public IndexedVector(SortedList <int, float> dictionary, int numOfDimensions, string label = null)
{
var tuples = new Tuple <int, float> [Math.Min(dictionary.Count, numOfDimensions)];
var i = 0;
foreach (var p in dictionary)
{
if (i == numOfDimensions)
{
break;
}
tuples[i++] = new Tuple <int, float>(p.Key, p.Value);
}
Value = CreateVector.SparseOfIndexed(numOfDimensions, tuples);
Label = label;
}
public IndexedVector(SortedList <int, float> dictionary, int vectorWidth, Memory <char>?data = null)
{
var tuples = new Tuple <int, float> [Math.Min(dictionary.Count, vectorWidth)];
var i = 0;
foreach (var p in dictionary)
{
if (i == vectorWidth)
{
break;
}
tuples[i++] = new Tuple <int, float>(p.Key, p.Value);
}
Value = CreateVector.SparseOfIndexed(vectorWidth, tuples);
ComponentCount = tuples.Length;
Data = data;
}
public double CosAngle(IVector vector, long vectorOffset, int componentCount, Stream vectorStream)
{
Span <byte> buf = new byte[componentCount * 2 * sizeof(float)];
vectorStream.Seek(vectorOffset, SeekOrigin.Begin);
vectorStream.Read(buf);
var index = MemoryMarshal.Cast <byte, int>(buf.Slice(0, componentCount * sizeof(int)));
var values = MemoryMarshal.Cast <byte, float>(buf.Slice(componentCount * sizeof(float)));
var tuples = new Tuple <int, float> [componentCount];
for (int i = 0; i < componentCount; i++)
{
tuples[i] = new Tuple <int, float>(index[i], values[i]);
}
var otherVector = CreateVector.SparseOfIndexed(VectorWidth, tuples);
var dotProduct = vector.Value.DotProduct(otherVector);
var dotSelf1 = vector.Value.DotProduct(vector.Value);
var dotSelf2 = otherVector.DotProduct(otherVector);
return(dotProduct / (Math.Sqrt(dotSelf1) * Math.Sqrt(dotSelf2)));
}
public IndexedVector(Tuple <int, float>[] tuples, int vectorWidth, string label = null)
{
Value = CreateVector.SparseOfIndexed(vectorWidth, tuples);
}
public IndexedVector(Tuple <int, float>[] tuples, int vectorWidth)
{
Value = CreateVector.SparseOfIndexed(vectorWidth, tuples);
ComponentCount = tuples.Length;
}
public IndexedVector(Tuple <int, float>[] tuples, int numOfDimensions, object label = null)
{
Value = CreateVector.SparseOfIndexed(numOfDimensions, tuples);
Label = label;
}
