We have following peace of code:
https://github.com/dotnet/machinelearning/blob/master/src/Microsoft.ML.Data/Evaluators/QuantileRegressionEvaluator.cs

It looks like specific type of evaluation for regression task, but we don't expose it at all.
Shall we do it for v1.0?
@TomFinley @rogancarr