public override IEstimator <ITransformer> Reconcile(IHostEnvironment env,
PipelineColumn[] toOutput,
IReadOnlyDictionary <PipelineColumn, string> inputNames,
IReadOnlyDictionary <PipelineColumn, string> outputNames,
IReadOnlyCollection <string> usedNames)
{
// For the moment, the concat estimator can only do one concatenation at a time.
// So we will chain the estimators.
Contracts.AssertNonEmpty(toOutput);
IEstimator <ITransformer> est = null;
for (int i = 0; i < toOutput.Length; ++i)
{
var ccol = (IConcatCol)toOutput[i];
string[] inputs = ccol.Sources.Select(s => inputNames[s]).ToArray();
var localEst = new ConcatEstimator(env, outputNames[toOutput[i]], inputs);
if (i == 0)
{
est = localEst;
}
else
{
est = est.Append(localEst);
}
}
return(est);
}
