[MAHOUT-772] Refactor Matrix/Vector implementation with linear operators

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.5
• Fix Version/s: 0.10.0
• Component/s: classic
• Assignee: Unassigned
• Reporter: Jonathan Traupman
• Created: 25/Jul/11 06:13
• Updated: 31/Jan/24 22:16
• Resolved: 02/Mar/14 20:00

Description

As part of the implementation of MAHOUT-672, we refactored the various linear algebra classes to include a new superclass for matrices, the LinearOperator, which is more or less a matrix that implements various arithmetic operations but does not allow per-element or per-row/col access. Linear operators allowed us to implement things like diagonal offsets (e.g. ridge regression) and the "timesSquared" operation efficiently and generally, removing some special-case code in various algorithms.

Since in its current state, this refactor isn't ready for inclusion, and because it's fairly separate for other stuff in MAHOUT-672, I'm pulling it out into its own issue.

Issue Links

• is related to: MAHOUT-672 Implementation of Conjugate Gradient for solving large linear systems