[GitHub] [spark] zhengruifeng commented on pull request #29868: [SPARK-32973][ML][DOC] FeatureHasher does not check categoricalCols in inputCols

Thu, 24 Sep 2020 20:01:09 -0700 


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
   ```
   
   
   
![image](https://user-images.githubusercontent.com/7322292/94221773-5b0e7f80-ff1e-11ea-98d8-e7a2f030c93b.png)
   


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