/// <summary>
/// Run our VB implementation of the Semi Parametric Latent Factor Model of
/// Teh, Y., Seeger, M., and Jordan, M. (AISTATS 2005).
/// </summary>
public SPLFM_VMP RunSPLFM_VMP(Vector[] inputs,
double[,] data,
bool[,] isMissing,
Settings settings,
string[] errorMeasureNames = null,
Converter <IPredictionSPLFMModel, double[]> modelAssessor = null,
string swfn = null)
{
var model = new SPLFM_VMP();
var nodeOptimiser = new KernelOptimiser(settings);
nodeOptimiser.xData = inputs;
nodeOptimiser.kernel = ObjectCloner.Clone(settings.node_kernel);
nodeOptimiser.hypersToOptimise = settings.nodeHypersToOptimise;
var nodeFunctionsInit = Enumerable.Range(0, settings.Q).Select(i =>
VectorGaussian.FromMeanAndVariance(
VectorGaussian.Sample(Vector.Zero(data.GetLength(1)), PositiveDefiniteMatrix.IdentityScaledBy(data.GetLength(1), 100)),
PositiveDefiniteMatrix.IdentityScaledBy(data.GetLength(1), settings.init_precision))).ToArray(); // should put this manually in generated code
var distArray = Distribution <Vector> .Array(nodeFunctionsInit);
double inputsRange
= inputs.Select(i => i[0]).Max() - inputs.Select(i => i[0]).Min();
Console.WriteLine("Init node kernel {0}", settings.node_kernel);
model.SetObservedValue("D", data.GetLength(0));
model.SetObservedValue("Q", settings.Q);
model.SetObservedValue("N", data.GetLength(1));
model.SetObservedValue("observedData", data);
model.SetObservedValue("nodeFunctionsInitVar", distArray);
model.SetObservedValue("K_node_inverse", Utils.GramMatrix(nodeOptimiser.kernel, inputs).Inverse());
model.SetObservedValue("noisePrecisionPrior", settings.noisePrecisionPrior);
//model.SetObservedValue("nodeNoisePrecisionPrior", settings.nodeNoisePrecisionPrior);
model.SetObservedValue("nodeSignalPrecisionsPrior", Enumerable.Range(0, settings.Q).Select(o => settings.nodeSignalPrecisionsPrior).ToArray());
model.SetObservedValue("isMissing", isMissing);
model.nodeKernelOptimiser = nodeOptimiser;
model.Reset();
var start = DateTime.Now;
if (swfn != null)
{
using (var sw = new StreamWriter(swfn, true))
{
sw.Write("{0} {1} {2}", "it", "time", "ml");
if (errorMeasureNames != null)
{
sw.Write(" " + errorMeasureNames.Aggregate((p, q) => p + " " + q));
}
sw.Write(" " + Utils.KernelHyperNames(nodeOptimiser.kernel).Select(o => "node_" + o).Aggregate((p, q) => p + " " + q));
sw.Write(" noise");
for (int i = 0; i < settings.Q; i++)
{
sw.Write(" signal" + i);
}
sw.WriteLine();
}
}
double oldML = double.NegativeInfinity;
double ml = 0;
int it = 0;
for (; it < settings.max_iterations; it++)
{
model.Update(1);
ml = model.Marginal <Bernoulli>("ev").LogOdds;
var noisePrecisionPost = model.Marginal <Gamma>("noisePrecision");
var assessment = (modelAssessor != null) ? modelAssessor(model).Select(o => o.ToString()).Aggregate((p, q) => p + " " + q) : "";
Console.WriteLine("It " + it + " node " + nodeOptimiser.kernel + " ml " + ml + " err " + assessment);
if (Math.Abs(oldML - ml) < settings.ml_tolerance)
{
break;
}
oldML = ml;
if (swfn != null)
{
using (var sw = new StreamWriter(swfn, true))
{
var nodeSignalPrecisionsPost = model.Marginal <Gamma[]>("nodeSignalPrecisions");
sw.Write("{0} {1} {2}", it, (DateTime.Now - start).TotalMilliseconds, ml);
if (modelAssessor != null)
{
sw.Write(" " + assessment);
}
sw.Write(" " + Utils.KernelToArray(nodeOptimiser.kernel).Select(o => o.ToString()).Aggregate((p, q) => p + " " + q));
sw.Write(" " + noisePrecisionPost.GetMeanInverse());
for (int i = 0; i < settings.Q; i++)
{
sw.Write(" " + nodeSignalPrecisionsPost[i].GetMeanInverse());
}
sw.WriteLine();
}
}
}
Console.WriteLine("Finished after " + it);
return(model);
}
/// <summary>
/// Run GPRN without node noise
/// </summary>
/// <param name="inputs">Covariates X</param>
/// <param name="data">Outputs Y</param>
/// <param name="settings">Algorithm settings</param>
/// <param name="swfn">Filename for logging</param>
/// <returns>Fitted model</returns>
public GPRN_VMP NetworkModelCA(Vector[] inputs,
double[,] data,
Settings settings,
string swfn = null)
{
