Ocronet.Dynamic.OcroFST.FstUtil.sample_by_costs C# (CSharp) Method

        public static int sample_by_costs(Floatarray costs)
        {
            Doublearray p = new Doublearray();
            p.Copy(costs);
            double mincost = NarrayUtil.Min(costs);
            p -= mincost;

            for (int i = 0; i < p.Length(); i++)
                p.UnsafePut1d(i, Math.Exp(-p.UnsafeAt1d(i)));
            double sump = NarrayUtil.Sum(p);
            p /= sump;

            double choice = rnd.NextDouble();
            double s = 0;
            for (int i = 0; i < p.Length(); i++)
            {
                s += p[i];
                if (choice < s)
                    return i;
            }

            // shouldn't happen...
            return costs.Length() - 1;
        }