[SYSTEMDS-2034] Performance issue sparse-dense maxpooling backward

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: SystemML 1.0.0
• Epic Link: Perftest and QA for SystemML 1.0 release
• Assignee: Matthias Boehm
• Reporter: Matthias Boehm
• Created: 01/Dec/17 08:22
• Updated: 02/Dec/17 23:04
• Resolved: 02/Dec/17 23:04

Description

The current implementation of sparse-dense maxpooling_backward uses for every p-q combination a full scan over the sparse row just to find the applicable range. We should instead flip this dense implementation to a "real" sparse implementation that scans the sparse input just once.