org.apache.ignite.ml.preprocessing.normalization

Class NormalizationPreprocessor<K,V>

java.lang.Object

org.apache.ignite.ml.preprocessing.normalization.NormalizationPreprocessor<K,V>

Type Parameters:

K - Type of a key in upstream data.

V - Type of a value in upstream data.

All Implemented Interfaces:

Serializable, BiFunction<K,V,double[]>, IgniteBiFunction<K,V,double[]>

public class NormalizationPreprocessor<K,V>
extends Object
implements IgniteBiFunction<K,V,double[]>

Preprocessing function that makes normalization. From mathematical point of view it's the following function which is applied to every element in dataset: a_i = (a_i - min_i) / (max_i - min_i) for all i, where i is a number of column, max_i is the value of the maximum element in this columns, min_i is the value of the minimal element in this column.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
NormalizationPreprocessor(double[] min, double[] max, IgniteBiFunction<K,V,double[]> basePreprocessor) Constructs a new instance of normalization preprocessor.

Method Summary

Modifier and Type	Method and Description
double[]	apply(K k, V v) Applies this preprocessor.
double[]	getMax()
double[]	getMin()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.ignite.ml.math.functions.IgniteBiFunction

andThen

Methods inherited from interface java.util.function.BiFunction

andThen

Constructor Detail

NormalizationPreprocessor

public NormalizationPreprocessor(double[] min,
                                 double[] max,
                                 IgniteBiFunction<K,V,double[]> basePreprocessor)

Constructs a new instance of normalization preprocessor.

Parameters:

min - Minimal values.

max - Maximum values.

basePreprocessor - Base preprocessor.

Method Detail

apply

public double[] apply(K k,
                      V v)

Applies this preprocessor.

Specified by:

apply in interface BiFunction<K,V,double[]>

Parameters:

k - Key.

v - Value.

Returns:

Preprocessed row.

getMin

public double[] getMin()

getMax

public double[] getMax()