Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/15212#discussion_r93766701
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/ChiSqSelector.scala ---
@@ -111,11 +139,17 @@ private[feature] trait ChiSqSelectorParams extends
Params
/**
* Chi-Squared feature selection, which selects categorical features to
use for predicting a
* categorical label.
- * The selector supports different selection methods: `numTopFeatures`,
`percentile`, `fpr`.
+ * The selector supports different selection methods: `numTopFeatures`,
`percentile`, `fpr`,
+ * `fdr`, `fwe`.
* - `numTopFeatures` chooses a fixed number of top features according to
a chi-squared test.
* - `percentile` is similar but chooses a fraction of all features
instead of a fixed number.
* - `fpr` chooses all features whose p-value is below a threshold, thus
controlling the false
* positive rate of selection.
+ * - `fdr` uses the [Benjamini-Hochberg procedure]
+ *
(https://en.wikipedia.org/wiki/False_discovery_rate#Benjamini.E2.80.93Hochberg_procedure)
+ * to choose all features whose false discovery rate is below a
threshold.
+ * - `fwe` chooses all features whose whose p-values is below a threshold,
--- End diff --
Remove duplicated ```whose```.
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