private static Convolution2D GetRandomFilter_Positive(bool isSquare)
{
Random rand = StaticRandom.GetRandomForThread();
var size = GetFilterSize(rand, isSquare);
double[] values = Enumerable.Range(0, size.Item1 * size.Item2).
Select(o => rand.NextDouble()).
ToArray();
values = Convolutions.ToUnit(values);
return(new Convolution2D(values, size.Item1, size.Item2, false));
}
private static Convolution2D GetRandomFilter_PosNeg(bool isSquare)
{
Random rand = StaticRandom.GetRandomForThread();
var size = GetFilterSize(rand, isSquare);
double[] values = Enumerable.Range(0, size.Item1 * size.Item2).
Select(o => rand.NextDouble(-1, 1)).
ToArray();
if (values.All(o => o > 0) || values.All(o => o < 0))
{
// They are all positive or all negative. Flip one of them
values[rand.Next(values.Length)] *= -1d;
}
values = Convolutions.ToUnit(values);
return(new Convolution2D(values, size.Item1, size.Item2, true));
}