protected virtual double[] AdjustTargetsAndSetWeights(IChannel ch)
{
if (_gradientWrapper == null)
{
return(GetGradient(ch));
}
else
{
double[] targetWeights = null;
double[] targets = _gradientWrapper.AdjustTargetAndSetWeights(GetGradient(ch), ObjectiveFunction, out targetWeights);
Dataset.DatasetSkeleton dsSkeleton = TrainingScores.Dataset.Skeleton;
return(targets);
}
}
/// <summary>
/// Attempts to create a feature from a ulong array. The intent
/// is that this will handle query ID.
/// </summary>
public static TsvFeature CreateFeatureFromQueryId(Dataset.DatasetSkeleton skel)
{
Dictionary <uint, int> uvalToOrder = new Dictionary <uint, int>();
foreach (uint uintQid in skel.QueryIds.Select(qid => (uint)qid).Distinct().OrderBy(x => x))
{
uvalToOrder[uintQid] = uvalToOrder.Count;
}
IntArray bins = IntArray.New(
skel.NumDocs, IntArrayType.Dense, IntArray.NumBitsNeeded(uvalToOrder.Count),
skel.QueryIds.SelectMany((qid, i) =>
Enumerable.Repeat(uvalToOrder[(uint)qid], skel.Boundaries[i + 1] - skel.Boundaries[i])));
uint[] valueMap = uvalToOrder.Keys.OrderBy(x => x).ToArray(uvalToOrder.Count);
return(new TsvFeature(bins, valueMap, "m:QueryId"));
}