public static IGram InitBackOffNGram(int n, float weightMultiplier)
{
Assert.IsTrue(n >= 1);
IGram gram;
if (n == 1)
{
gram = new UniGram();
}
else
{
gram = new BackOffNGram(n, weightMultiplier);
}
return(gram);
}
public CompiledBackOffNGram(BackOffNGram gram)
{
weightMultiplier = gram.CompiledMemoryUpdate;
CompiledGrammars = new ICompiledGram[gram.N];
Weights = new float[gram.N];
n = gram.N;
float weightSum = 0f;
float currentWeight = 1f;
for (int grammarSize = gram.N - 1; grammarSize >= 0; --grammarSize)
{
CompiledGrammars[grammarSize] = gram.Grammars[grammarSize].Compile();
currentWeight *= weightMultiplier;
weightSum += currentWeight;
Weights[grammarSize] = currentWeight;
}
for (int i = 0; i < Weights.Length; ++i)
{
Weights[i] /= weightSum;
}
}