/// <summary>
/// Debug Process, make sure values line up with LISP code
/// </summary>
/// <param name="voNode">Node we are updating</param>
/// <param name="voArc">current arc</param>
/// <param name="voArcNode">the arc node</param>
/// <param name="vsProgress">message</param>
public void DebugProgress(BeliefNode voNode, Arc voArc, BeliefNode voArcNode,string vsProgress)
{
Console.Out.WriteLine(string.Format("{0} update of {1} along arc ({2} {3} {4}) with prior odds {5}", vsProgress, voNode.Name, voArc.Name, voArc.Sufficiency, voArc.Neccessity, voNode.PriorOdds));
Console.Out.WriteLine(string.Format("The prior and current prob of E are {0}, {1}", voArcNode.PriorProbability, voArcNode.CurrentProbability));
}
/// <summary>
/// Returnes Updates for the Probability
/// </summary>
/// <param name="voBeliefNode">The BeliefNode</param>
/// <param name="voArc">Arc to Evaluate</param>
/// <returns>Updated Probability</returns>
public float UpdateProbability(BeliefNode voBeliefNode, Arc voArc)
{
BeliefNode arcNode = moNodes.GetBelief(voArc.Name);
float fUpdatedValue = 0.0f;
if (arcNode.CurrentProbability > arcNode.PriorProbability)
{
DebugProgress(voBeliefNode,voArc,arcNode,"Supporting arc");
fUpdatedValue = (float)(voBeliefNode.PriorProbability +
((Utility.CalculateProbability(voArc.Sufficiency * voBeliefNode.PriorOdds) - voBeliefNode.PriorProbability)
/
(1.0 - arcNode.PriorProbability) * (arcNode.CurrentProbability - arcNode.PriorProbability)));
}
else
{
DebugProgress(voBeliefNode, voArc, arcNode, "Inhibiting arc");
fUpdatedValue =
((Utility.CalculateProbability(voArc.Neccessity * voBeliefNode.PriorOdds)) +
(voBeliefNode.PriorProbability - Utility.CalculateProbability(voArc.Neccessity * voBeliefNode.PriorOdds))
/
arcNode.PriorProbability
*
arcNode.CurrentProbability);
}
return fUpdatedValue;
}
/// <summary>
/// Calcualtes the Effective Arc Lambda
/// </summary>
/// <param name="voArc">Single Arc</param>
/// <returns>Calculate Lambda</returns>
public float CalculateEffectiveArcLambda(BeliefNode voBeliefNode, Arc voArc)
{
return Utility.CalculateOdds(UpdateProbability(voBeliefNode, voArc)) / voBeliefNode.PriorOdds;
}