private bool TryGetGroupSummaryMetrics(Dictionary <string, IDataView>[] metrics, out IDataView gs)
{
Host.AssertNonEmpty(metrics);
if (metrics.Length == 1)
{
return(metrics[0].TryGetValue(RankerEvaluator.GroupSummary, out gs));
}
gs = null;
var gsList = new List <IDataView>();
for (int i = 0; i < metrics.Length; i++)
{
IDataView idv;
if (!metrics[i].TryGetValue(RankerEvaluator.GroupSummary, out idv))
{
return(false);
}
idv = EvaluateUtils.AddFoldIndex(Host, idv, i, metrics.Length);
gsList.Add(idv);
}
gs = AppendRowsDataView.Create(Host, gsList[0].Schema, gsList.ToArray());
return(true);
}
