/// <summary>
/// Finds the vectors most similar to the input vector. If the input is
/// the zero vector, an empty list is returned.
/// </summary>
/// <param name="vector">The input vector</param>
/// <param name="neighborhoodSize">The number of neighbors to retrieve</param>
/// <returns>A list of neighboring vectors sorted by descending cosine similarity</returns>
public List <Tuple <float, LabeledVector> > FindNearestNeighbors(float[] vector, int neighborhoodSize)
{
if (IsZero(vector))
{
return(null);
}
var nBestList = new NBestList <LabeledVector>(neighborhoodSize);
foreach (var wordVectorPair in _labeledVectorDictionary)
{
float cosine = LabeledVector.Cosine(wordVectorPair.Value, vector);
if (nBestList.IsBetter(cosine))
{
nBestList.Insert(cosine, new LabeledVector(wordVectorPair.Key, wordVectorPair.Value));
}
}
return(nBestList.GetSortedList());
}
public float Euclidean(LabeledVector otherVector)
{
return(Euclidean(otherVector.Vector));
}
public float Cosine(LabeledVector otherVector)
{
return(Cosine(otherVector.Vector));
}
public float InnerProduct(LabeledVector otherVector)
{
return(InnerProduct(otherVector.Vector));
}
/// <summary>
/// Finds the vectors most similar to the input vector. If the input is
/// the zero vector, an empty list is returned.
/// </summary>
/// <param name="vector">The input vector</param>
/// <param name="neighborhoodSize">The number of neighbors to retrieve</param>
/// <returns>A list of neighboring vectors sorted by descending cosine similarity</returns>
public List <Tuple <float, LabeledVector> > FindNearestNeighbors(LabeledVector vector, int neighborhoodSize)
{
return(FindNearestNeighbors(vector.Vector, neighborhoodSize));
}
public float Euclidean(LabeledVector otherVector)
{
return Euclidean(otherVector.Vector);
}
public float Cosine(LabeledVector otherVector)
{
return Cosine(otherVector.Vector);
}
public float InnerProduct(LabeledVector otherVector)
{
return InnerProduct(otherVector.Vector);
}
/// <summary>
/// Finds the vectors most similar to the input vector. If the input is
/// the zero vector, an empty list is returned.
/// </summary>
/// <param name="vector">The input vector</param>
/// <param name="neighborhoodSize">The number of neighbors to retrieve</param>
/// <returns>A list of neighboring vectors sorted by descending cosine similarity</returns>
public List<Tuple<float, LabeledVector>> FindNearestNeighbors(LabeledVector vector, int neighborhoodSize)
{
return FindNearestNeighbors(vector.Vector, neighborhoodSize);
}