dcg ( scores -- dcg ) (original) (raw)
dcg ( scores -- dcg )
Statistics
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Vocabulary
math.statistics
Inputs
| scores | a sequence |
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Outputs
| dcg | a number |
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Word description
Calculates the discounted cumulative gain from a list of scores. The discounted cumulative gain can be used to compare two lists of results against each other given scores for each of the results.
See https://en.wikipedia.org/wiki/Discounted_cumulative_gain
See also
ndcg
Definition
USING: kernel math math.functions math.vectors ranges sequences
;
: dcg ( scores -- dcg )
dup length 1 + 2 swap [a..b] [ log 2 log /f ] map v/ sum ;