public override double Mutate(double value)
{
// Mutation equation Vm = V * s * r * 2^(-uk)
// where s = sign = {-1, +1) uniform random
// r = range
// u = [0..1] uniform random
// k = precision
int toss = Rng.DiscreteUniformZeroOrOne();
int sign = (toss == 0) ? -1 : +1;
double u = Rng.ContinuousUniformZeroToOne();
value += sign * r * Math.Pow(2.0, -u * k);
return(value);
}
/// <summary>
/// Randomly rotate or mirror the training sample matrix in-place
/// to remove orientation bias.
/// </summary>
/// <param name="matrix">The matrix to be processed</param>
/// <returns>The randomly modified matrix</returns>
private void DeBiasMatrix(double[] matrix, int centre, int matrixWidth)
{
// Flip X
if (Rng.DiscreteUniformZeroOrOne() == 1)
{
FlipP(matrix, centre, matrixWidth);
}
// Flip Y
if (Rng.DiscreteUniformZeroOrOne() == 1)
{
FlipQ(matrix, centre, matrixWidth);
}
// TODO: Could add rotation here or instead
}