// /// <summary>
// /// Gets the value of information.
// /// </summary>
// /// <value>The value of information.</value>
// public double[] GetValueOfInformation()
// {
// double jall = JAll();
// return Unlabelled.Select(index => VOI(jall, index)).ToArray();
// }
/// <summary>
/// Gets the argument maxising the Value of information.
/// </summary>
/// <param name="activityPosteriors">Activity posteriors.</param>
/// <param name="priors">Priors.</param>
/// <param name="argMax">Argument max.</param>
/// <param name="maxVal">Max value.</param>
public override void GetArgMaxVOI(Bernoulli[] activityPosteriors, Marginals priors, out int argMax, out double maxVal)
{
hypothesisActivityPosteriors = activityPosteriors.Select(ia => new Bernoulli(ia)).ToArray();
double jall = JAll();
var unlabelled = Unlabelled.ToArray();
argMax = -1;
maxVal = Reversed ? double.PositiveInfinity : double.NegativeInfinity;
var signs = new double[unlabelled.Length];
var vois = new double[unlabelled.Length];
for (int i = 0; i < unlabelled.Length; i++)
{
var index = unlabelled[i];
vois[i] = VOI(jall, index, activityPosteriors, priors);
signs[i] = Math.Sign(vois[i]) / 2.0 + 0.5;
//Console.Write( "." );
//Console.WriteLine( "y_true: {0}", labels[0][ind] );
//Console.WriteLine( "y_hat: {0}", probs[ind] );
//Console.WriteLine( "VOJ_{0}: {1}", ind, voi );
//Console.WriteLine();
if (Reversed)
{
if (vois[i] < maxVal || argMax < 0)
{
maxVal = vois[i];
argMax = index;
}
}
else
{
if (vois[i] > maxVal || argMax < 0)
{
maxVal = vois[i];
argMax = index;
}
}
}
//Console.WriteLine();
//Console.WriteLine( "\n+ivity: {0}", signs.Average() );
}
/// <summary>
/// Gets the argument maxising the Value of information.
/// </summary>
/// <param name="activityPosteriors">Activity posteriors.</param>
/// <param name="priors">Priors.</param>
/// <param name="argMax">Argument max.</param>
/// <param name="maxVal">Max value.</param>
public override void GetArgMaxVOI(Bernoulli[] activityPosteriors, Marginals priors, out int argMax, out double maxVal)
{
argMax = Unlabelled.ToArray()[random.Next(Unlabelled.Count)];
maxVal = 0.0;
}