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https://issues.apache.org/jira/browse/DATAFU-60?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14057023#comment-14057023
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Joshua Hartman commented on DATAFU-60:
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Please see https://reviews.apache.org/r/23384/ for the review board
> Support NDCG calculation within a UDF
> -------------------------------------
>
> Key: DATAFU-60
> URL: https://issues.apache.org/jira/browse/DATAFU-60
> Project: DataFu
> Issue Type: New Feature
> Reporter: Joshua Hartman
> Labels: features
> Attachments: DATAFU-60.patch
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> Ndcg is a common evaluation metric for the quality of a list of items
> presented to a user. It is an especially common metric used in the search
> literature.
> This feature request is to implement a udf to calculate ndcg.
> NDCG can be calculated using any function to represent the value of a
> position. Several useful functions should be available as part of the datafu
> library. First is the standard 1/logarithmic discounting factor. Another
> option should be the ability to supply a custom positional value for any
> range of positions in the case that a positional "value" is already well
> understood. However, the actual discounting function used should be easily
> pluggable in the event something custom is needed
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