bool anyIsMissing = false; // AnyIsMissing(isMissing);
var model = new GPRN_VMP();
var nodeOptimiser = new KernelOptimiser(settings);
var weightOptimiser = new KernelOptimiser(settings);
nodeOptimiser.xData = inputs;
weightOptimiser.xData = inputs;
nodeOptimiser.kernel = ObjectCloner.Clone(settings.node_kernel);
nodeOptimiser.hypersToOptimise = settings.nodeHypersToOptimise;
weightOptimiser.kernel = ObjectCloner.Clone(settings.weight_kernel);
weightOptimiser.hypersToOptimise = settings.weightHypersToOptimise;
var nodeFunctionsInit = Enumerable.Range(0, settings.Q).Select(i =>
VectorGaussian.FromMeanAndVariance(
VectorGaussian.Sample(Vector.Zero(data.GetLength(1)), PositiveDefiniteMatrix.IdentityScaledBy(data.GetLength(1), 100)),
PositiveDefiniteMatrix.IdentityScaledBy(data.GetLength(1), settings.init_precision))).ToArray(); // should put this manually in generated code
var distArray = Distribution <Vector> .Array(nodeFunctionsInit);
double inputsRange
= inputs.Select(i => i[0]).Max() - inputs.Select(i => i[0]).Min();
Console.WriteLine("Init node kernel {0}\ninit weight kernel {1}", settings.node_kernel, settings.weight_kernel);
model.SetObservedValue("D", data.GetLength(0));
model.SetObservedValue("Q", settings.Q);
model.SetObservedValue("N", data.GetLength(1));
model.SetObservedValue("observedData", data);
model.SetObservedValue("nodeFunctionsInitVar", distArray);
model.SetObservedValue("K_node_inverse", Utils.GramMatrix(nodeOptimiser.kernel, inputs).Inverse());
model.SetObservedValue("K_weights_inverse", Utils.GramMatrix(weightOptimiser.kernel, inputs).Inverse());
model.SetObservedValue("noisePrecisionPrior", settings.noisePrecisionPrior);
//model.SetObservedValue("nodeNoisePrecisionPrior", settings.nodeNoisePrecisionPrior);
model.SetObservedValue("nodeSignalPrecisionsPrior", settings.nodeSignalPrecisionsPrior);
//model.SetObservedValue("isMissing", isMissing);
model.nodeKernelOptimiser = nodeOptimiser;
model.weightKernelOptimiser = weightOptimiser;
model.Reset();
var start = DateTime.Now;
if (swfn != null)
{
using (var sw = new StreamWriter(swfn, true))
{
sw.Write("{0} {1} {2}", "it", "time", "ml");
if (anyIsMissing)
{
sw.Write(" {0} {1}", "logProb", "error");
}
sw.Write(" " + Utils.KernelHyperNames(nodeOptimiser.kernel).Select(o => "node_" + o).Aggregate((p, q) => p + " " + q));
sw.Write(" " + Utils.KernelHyperNames(weightOptimiser.kernel).Select(o => "weight_" + o).Aggregate((p, q) => p + " " + q));
sw.Write(" noise");
for (int i = 0; i < settings.Q; i++)
{
sw.Write(" signal" + i);
}
sw.WriteLine();
}
}
double oldML = double.NegativeInfinity;
double ml = 0;
int it = 0;
for (; it < settings.max_iterations; it++)
{
model.Update(1);
ml = model.Marginal <Bernoulli>("ev").LogOdds;
var noisePrecisionPost = model.Marginal <Gamma>("noisePrecision");
double logProb = 0, error = 0, MSLL = 0, SMSE = 0;
Console.WriteLine("It {9} Time: {8:G3} Node ls=exp({0:G3})={1:G3} Weight ls=exp({2:G3})={3:G3} ml={4:G3} error={5:G3} msll={6:G3} smse={7:G3}", nodeOptimiser.kernel[0], Math.Exp(nodeOptimiser.kernel[0]),
weightOptimiser.kernel[0], Math.Exp(weightOptimiser.kernel[0]), ml, error, MSLL, SMSE, (DateTime.Now - start).TotalMilliseconds, it);
if (Math.Abs(oldML - ml) < settings.ml_tolerance)
{
break;
}
oldML = ml;
if (swfn != null)
{
using (var sw = new StreamWriter(swfn, true))
{
var nodeSignalPrecisionsPost = model.Marginal <Gamma[]>("nodeSignalPrecisions");
sw.Write("{0} {1} {2}", it, (DateTime.Now - start).TotalMilliseconds, ml);
if (anyIsMissing)
{
sw.Write(" {0} {1}", logProb, error);
}
sw.Write(" " + Utils.KernelToArray(nodeOptimiser.kernel).Select(o => o.ToString()).Aggregate((p, q) => p + " " + q));
sw.Write(" " + Utils.KernelToArray(weightOptimiser.kernel).Select(o => o.ToString()).Aggregate((p, q) => p + " " + q));
sw.Write(" " + noisePrecisionPost.GetMeanInverse());
for (int i = 0; i < settings.Q; i++)
{
sw.Write(" " + nodeSignalPrecisionsPost[i].GetMeanInverse());
}
sw.WriteLine();
}
}
}
Console.WriteLine("Finished after " + it);
return(model);
}
