Hi, I have a question with regards to text vs mm. Isn't the mm coordinate format identical to the text format but the mm data file happens to include the metadata line for rows, cols, and nnzs, so shouldn't they scale the same since the text row values (i,j,v) correspond to the mm rows?
If we have the following MM: %%MatrixMarket matrix coordinate real general 4 3 6 1 1 1.0 1 2 2.0 1 3 3.0 3 1 7.0 3 2 8.0 3 3 9.0 The corresponding text format (with accompanying metadata file) is: 1 1 1.0 1 2 2.0 1 3 3.0 3 1 7.0 3 2 8.0 3 3 9.0 So aren't these formats essentially the same? Deron On Mon, Feb 15, 2016 at 3:56 PM, Matthias Boehm <mbo...@us.ibm.com> wrote: > The meta data file is still useful in order to get the format. In case of > matrix market, errors will be raised if included meta data is inconsistent. > So no, we should not disallow to specify the meta data. In general, we > anyway recommend using text (textcell) instead mm (matrix market) for > scalability reasons. > > Regards, > Matthias > > [image: Inactive hide details for Deron Eriksson ---02/15/2016 03:45:46 > PM---Hi, The Matrix Market coordinate format contains # rows, #]Deron > Eriksson ---02/15/2016 03:45:46 PM---Hi, The Matrix Market coordinate > format contains # rows, # columns, and # > > From: Deron Eriksson <deroneriks...@gmail.com> > To: dev@systemml.incubator.apache.org > Date: 02/15/2016 03:45 PM > Subject: Matrix Market format with metadata file > ------------------------------ > > > > Hi, > > The Matrix Market coordinate format contains # rows, # columns, and # > non-zero values as metadata near the top of a matrix data file. > > If I write a matrix in mm format using SystemML, no metadata file is > created since the metadata is stored within the data file. > > However, when reading a matrix with mm format, I can supply a metadata > file, even though metadata exists in the matrix data file. Is there any > reason for this, or should this be disallowed since the metadata file is > redundant and can cause confusion, since metadata values can then be > specified in two places, which then brings up the question, "which metadata > value should be used"? > > Deron > > >
