private static bool[] Classify(SVInfo[] sVecs, Datum[] testData, Func<Rational[], Rational[], Rational> kernel, Rational w0)
{
var foo = testData
.Select(d => {
var tmp = sVecs.Select(sv => sv.alpha * sv.y * kernel(sv.x, d.x)).Aggregate((acc, r) => acc + r) + w0;
return tmp * d.y > 0;//numeric instability mignt make tmp not qute be -1/+1.
})
.ToArray();
return foo;
}