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From Yang <>
Subject SVD, how are the missing values treated?
Date Wed, 11 Sep 2013 00:48:37 GMT
in the simple equation describing SVD:


I guess the original matrix A has to have every value filled, so that
mathematics will be able to carry out the calculation, right?

but the mahout package described here:

allows for input to be sparse, so most elements of A are missing values. so
I wonder how mahout takes care of the missing values? this paper:
fills missing values with some sort of averages, which sounds rather


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