Ejemplo n.º 1
0
/*!
 *  \brief Randomly select a node that takes arguments from a specific
 *    tree in the individual.
 *  \return Randomly selected tree
 */
unsigned int GP::Individual::chooseRandomNodeWithArgs(unsigned int inTree,
        GP::Context& ioContext) const
{
	Beagle_StackTraceBeginM();
	const GP::Tree& lTree = *(operator[](inTree));
	unsigned int lSize = lTree.size();
	if (lSize < 2) {
		std::ostringstream lOSS;
		lOSS << "In GP::Individual::chooseRandomNodeWithArgs(): ";
		lOSS << "Could not choose a node with arguments because the specified tree has fewer ";
		lOSS << "than two (" << lSize << ") nodes, hence there are no such nodes";
		lOSS << " in the tree. This occurred while calling chooseRandomNodeWithArgs() with an ";
		lOSS << "inTree value of " << inTree;
		throw Beagle_RunTimeExceptionM(lOSS.str());
	}

	// Loop through the tree adding appropriate nodes into the roulette
	RouletteT<unsigned int> lRoulette;
	for (unsigned int i=0; i<lSize; i++) {
		if(lTree[i].mSubTreeSize > 1) lRoulette.insert(i);
	}

	// Select node with roulette
	Beagle_AssertM(!lRoulette.empty());
	return lRoulette.select(ioContext.getSystem().getRandomizer());
	Beagle_StackTraceEndM();
}
Ejemplo n.º 2
0
/*!
 *  \brief Randomly select a node that takes no argument from a specific
 *    tree in the individual.
 *  \return Randomly selected tree
 */
unsigned int GP::Individual::chooseRandomNodeWithoutArgs(unsigned int inTree,
        GP::Context& ioContext) const
{
	Beagle_StackTraceBeginM();
	// Loop through the tree adding appropriate nodes into the roulette
	unsigned int lSize = operator[](inTree)->size();
	RouletteT<unsigned int> lRoulette;
	for (unsigned int i=0; i<lSize; i++) {
		if (operator[](inTree)->operator[](i).mSubTreeSize == 1) {
			lRoulette.insert(i);
		}
	}
	// Select node with roulette
	Beagle_AssertM(!lRoulette.empty());
	return lRoulette.select(ioContext.getSystem().getRandomizer());
	Beagle_StackTraceEndM();
}