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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2020/09/25 03:00:56 UTC
[GitHub] [spark] zhengruifeng commented on pull request #29868: [SPARK-32973][ML][DOC] FeatureHasher does not check categoricalCols in inputCols
zhengruifeng commented on pull request #29868:
URL: https://github.com/apache/spark/pull/29868#issuecomment-698693191
repl:
```
import org.apache.spark.ml.feature._
import org.apache.spark.ml.linalg.{Vector, Vectors}
val df = Seq((2.0, 1, "foo"),(3.0, 2, "bar")).toDF("real", "int", "string")
val n = 100
val hasher = new FeatureHasher().setInputCols("int", "string").setCategoricalCols(Array("real")).setOutputCol("features").setNumFeatures(n)
hasher.transform(df).show
```
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