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Glossary of Genetic Programming Terms</td>
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<h1 class="dtH1" style="font-size: 85%; position: relative; left: 5px;">Problem Space Term </h1>
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<p> The space of all problems, particularly those with computational solutions.</p>
<H4 class="dtH4">Remarks</H4>
<P>For <a href="Glossary.GeneticProgramming.html">Genetic Programming</a>, the <strong>Problem Space</strong> is divided into <a href="Glossary.Objects.Individual.html">Individual</a>, <a href="Glossary.Objects.Environment.html">Environment</a>, and <a href="Glossary.Objects.History.html">History</a> implementations. This is similar to the logical organization used by other <a href="Glossary.EvolutionaryAlgorithms.html">Evolutionary Algorithms</a> techniques. </P>
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<h4 style="position: relative; top: -5px;">Design Note</h4>
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<p>In this framework, all problems must implement, at minimum, the <a href="GeneticProgrammingEngine.ProblemSpace.IIndividual.html">IIndividual</a>, <a href="GeneticProgrammingEngine.ProblemSpace.IEnvironment.html">IEnvironment</a>, and <a href="GeneticProgrammingEngine.ProblemSpace.IHistory.html">IHistory</a> interfaces defined in the <a href="GeneticProgrammingEngine.ProblemSpace.html">ProblemSpace</a> namespace. However, since implementations of classes like <strong>IEnvironment</strong> tend to be less problem-specific, they are often shared between problems.</p>
<p>For example, in the case of the <em>Artificial Ant</em> problem, the same environment may be used to represent both the path-finding and obstacle-avoidance versions of the problem. As long as the <strong>IEnvironment</strong> can keep track of both obstacles and food, and appropriate initialization files are used, the path-finding version can simply restrict itself to the subset of the <strong>IEnvironment</strong> implementation that uses only food.</p>
<p>Some problems may also require a new implementation of <a href="GeneticProgrammingEngine.ProblemSpace.Precode.IPrecodeTree.html">IPrecodeTree</a>. Since <strong>IPrecodeTree</strong> can represent a tree of appropriately formatted methods from <em>any</em> class, the default implementations will be adequate for most problems. However, if new method signatures are used in the <strong>IIndividual</strong> <em>Base Class</em>, a new <strong>IPrecodeTree</strong> implementation will be required. </p>
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<h4 class="dtH4">See Also</h4>
<P> <a href="GeneticProgrammingEngine.ProblemSpace.html">GeneticProgrammingEngine.ProblemSpace Namespace</a> | <a href="GeneticProgrammingEngine.ProblemSpace.IIndividual.html">IIndividual Interface</a> | <a href="GeneticProgrammingEngine.ProblemSpace.IEnvironment.html">IEnvironment Interface</a> | <a href="GeneticProgrammingEngine.ProblemSpace.IHistory.html">IHistory Interface</a> | <a href="GeneticProgrammingEngine.ProblemSpace.Precode.IPrecodeTree.html">IPrecodeTree Interface</a> </P>
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