srowen commented on a change in pull request #23589: [SPARK-26351][mllib]Update
doc and minor correction in the mllib evaluation metrics
URL: https://github.com/apache/spark/pull/23589#discussion_r249247842
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File path: docs/mllib-evaluation-metrics.md
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@@ -439,21 +439,21 @@ $$rel_D(r) = \begin{cases}1 & \text{if $r \in D$}, \\ 0
& \text{otherwise}.\end{
Precision at k
</td>
<td>
- $p(k)=\frac{1}{M} \sum_{i=0}^{M-1} {\frac{1}{k}
\sum_{j=0}^{\text{min}(\left|D\right|, k) - 1} rel_{D_i}(R_i(j))}$
+ $p(k)=\frac{1}{M} \sum_{i=0}^{M-1} {\frac{1}{k}
\sum_{j=0}^{\text{min}(\left|R_i\right|, k) - 1} rel_{D_i}(R_i(j))}$
Review comment:
Although we usually have k <= |D| and k <= |R_i|, I agree that this is
technically what must have been meant. How about using Q here instead of |R_i|?
it was already used in the following formula. You can change both, sure, either
way, as long as they're consistent.
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