org.apache.spark.ml.feature

Class OneHotEncoderCommon

Object

org.apache.spark.ml.feature.OneHotEncoderCommon

public class OneHotEncoderCommon
extends Object

Provides some helper methods used by OneHotEncoder.

Constructor Summary

Constructors

Constructor and Description
OneHotEncoderCommon()

Method Summary

Modifier and Type	Method and Description
static AttributeGroup	createAttrGroupForAttrNames(String outputColName, int numAttrs, boolean dropLast, boolean keepInvalid) Creates an `AttributeGroup` with the required number of `BinaryAttribute`.
static scala.collection.Seq<AttributeGroup>	getOutputAttrGroupFromData(Dataset<?> dataset, scala.collection.Seq<String> inputColNames, scala.collection.Seq<String> outputColNames, boolean dropLast) This method is called when we want to generate AttributeGroup from actual data for one-hot encoder.
static StructField	transformOutputColumnSchema(StructField inputCol, String outputColName, boolean dropLast, boolean keepInvalid) Prepares the StructField with proper metadata for OneHotEncoder's output column.

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OneHotEncoderCommon

public OneHotEncoderCommon()

Method Detail

transformOutputColumnSchema

public static StructField transformOutputColumnSchema(StructField inputCol,
                                                      String outputColName,
                                                      boolean dropLast,
                                                      boolean keepInvalid)

Prepares the StructField with proper metadata for OneHotEncoder's output column.

Parameters:

inputCol - (undocumented)

outputColName - (undocumented)

dropLast - (undocumented)

keepInvalid - (undocumented)

Returns:

(undocumented)

getOutputAttrGroupFromData

public static scala.collection.Seq<AttributeGroup> getOutputAttrGroupFromData(Dataset<?> dataset,
                                                                              scala.collection.Seq<String> inputColNames,
                                                                              scala.collection.Seq<String> outputColNames,
                                                                              boolean dropLast)

This method is called when we want to generate AttributeGroup from actual data for one-hot encoder.

Parameters:

dataset - (undocumented)

inputColNames - (undocumented)

outputColNames - (undocumented)

dropLast - (undocumented)

Returns:

(undocumented)

createAttrGroupForAttrNames

public static AttributeGroup createAttrGroupForAttrNames(String outputColName,
                                                         int numAttrs,
                                                         boolean dropLast,
                                                         boolean keepInvalid)

Creates an `AttributeGroup` with the required number of `BinaryAttribute`.