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From Sebastian Schelter <...@apache.org>
Subject Re: Matrix to Matrix Distance
Date Fri, 10 Dec 2010 07:10:11 GMT
I'm curious about your usecase, could you give us some details?

--sebastian

2010/12/10 Ted Dunning <ted.dunning@gmail.com>

> This sounds like a map side join.  Put all of A into memory and have the
> mappers compare vectors
> of B to all rows of A.
>
> 2010/12/9 Fernando Fernández <fernando.fernandez.gonzalez@gmail.com>
>
> > Hi everyone,
> >
> > I'm facing a problem where I should compute, not the pair-wise distances
> of
> > the rows of a matrix, but the distances of each row of an small matrix (A
> > ~1000 rows) to all the rows of a big matrix (B ~100000 rows), to
> determine
> > the nearest elements of B for each row of A. Is there an easy way to do
> > this
> > in Mahout? (besides putting rows of A and B into a big matrix (C) and
> > launching a rowsimilarityjob, which would be very inefficient).
> >
> >
> > Thanks in advance.
> >
> > Fernando.
> >
>

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