On 12.11.2011 11:26, Sean Owen wrote: > Looking at the uses of it, I think it receives as input vectors that > are "non overlapping" and is just stitching them together, so yes it's > correct. > But Sebastian can double-check.
It is used exactly as Sean says. It is applied in the first pass over the data which transposes the input matrix and we are sure that there are no overlapping dimensions. --sebastian > > On Sat, Nov 12, 2011 at 2:48 AM, Lance Norskog <[email protected]> wrote: >> org.apache.mahout.math.hadoop.similarity.cooccurrence.Vectors.merge(Iterable<VectorWritable>) >> >> This ORs together several (sparse) VectorWritables. It does not sum >> together overlapping dimensions, it just overwrites them from the most >> final vector in the list. Is this ok? Should they be summed? >> >> -- >> Lance Norskog >> [email protected] >>
