[MAHOUT-1753] First and second moment routines

• Type: Blog - New Blog Request
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.10.2
• Epic Link: Samsara-algorithms
• Sprint: Jul-2015
• Assignee: Dmitriy Lyubimov
• Reporter: Dmitriy Lyubimov
• Created: 24/Jun/15 17:17
• Updated: 07/Aug/15 15:56
• Resolved: 17/Jul/15 00:34

Description

R analogs: mean(), rowCols(), rowMeans(), variance(), sd().

Since it presents an efficiency problem to compute second and first moment as two different routines, this issue suggest to unify computation of both first and second moments in the same routine.

For completeness, we do both in-core and distriuted variations, by convention prepending distributed versions with "d" letter:

colMeanVars()
colMeanStdevs()
dcolMeanVars()
dcolMeanStdevs()