public SparseVector <double> Trim(SparseVector <double> vec, int size, double cutPerc)
{
SparseVector <double> trimmed = vec;
if (vec.Count > size)
{
ArrayList <KeyDat <double, int> > tmp = new ArrayList <KeyDat <double, int> >(vec.Count);
foreach (IdxDat <double> item in vec)
{
tmp.Add(new KeyDat <double, int>(item.Dat, item.Idx));
}
tmp.Sort(DescSort <KeyDat <double, int> > .Instance);
tmp.RemoveRange(size, tmp.Count - size);
ArrayList <IdxDat <double> > tmp2 = new ArrayList <IdxDat <double> >();
foreach (KeyDat <double, int> item in tmp)
{
tmp2.Add(new IdxDat <double>(item.Dat, item.Key));
}
tmp2.Sort();
trimmed = new SparseVector <double>(tmp2);
}
ModelUtils.CutLowWeights(ref trimmed, cutPerc);
ModelUtils.TryNrmVecL2(trimmed);
return(trimmed);
}