/// <summary>
/// Build a nice plot of the training value
/// </summary>
/// <param name="source"></param>
/// <returns></returns>
internal static IFutureValue<ROOTNET.NTH1F> MakeNNPlot (this IQueryable<TrainingTree> source, Method<TrainingTree> m)
{
// Argument check
if (!m.WeightFile.Exists)
{
throw new ArgumentException($"File {m.WeightFile.FullName} can't be located.");
}
// Generate a pretty detailed plot
var mvaCalc = m.GetMVAValue();
return source
.FuturePlot("mva_weights", "MVA Output Weights", 10000, -1.0, 1.0, t => mvaCalc.Invoke(t), weight: t => t.Weight);
}