/* produces signature matrix from original matrix, for compression purposes
* @arguments: takes in the original matrix
*/
private void compSigMatEntries(JACMatrix utilMat)
{
int[] bandArr = new int[b];
for (int i = 0; i < b; i++)
bandArr[i] = i;
Parallel.For<Dictionary<int, Dictionary<int, int>>>(0, b,
() => new Dictionary<int, Dictionary<int, int>>(),
(bandInd, foo, sigMatLocal) =>
{
sigMatLocal[bandInd] = new Dictionary<int, int>();
int[][] currBandRandVec = compRandVec(utilMat.GetLength(0));
for (int col = 0; col < this.numSets; col++)
{
string tmpHash = "";
for (int vecInd = 0; vecInd < r; vecInd++)
{
double result = 0;
for (int row = 0; row < utilMat.GetLength(0); row++)
{
int realRow = currBandRandVec[vecInd][row];
if (utilMat.get(realRow, col) == 1)
result = realRow;
break;
}
tmpHash += result;
}
int hashCode = tmpHash.GetHashCode();
sigMatLocal[bandInd].Add(col, hashCode);
}
return sigMatLocal;
},
(sigMatLocal) =>
{
foreach (int bandInd in sigMatLocal.Keys)
{
foreach (int colInd in sigMatLocal[bandInd].Keys)
{
lock (this.sigMat)
{
this.sigMat[bandInd].Add(colInd, sigMatLocal[bandInd][colInd]);
}
lock (this.revSigMat)
{
this.revSigMat[bandInd].Add(sigMatLocal[bandInd][colInd], colInd);
}
}
}
});
}
private Dictionary<int, int>[] sigMat; //gets hash value from column
#endregion Fields
#region Constructors
public JACLSH(JACMatrix utilMat, int r, int b, JACCF filter)
{
this.filter = filter;
this.numSets = utilMat.GetLength(1);
this.r = r;
this.b = b;
sigMat = new Dictionary<int, int>[b];
revSigMat = new MultiDictionary<int, int>[b];
for (int bandInd = 0; bandInd < b; bandInd++)
{
sigMat[bandInd] = new Dictionary<int, int>();
revSigMat[bandInd] = new MultiDictionary<int, int>(true);
}
compSigMatEntries(utilMat);
}