protected override IEnumerable<NeuralVectorFlow> DoGetNext(IndexSet indexes)
{
using (var ctx = new LeCunDataEntities())
{
var selectIndexes = indexes.ToDictionary(i => indexMap[i]);
foreach (var sample in (from s in ctx.Samples
where s.IsTraining == IsTraining && selectIndexes.Keys.Contains(s.ID)
select s))
{
yield return ToFlow(selectIndexes[sample.ID], sample);
}
}
}