internal override Delegate CreateScoreGetter(DataViewRow input, out Action disposer)
{
disposer = null;
var getters = new ValueGetter <T> [Mappers.Length];
for (int i = 0; i < Mappers.Length; i++)
{
// First get the output row from the pipelines. The input predicate of the predictor
// is the output predicate of the pipeline.
var mapperColumns = Mappers[i].OutputSchema.Where(col => col.Name == DefaultColumnNames.Score);
var inputColumns = Mappers[i].GetDependenciesForNewColumns(mapperColumns);
var pipelineRow = BoundPipelines[i].GetRow(input, inputColumns);
// Next we get the output row from the predictors. We activate the score column as output predicate.
var predictorRow = Mappers[i].GetRow(pipelineRow, Enumerable.Repeat(Mappers[i].InputSchema[ScoreCols[i]], 1));
getters[i] = predictorRow.GetGetter <T>(predictorRow.Schema[ScoreCols[i]]);
disposer += predictorRow.Dispose;
}
var comb = _combiner.GetCombiner();
var buffer = new T[Mappers.Length];
ValueGetter <T> scoreGetter =
(ref T dst) =>
{
for (int i = 0; i < Mappers.Length; i++)
{
getters[i](ref buffer[i]);
}
comb(ref dst, buffer, null);
};
return(scoreGetter);
}
public override Delegate CreateScoreGetter(IRow input, Func <int, bool> mapperPredicate, out Action disposer)
{
disposer = null;
if (!mapperPredicate(0))
{
return(null);
}
var getters = new ValueGetter <T> [Mappers.Length];
for (int i = 0; i < Mappers.Length; i++)
{
// First get the output row from the pipelines. The input predicate of the predictor
// is the output predicate of the pipeline.
var inputPredicate = Mappers[i].GetDependencies(mapperPredicate);
var pipelineRow = BoundPipelines[i].GetRow(input, inputPredicate, out Action disp);
disposer += disp;
// Next we get the output row from the predictors. We activate the score column as output predicate.
var predictorRow = Mappers[i].GetRow(pipelineRow, col => col == ScoreCols[i], out disp);
disposer += disp;
getters[i] = predictorRow.GetGetter <T>(ScoreCols[i]);
}
var comb = _combiner.GetCombiner();
var buffer = new T[Mappers.Length];
ValueGetter <T> scoreGetter =
(ref T dst) =>
{
for (int i = 0; i < Mappers.Length; i++)
{
getters[i](ref buffer[i]);
}
comb(ref dst, buffer, null);
};
return(scoreGetter);
}