internal CountMinSketch(CountMinSketchState state)
{
this.epsilon = state.Epsilon;
this.delta = state.Delta;
this.Width = (uint)(Math.Ceiling(Math.E / state.Epsilon));
this.Depth = (uint)(Math.Ceiling(Math.Log(1 / state.Delta)));
lock (_lock)
{
this.Matrix = state.Matrix;
}
this.Hash = Defaults.GetDefaultHashAlgorithm();
}
public CountMinSketch Deserialize(Stream stream)
{
using (var br = new BinaryReader(stream))
{
int dataFormatMajorVersion = br.ReadUInt16();
int dataFormatMinorVersion = br.ReadUInt16();
AssertDataVersionCanBeRead(dataFormatMajorVersion, dataFormatMinorVersion);
var count = br.ReadUInt64();
var epsilon = br.ReadDouble();
var delta = br.ReadDouble();
var width = (uint)(Math.Ceiling(Math.E / epsilon));
var depth = (uint)(Math.Ceiling(Math.Log(1 / delta)));
var matrix = new ulong[depth][];
for (var i = 0; i < depth; i++)
{
matrix[i] = new ulong[width];
for (var j = 0; j < width; j++)
{
var element = br.ReadUInt64();
matrix[i][j] = element;
}
}
var data = new CountMinSketchState
{
Count = count,
Epsilon = epsilon,
Delta = delta,
Matrix = matrix
};
var result = new CountMinSketch(data);
return(result);
}
}
