Computation of the Wasserstein distances between cluster centroid and signals in the cluster
IntraDist(X_cumsum, rowInd, colInd, C_cumsum)
is a Filebacked data cummulative sum matrix n x N
is a vector of the row indeces
is a vector of the column indeces
is a vector of the cummulative sum of the cluster centroid
The vector of the Wasserstein distances