Matthew Hayes closed DATAFU-60.
    Resolution: Won't Do

Closing this as it is quite old and there have been no updates.

> 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
>            Priority: Major
>              Labels: features
>         Attachments: DATAFU-60-v2.patch, 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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