depends, if you'd like to multiply matrices for each row in the data, then
you could use a breeze matrix, and do that locally on the nodes in a map or
similar.
if you'd like to multiply them across the rows, eg. a row in your data is a
row in the matrix, then you could use a distributed matrix lik
you probably better off defining your own data structure. labelled point can
store a label, vector. but in your case is more like a label, vector,
vector. i'd probably use tuples with breeze sparse arrays:
RDD[(label:Int, vector1:SparseArray[Double], vector2:SparseArray[Double])]
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