Try using the Apache Mahout code that solves exactly this problem.
Mahout has a distributed row-wise matrix that is read one row at a time.
Dot products with the vector are computed and the results are collected.
This capability is used extensively in the large scale SVD's in Mahout.
On Tue, Ma
Hi all,
I was wondering how to go about doing a matrix-vector multiplication using
hadoop. I have my matrix in one file and my vector in another. All the map
tasks will need the vector file... basically they need to share it.
Basically I want my map function to output key-value pairs (i,m[i,j]*v(
