private void Initialize(IEnumerable <string> variableNames, int nConstants)
{
#region symbol declaration
var add = new Addition();
var sub = new Subtraction();
var mul = new Multiplication();
var div = new Division();
var mean = new Average();
var log = new Logarithm();
var pow = new Power();
var square = new Square();
var root = new Root();
var sqrt = new SquareRoot();
var exp = new Exponential();
// we use our own random number generator here because we assume
// that grammars are only initialized once when setting the grammar in the problem.
// This means everytime the grammar parameter in the problem is changed
// we initialize the constants to new values
var rand = new MersenneTwister();
// warm up
for (int i = 0; i < 1000; i++)
{
rand.NextDouble();
}
var constants = new List <Constant>(nConstants);
for (int i = 0; i < nConstants; i++)
{
var constant = new Constant();
do
{
var constVal = rand.NextDouble() * 20.0 - 10.0;
constant.Name = string.Format("{0:0.000}", constVal);
constant.MinValue = constVal;
constant.MaxValue = constVal;
constant.ManipulatorSigma = 0.0;
constant.ManipulatorMu = 0.0;
constant.MultiplicativeManipulatorSigma = 0.0;
} while (constants.Any(c => c.Name == constant.Name)); // unlikely, but it could happen that the same constant value is sampled twice. so we resample if necessary.
constants.Add(constant);
}
var variables = new List <HeuristicLab.Problems.DataAnalysis.Symbolic.Variable>();
foreach (var variableName in variableNames)
{
var variableSymbol = new HeuristicLab.Problems.DataAnalysis.Symbolic.Variable();
variableSymbol.Name = variableName;
variableSymbol.WeightManipulatorMu = 0.0;
variableSymbol.WeightManipulatorSigma = 0.0;
variableSymbol.WeightMu = 1.0;
variableSymbol.WeightSigma = 0.0;
variableSymbol.MultiplicativeWeightManipulatorSigma = 0.0;
variableSymbol.AllVariableNames = new[] { variableName };
variableSymbol.VariableNames = new[] { variableName };
variables.Add(variableSymbol);
}
#endregion
AddSymbol(add);
AddSymbol(sub);
AddSymbol(mul);
AddSymbol(div);
AddSymbol(mean);
AddSymbol(log);
AddSymbol(pow);
AddSymbol(square);
AddSymbol(root);
AddSymbol(sqrt);
AddSymbol(exp);
constants.ForEach(AddSymbol);
variables.ForEach(AddSymbol);
#region subtree count configuration
SetSubtreeCount(add, 2, 2);
SetSubtreeCount(sub, 2, 2);
SetSubtreeCount(mul, 2, 2);
SetSubtreeCount(div, 2, 2);
SetSubtreeCount(mean, 2, 2);
SetSubtreeCount(log, 1, 1);
SetSubtreeCount(pow, 2, 2);
SetSubtreeCount(square, 1, 1);
SetSubtreeCount(root, 2, 2);
SetSubtreeCount(sqrt, 1, 1);
SetSubtreeCount(exp, 1, 1);
constants.ForEach((c) => SetSubtreeCount(c, 0, 0));
variables.ForEach((v) => SetSubtreeCount(v, 0, 0));
#endregion
var functions = new ISymbol[] { add, sub, mul, div, mean, log, pow, root, square, sqrt };
var terminalSymbols = variables.Concat <ISymbol>(constants);
var allSymbols = functions.Concat(terminalSymbols);
#region allowed child symbols configuration
foreach (var s in allSymbols)
{
AddAllowedChildSymbol(StartSymbol, s);
}
foreach (var parentSymb in functions)
{
foreach (var childSymb in allSymbols)
{
AddAllowedChildSymbol(parentSymb, childSymb);
}
}
#endregion
}
private void Initialize(IEnumerable<string> variableNames, int nConstants) {
#region symbol declaration
var add = new Addition();
var sub = new Subtraction();
var mul = new Multiplication();
var div = new Division();
var mean = new Average();
var log = new Logarithm();
var pow = new Power();
var square = new Square();
var root = new Root();
var sqrt = new SquareRoot();
var exp = new Exponential();
// we use our own random number generator here because we assume
// that grammars are only initialized once when setting the grammar in the problem.
// This means everytime the grammar parameter in the problem is changed
// we initialize the constants to new values
var rand = new MersenneTwister();
// warm up
for (int i = 0; i < 1000; i++) rand.NextDouble();
var constants = new List<Constant>(nConstants);
for (int i = 0; i < nConstants; i++) {
var constant = new Constant();
do {
var constVal = rand.NextDouble() * 20.0 - 10.0;
constant.Name = string.Format("{0:0.000}", constVal);
constant.MinValue = constVal;
constant.MaxValue = constVal;
constant.ManipulatorSigma = 0.0;
constant.ManipulatorMu = 0.0;
constant.MultiplicativeManipulatorSigma = 0.0;
} while (constants.Any(c => c.Name == constant.Name)); // unlikely, but it could happen that the same constant value is sampled twice. so we resample if necessary.
constants.Add(constant);
}
var variables = new List<HeuristicLab.Problems.DataAnalysis.Symbolic.Variable>();
foreach (var variableName in variableNames) {
var variableSymbol = new HeuristicLab.Problems.DataAnalysis.Symbolic.Variable();
variableSymbol.Name = variableName;
variableSymbol.WeightManipulatorMu = 0.0;
variableSymbol.WeightManipulatorSigma = 0.0;
variableSymbol.WeightMu = 1.0;
variableSymbol.WeightSigma = 0.0;
variableSymbol.MultiplicativeWeightManipulatorSigma = 0.0;
variableSymbol.AllVariableNames = new[] { variableName };
variableSymbol.VariableNames = new[] { variableName };
variables.Add(variableSymbol);
}
#endregion
AddSymbol(add);
AddSymbol(sub);
AddSymbol(mul);
AddSymbol(div);
AddSymbol(mean);
AddSymbol(log);
AddSymbol(pow);
AddSymbol(square);
AddSymbol(root);
AddSymbol(sqrt);
AddSymbol(exp);
constants.ForEach(AddSymbol);
variables.ForEach(AddSymbol);
#region subtree count configuration
SetSubtreeCount(add, 2, 2);
SetSubtreeCount(sub, 2, 2);
SetSubtreeCount(mul, 2, 2);
SetSubtreeCount(div, 2, 2);
SetSubtreeCount(mean, 2, 2);
SetSubtreeCount(log, 1, 1);
SetSubtreeCount(pow, 2, 2);
SetSubtreeCount(square, 1, 1);
SetSubtreeCount(root, 2, 2);
SetSubtreeCount(sqrt, 1, 1);
SetSubtreeCount(exp, 1, 1);
constants.ForEach((c) => SetSubtreeCount(c, 0, 0));
variables.ForEach((v) => SetSubtreeCount(v, 0, 0));
#endregion
var functions = new ISymbol[] { add, sub, mul, div, mean, log, pow, root, square, sqrt };
var terminalSymbols = variables.Concat<ISymbol>(constants);
var allSymbols = functions.Concat(terminalSymbols);
#region allowed child symbols configuration
foreach (var s in allSymbols) {
AddAllowedChildSymbol(StartSymbol, s);
}
foreach (var parentSymb in functions)
foreach (var childSymb in allSymbols) {
AddAllowedChildSymbol(parentSymb, childSymb);
}
#endregion
}
