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https://issues.apache.org/jira/browse/SPARK-32973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhengruifeng updated SPARK-32973:
---------------------------------
Description:
doc related to {{categoricalCols}}:
{code:java}
Numeric columns to treat as categorical features. By default only string and
boolean columns are treated as categorical, so this param can be used to
explicitly specify the numerical columns to treat as categorical. Note, the
relevant columns must also be set in inputCols. {code}
However, the check to make sure {{categoricalCols}} in {{inputCols}} was never
implemented:
for example, in 2.4.7 and current master(3.1.0):
{code:java}
scala> import org.apache.spark.ml.feature._
import org.apache.spark.ml.feature._
scala> import org.apache.spark.ml.linalg.{Vector, Vectors}
import org.apache.spark.ml.linalg.{Vector, Vectors}
scala> val df = Seq((2.0, 1, "foo"),(3.0, 2, "bar")).toDF("real", "int",
"string")
df: org.apache.spark.sql.DataFrame = [real: double, int: int ... 1 more field]
scala> val n = 100
n: Int = 100
scala> val hasher = new FeatureHasher().setInputCols("int",
"string").setCategoricalCols(Array("real")).setOutputCol("features").setNumFeatures(n)
hasher: org.apache.spark.ml.feature.FeatureHasher = featureHasher_fbe05968b33f
scala> hasher.transform(df).show
+----+---+------+--------------------+
|real|int|string| features|
+----+---+------+--------------------+
| 2.0| 1| foo|(100,[2,39],[1.0,...|
| 3.0| 2| bar|(100,[2,42],[2.0,...|
+----+---+------+--------------------+
{code}
CategoricalCols "real" is not in inputCols ("int", "string").
I think there are two options:
1, remove this comment "Note, the relevant columns must also be set in
inputCols. ", since this check seems un
was:
doc related to {{categoricalCols}}:
{code:java}
Numeric columns to treat as categorical features. By default only string and
boolean columns are treated as categorical, so this param can be used to
explicitly specify the numerical columns to treat as categorical. Note, the
relevant columns must also be set in inputCols. {code}
However, the check to make sure
> FeatureHasher does not check categoricalCols in inputCols
> ---------------------------------------------------------
>
> Key: SPARK-32973
> URL: https://issues.apache.org/jira/browse/SPARK-32973
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 2.3.0, 2.4.0, 3.0.0, 3.1.0
> Reporter: zhengruifeng
> Priority: Trivial
>
> doc related to {{categoricalCols}}:
> {code:java}
> Numeric columns to treat as categorical features. By default only string and
> boolean columns are treated as categorical, so this param can be used to
> explicitly specify the numerical columns to treat as categorical. Note, the
> relevant columns must also be set in inputCols. {code}
>
> However, the check to make sure {{categoricalCols}} in {{inputCols}} was
> never implemented:
> for example, in 2.4.7 and current master(3.1.0):
> {code:java}
> scala> import org.apache.spark.ml.feature._
> import org.apache.spark.ml.feature._
> scala> import org.apache.spark.ml.linalg.{Vector, Vectors}
> import org.apache.spark.ml.linalg.{Vector, Vectors}
> scala> val df = Seq((2.0, 1, "foo"),(3.0, 2, "bar")).toDF("real", "int",
> "string")
> df: org.apache.spark.sql.DataFrame = [real: double, int: int ... 1 more field]
> scala> val n = 100
> n: Int = 100
> scala> val hasher = new FeatureHasher().setInputCols("int",
> "string").setCategoricalCols(Array("real")).setOutputCol("features").setNumFeatures(n)
>
> hasher: org.apache.spark.ml.feature.FeatureHasher = featureHasher_fbe05968b33f
> scala> hasher.transform(df).show
> +----+---+------+--------------------+
> |real|int|string| features|
> +----+---+------+--------------------+
> | 2.0| 1| foo|(100,[2,39],[1.0,...|
> | 3.0| 2| bar|(100,[2,42],[2.0,...|
> +----+---+------+--------------------+
> {code}
>
> CategoricalCols "real" is not in inputCols ("int", "string").
>
> I think there are two options:
> 1, remove this comment "Note, the relevant columns must also be set in
> inputCols. ", since this check seems un
>
>
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