public void TestDistanceDecrease2()
{
var dimension = 5;
var entropySketch = new EntropySketchFunction(dimension);
var befVector = ArrayUtils.Init(-1.0, -2.0, -3.0, -4.0, -5.0).ToVector();
var afVector = ArrayUtils.Init(-0.5, -2.0, -3.0, -4.0, -5.0).ToVector();
var befEntropySketchValue = entropySketch.ComputeEntropySketch(befVector);
var afEntropySketchValue = entropySketch.ComputeEntropySketch(afVector);
var distL1 = (afVector - befVector).L1Norm();
var distance =
DecreaseEntropySketch.l1DecreaseEntropySketchTo(befVector, dimension, afEntropySketchValue,
Approximations.ApproximationEpsilon);
var resultMSE = Math.Pow(distance - distL1, 2);
Assert.AreEqual(resultMSE, 0.0, 0.00001);
}
public ConvexBound LowerBound(Vector reducedVector, double threshold)
{
Either <Vector, double> DistanceL1(Vector point, int node)
{
var functionValue = ComputeEntropySketch(point);
if (functionValue > threshold)
{
return(DecreaseEntropySketch.l1DecreaseEntropySketchTo(point, Dimension, threshold, Approximations.ApproximationEpsilon));
}
if (functionValue < threshold)
{
return(IncreaseEntropySketch.l1IncreaseEntropySketchTo(point, Dimension, threshold, Approximations.ApproximationEpsilon));
}
return(point);
}
return(ConvexBoundBuilder.Create(MonitoredFunction.Function, ComputeEntropySketch, ConvexBound.Type.LoweBound, threshold)
.WithDistanceNorm(1, DistanceL1)
.ToConvexBound());
}