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org.apache.lens.ml.spark
Class ColumnFeatureFunction

java.lang.Object
  org.apache.lens.ml.spark.FeatureFunction
      org.apache.lens.ml.spark.ColumnFeatureFunction

All Implemented Interfaces:

Serializable, org.apache.spark.api.java.function.Function<scala.Tuple2<org.apache.hadoop.io.WritableComparable,org.apache.hive.hcatalog.data.HCatRecord>,org.apache.spark.mllib.regression.LabeledPoint>

public class ColumnFeatureFunction
extends FeatureFunction

A feature function that directly maps an HCatRecord to a feature vector. Each column becomes a feature in the vector, with the value of the feature obtained using the value mapper for that column

See Also:

Serialized Form

Field Summary

static org.apache.log4j.Logger

LOG The Constant LOG.

Constructor Summary

ColumnFeatureFunction(int[] featurePositions, FeatureValueMapper[] valueMappers, int labelColumnPos, int numFeatures, double defaultLabel)
Feature positions and value mappers are parallel arrays.

Method Summary

org.apache.spark.mllib.regression.LabeledPoint

call(scala.Tuple2<org.apache.hadoop.io.WritableComparable,org.apache.hive.hcatalog.data.HCatRecord> tuple)

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.apache.log4j.Logger LOG

The Constant LOG.

Constructor Detail

ColumnFeatureFunction

public ColumnFeatureFunction(int[] featurePositions,
                             FeatureValueMapper[] valueMappers,
                             int labelColumnPos,
                             int numFeatures,
                             double defaultLabel)

Feature positions and value mappers are parallel arrays. featurePositions[i] gives the position of ith feature in the HCatRecord, and valueMappers[i] gives the value mapper used to map that feature to a Double value

Parameters:

featurePositions - position number of feature column in the HCatRecord

valueMappers - mapper for each column position

labelColumnPos - position of the label column

numFeatures - number of features in the feature vector

defaultLabel - default lable to be used for null records

Method Detail

call

public org.apache.spark.mllib.regression.LabeledPoint call(scala.Tuple2<org.apache.hadoop.io.WritableComparable,org.apache.hive.hcatalog.data.HCatRecord> tuple)
                                                    throws Exception

Specified by:

call in interface org.apache.spark.api.java.function.Function<scala.Tuple2<org.apache.hadoop.io.WritableComparable,org.apache.hive.hcatalog.data.HCatRecord>,org.apache.spark.mllib.regression.LabeledPoint>

Specified by:

call in class FeatureFunction

Throws:

Exception