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Diffstat (limited to 'src/jcgp/backend/function/TravellingSalesmanFunctions.java')
| -rw-r--r-- | src/jcgp/backend/function/TravellingSalesmanFunctions.java | 396 |
1 files changed, 396 insertions, 0 deletions
diff --git a/src/jcgp/backend/function/TravellingSalesmanFunctions.java b/src/jcgp/backend/function/TravellingSalesmanFunctions.java new file mode 100644 index 0000000..472b7ad --- /dev/null +++ b/src/jcgp/backend/function/TravellingSalesmanFunctions.java @@ -0,0 +1,396 @@ +package jcgp.backend.function; + +public class TravellingSalesmanFunctions extends FunctionSet { + + public TravellingSalesmanFunctions() { + name = "Travelling salesman functions"; + functionList = new Function[]{ + new SquareRoot(), + new Square(), + new Cube(), + new ScaledExponential(), + new AbsoluteSineAB(), + new AbsoluteCosineAB(), + new AbsoluteHyperbolicTangentAB(), + new ScaledHypotenuse(), + new ScaledAddition(), + new SymmetricSubtraction(), + new Multiplication(), + new BoundedDivision() }; + + enableAll(); + } + + /** + * Protected square root function, returns the square root of the absolute + * value of input 0. + * + * @see Math + */ + public static class SquareRoot extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + return Math.sqrt(Math.abs(in0)); + } + } + + @Override + public int getArity() { + return 1; + } + + @Override + public String toString() { + return "Square root"; + } + } + + /** + * Square function, returns the square of the + * value of input 0. + * + */ + public static class Square extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + return in0 * in0; + } + } + + @Override + public int getArity() { + return 1; + } + + @Override + public String toString() { + return "Square"; + } + } + + /** + * Cube function, returns the value of input 0 cubed. + * + */ + public static class Cube extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + return in0 * in0 * in0; + } + } + + @Override + public int getArity() { + return 1; + } + + @Override + public String toString() { + return "Cube"; + } + } + + /** + * Scaled exponential function. Returns the exponential of input 0 + * scaled to the range 0 < x < 1. + * + * @see Math + */ + public static class ScaledExponential extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + return (Math.exp(in0) - 1) / (Math.exp(-1) - 1); + } + } + + @Override + public int getArity() { + return 1; + } + + @Override + public String toString() { + return "Scaled Exp"; + } + } + + /** + * Sine of sum. Returns the absolute value of the sine + * of the sum of inputs 0 and 1, in radians. + * + * @see Math + */ + public static class AbsoluteSineAB extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + Double in1 = ((Double) args[1]); + return Math.abs(Math.sin(in0 + in1)); + } + } + + @Override + public int getArity() { + return 2; + } + + @Override + public String toString() { + return "Abs Sin(a+b)"; + } + } + + /** + * Cosine of sum. Returns the absolute value of the cosine + * of the sum of inputs 0 and 1, in radians. + * + * @see Math + */ + public static class AbsoluteCosineAB extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + Double in1 = ((Double) args[1]); + return Math.abs(Math.cos(in0 + in1)); + } + } + + @Override + public int getArity() { + return 2; + } + + @Override + public String toString() { + return "Abs Cos(a+b)"; + } + } + + /** + * Hyperbolic tangent of sum. Returns the absolute value of the sine + * of the sum of inputs 0 and 1, in radians. + * + * @see Math + */ + public static class AbsoluteHyperbolicTangentAB extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + Double in1 = ((Double) args[1]); + return Math.abs(Math.tanh(in0 + in1)); + } + } + + @Override + public int getArity() { + return 2; + } + + @Override + public String toString() { + return "Abs Tanh(a+b)"; + } + } + + /** + * Scaled hypotenuse function. Returns the square root of input 0 squared + * plus input 1 squared, scaled to the range 0 < x < 1. + * + * @see Math + */ + public static class ScaledHypotenuse extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + Double in1 = ((Double) args[1]); + return Math.hypot(in0, in1) / Math.sqrt(2); + } + } + + @Override + public int getArity() { + return 2; + } + + @Override + public String toString() { + return "Scaled Hypotenuse"; + } + } + + /** + * Scaled addition returns the sum of inputs 0 and 1 scaled + * to the range 0 < x < 1. + * + */ + public static class ScaledAddition extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + Double in1 = ((Double) args[1]); + return (in0 + in1) / 2.0; + } + } + + @Override + public int getArity() { + return 2; + } + + @Override + public String toString() { + return "Scaled Addition"; + } + } + + /** + * Symmetric subtraction returns the absolute difference between inputs 0 and 1, + * scaled to the range 0 < x < 1. + * + */ + public static class SymmetricSubtraction extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + Double in1 = ((Double) args[1]); + return Math.abs(in0 - in1) / 2.0; + } + } + + @Override + public int getArity() { + return 2; + } + + @Override + public String toString() { + return "Symmetric Subtraction"; + } + } + + /** + * Multiplication returns the product of inputs 0 and 1. + * + */ + public static class Multiplication extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + Double in1 = ((Double) args[1]); + return in0 * in1; + } + } + + @Override + public int getArity() { + return 2; + } + + @Override + public String toString() { + return "Multiplication"; + } + } + + /** + * Multiplication returns the product of inputs 0 and 1, squared. + * + */ + public static class SquaredMultiplication extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = ((Double) args[0]); + Double in1 = ((Double) args[1]); + return in0 * in1 * in0 * in1; + } + } + + @Override + public int getArity() { + return 2; + } + + @Override + public String toString() { + return "Squared Multiplication"; + } + } + + /** + * Bounded division, returns the quotient of the two inputs where the larger + * is the denominator. + * + */ + public static class BoundedDivision extends Function { + @Override + public Double run(Object... args) { + if (args.length < getArity()) { + throw new IllegalArgumentException(toString() + " received " + args.length + " arguments but arity is " + getArity() + "."); + } else { + Double in0 = Math.abs((Double) args[0]); + Double in1 = Math.abs((Double) args[1]); + Double result; + + if (in1 < 1e-10) { + result = 1.0; + } else if (in1 > in0) { + result = in0 / in1; + } else { + result = in1 / in0; + } + + return result; + } + } + + @Override + public int getArity() { + return 2; + } + + @Override + public String toString() { + return "Bounded Division"; + } + } +} |