[SPARK-10353] MLlib BLAS gemm outputs wrong result when beta = 0.0 for transpose transpose matrix multiplication

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.1, 1.4.1, 1.5.0
• Fix Version/s: 1.3.2, 1.4.2, 1.5.0
• Component/s: MLlib
• Assignee: Burak Yavuz
• Reporter: Burak Yavuz
• Created: 30/Aug/15 05:30
• Updated: 02/Sep/15 20:34
• Resolved: 02/Sep/15 20:33

Description

Basically

if (beta != 0.0) {
  f2jBLAS.dscal(C.values.length, beta, C.values, 1)
}

should be

if (beta != 1.0) {
  f2jBLAS.dscal(C.values.length, beta, C.values, 1)
}

Issue Links

• links to: [Github] Pull Request #8525 (brkyvz)
• links to: [Github] Pull Request #8572 (srowen)