/// <summary>
/// Determines the similarity of this message to the specified subsection of another one.
/// </summary>
/// <param name="other"></param>
/// <returns></returns>
private float GetSimilarity(Message other, float begin, float length)
{
double totalSimilarity = 1.0d;
int SampleCount = 20;
for (int i = 0; i < SampleCount; i++)
{
float fullPos = (float)i / (float)(SampleCount - 1);
float thisPos = fullPos;
float otherPos = begin + length * fullPos;
LargeVector localSample = this.SampleVector(thisPos);
LargeVector otherSample = other.SampleVector(otherPos);
float similarity = 0.1f;
if (!localSample.IsEmpty && !otherSample.IsEmpty)
{
float lengthA = localSample.GetLength();
float lengthB = otherSample.GetLength();
similarity = LargeVector.Dot(localSample, otherSample) / (lengthA * lengthB);
}
totalSimilarity *= (double)similarity;
}
return((float)Math.Pow(totalSimilarity, 5.0d / (double)SampleCount));
}
public float GetSimilarity(string wordA, string wordB)
{
LargeVector vecA = this.Get(wordA);
if (vecA.IsEmpty)
{
return(0.0f);
}
LargeVector vecB = this.Get(wordB);
if (vecB.IsEmpty)
{
return(0.0f);
}
float lengthA = vecA.GetLength();
float lengthB = vecB.GetLength();
return(LargeVector.Dot(vecA, vecB) / (lengthA * lengthB));
}