GitHub user yueguoguo opened a pull request:
https://github.com/apache/spark/pull/22147
Fixed NDCG formula and link
## What changes were proposed in this pull request?
(Please fill in changes proposed in this fix)
## How was this patch tested?
(Please explain how this patch was tested. E.g. unit tests, integration
tests, manual tests)
(If this patch involves UI changes, please attach a screenshot; otherwise,
remove this)
Please review http://spark.apache.org/contributing.html before opening a
pull request.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yueguoguo/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22147.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #22147
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commit 3d9cf5f8eea5d4144b7bbb49ad12e32a5a150a52
Author: Zhang Le <yueguoguo@...>
Date: 2018-08-13T08:33:20Z
[DOCS] Fixed error in MAP formula
Average precision is calculated by number_of_hits_in_j_items / j, instead
of one_hit / j.
commit 1cb2a163a2ee07103ea3304f23b9c4b142e94ce8
Author: Zhang Le <yueguoguo@...>
Date: 2018-08-20T03:03:32Z
[DOCS] Changed to ln(j+2); updated wiki link
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