protected override Delegate GetPredictedLabelGetter(IRow output, out Delegate scoreGetter)
{
Contracts.AssertValue(output);
Contracts.Assert(output.Schema == Bindings.RowMapper.Schema);
Contracts.Assert(output.IsColumnActive(Bindings.ScoreColumnIndex));
ValueGetter <VBuffer <Float> > mapperScoreGetter = output.GetGetter <VBuffer <Float> >(Bindings.ScoreColumnIndex);
long cachedPosition = -1;
VBuffer <Float> score = default(VBuffer <Float>);
int scoreLength = Bindings.PredColType.KeyCount;
ValueGetter <uint> predFn =
(ref uint dst) =>
{
EnsureCachedPosition(ref cachedPosition, ref score, output, mapperScoreGetter);
Contracts.Check(score.Length == scoreLength);
int index = VectorUtils.ArgMin(ref score);
if (index < 0)
{
dst = 0;
}
else
{
dst = (uint)index + 1;
}
};
ValueGetter <VBuffer <Float> > scoreFn =
(ref VBuffer <Float> dst) =>
{
EnsureCachedPosition(ref cachedPosition, ref score, output, mapperScoreGetter);
Contracts.Check(score.Length == scoreLength);
score.CopyTo(ref dst);
};
scoreGetter = scoreFn;
return(predFn);
}