[SYSTEMDS-2408] Invalid empty input handling on fused mmchain XtXvy w/ minus

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: SystemML 1.2
• Epic Link: Cleanup and modernize ARIMA scripts
• Assignee: Matthias Boehm
• Reporter: Matthias Boehm
• Created: 19/Jun/18 06:34
• Updated: 26/Jun/18 03:44
• Resolved: 26/Jun/18 03:44

Description

We compile a single fused mmchain operator of type XtXvy but this implementation did not properly handle empty right hand side vectors (here combined_weights) in case of minus.

residuals = local_X %*% combined_weights - X[,1]
res_A = t(local_X) %*% residuals