[MADLIB-1181] Add an option for weighted average in k-NN

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: v1.14
• Component/s: k-NN
• Assignee: Himanshu Pandey
• Reporter: Frank McQuillan
• Created: 21/Nov/17 01:03
• Updated: 15/Feb/18 00:25
• Resolved: 13/Feb/18 23:20

Description

Follow on from
https://issues.apache.org/jira/browse/MADLIB-1059
(please see this JIRA for additional comments)

MADlib does a simple average of the k-nearest neighbors to come up with the
final value for classification and regression. Doing a weighted average instead
might be a desirable functionality. The weighting for the average can be based on the
distance of the k-nearest neighbors.

We can probably provide an optional parameter to let users choose how the final
score has to be computed (avg or weighted avg).

This JIRA applies to classification and regression.

Issue Links

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