shahidki31 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_r249249172
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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:
Actually the Q will vary with i, that is why I gave the notation |R_i|.
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