[SYSTEMDS-2688] Diag V2M operations w/ shallow data copy

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: SystemDS 2.1
• Component/s: Runtime
• Assignee: Matthias Boehm
• Reporter: Matthias Boehm
• Created: 19/Oct/20 11:03
• Updated: 19/Oct/20 11:22
• Resolved: 19/Oct/20 11:22

Description

For diag V2M we already output the sparse result in a space-efficient CSR representation. However, for the special case of input vectors v with nrow(v)==nnz(v), we could use a shallow copy of the data array as the CSR values array is equivalent.