/**
* <summary>Gets bigram probability of given symbols.</summary>
* <param name="w1">first gram of bigram</param>
* <param name="w2">second gram of bigram</param>
* <returns>probability of bigram formed by w1 and w2.</returns>
*/
private double GetBiGramProbability(TSymbol w1, TSymbol w2)
{
try
{
return(rootNode.GetBiGramProbability(w1, w2));
}
catch (UnseenCase unseenCase)
{
return(_probabilityOfUnseen[1]);
}
}
/**
* <summary>Gets trigram probability of given symbols w1, w2 and w3.</summary>
*
* <param name="w1">first gram of trigram</param>
* <param name="w2">second gram of trigram</param>
* <param name="w3">third gram of trigram</param>
* <returns>probability of given trigram.</returns>
*/
public double GetTriGramProbability(TSymbol w1, TSymbol w2, TSymbol w3)
{
if (_children.ContainsKey(w1))
{
var child = _children[w1];
return(child.GetBiGramProbability(w2, w3));
}
if (_unknown != null)
{
return(_unknown.GetBiGramProbability(w2, w3));
}
throw new UnseenCase();
}