[SYSTEMDS-2058] Incorrect results on sparse-dense, sparse-unsafe unary operations

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: SystemML 1.1
• Assignee: Matthias Boehm
• Reporter: Matthias Boehm
• Created: 05/Jan/18 01:35
• Updated: 16/Jan/18 22:34
• Resolved: 16/Jan/18 22:34

Description

The generalization of NOT to matrices revealed a hidden issue of incorrect results for sparse-dense unary operations. This happens in case of sparse-unsafe operations that produce a zero for each existing non-zero value because this zeros are rejected by the used append functionality.