()</pre>
-<dl>
-<dt><span class="returnLabel">Returns:</span></dt>
-<dd>the current best fitness, in other words, the fitness
- value of the fittest chromosome in the current generation.</dd>
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-<pre>public&nbsp;void&nbsp;reset()</pre>
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-</ul>
-</li>
-</ul>
-</div>
-</div>
-<!-- ========= END OF CLASS DATA ========= -->
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