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 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
