org.apache.ignite.ml.math.primitives.vector

Class VectorUtils

java.lang.Object

org.apache.ignite.ml.math.primitives.vector.VectorUtils

public class VectorUtils
extends Object

Some utils for Vector.

Constructor Summary

Constructors

Constructor and Description
VectorUtils()

Method Summary

Modifier and Type	Method and Description
static Vector	copyPart(Vector v, int off, int len) Get copy of part of given length of given vector starting from given offset.
static Vector	elementWiseMinus(Vector vec1, Vector vec2) Performs in-place vector subtraction.
static Vector	elementWiseTimes(Vector vec1, Vector vec2) Performs in-place vector multiplication.
static Vector	num2Vec(int num, int vecSize) Turn number into a local Vector of given size with one-hot encoding.
static Vector	num2Vec(int num, int vecSize, boolean isDistributed) Turn number into Vector of given size with one-hot encoding.
static Vector	of(double... values) Creates dense local on heap vector based on array of doubles.
static Vector	of(Double[] values) Creates vector based on array of Doubles.
static double	vec2Num(Vector vec) Turn Vector into number by looking at index of maximal element in vector.
static DenseVector	zeroes(int n) Create new
static Vector	zeroesLike(Vector v) Create new vector like given vector initialized by zeroes.
static Vector	zipWith(Vector v1, Vector v2, IgniteBiFunction<Double,Double,Double> f) Zip two vectors with given binary function (i.e. apply binary function to both vector elementwise and construct vector from results).

Methods inherited from class java.lang.Object

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

Constructor Detail

VectorUtils

public VectorUtils()

Method Detail

zeroesLike

public static Vector zeroesLike(Vector v)

Create new vector like given vector initialized by zeroes.

zeroes

public static DenseVector zeroes(int n)

Create new

num2Vec

public static Vector num2Vec(int num,
                             int vecSize)

Turn number into a local Vector of given size with one-hot encoding.

Parameters:

num - Number to turn into vector.

vecSize - Vector size of output vector.

Returns:

One-hot encoded number.

num2Vec

public static Vector num2Vec(int num,
                             int vecSize,
                             boolean isDistributed)

Turn number into Vector of given size with one-hot encoding.

Parameters:

num - Number to turn into vector.

vecSize - Vector size of output vector.

isDistributed - Flag indicating if distributed vector should be created.

Returns:

One-hot encoded number.

vec2Num

public static double vec2Num(Vector vec)

Turn Vector into number by looking at index of maximal element in vector.

Parameters:

vec - Vector to be turned into number.

Returns:

Number.

elementWiseTimes

public static Vector elementWiseTimes(Vector vec1,
                                      Vector vec2)

Performs in-place vector multiplication.

Parameters:

vec1 - Operand to be changed and first multiplication operand.

vec2 - Second multiplication operand.

Returns:

Updated first operand.

elementWiseMinus

public static Vector elementWiseMinus(Vector vec1,
                                      Vector vec2)

Performs in-place vector subtraction.

Parameters:

vec1 - Operand to be changed and subtracted from.

vec2 - Operand to subtract.

Returns:

Updated first operand.

zipWith

public static Vector zipWith(Vector v1,
                             Vector v2,
                             IgniteBiFunction<Double,Double,Double> f)

Zip two vectors with given binary function (i.e. apply binary function to both vector elementwise and construct vector from results). Example zipWith({0, 2, 4}, {1, 3, 5}, plus) = {0 + 1, 2 + 3, 4 + 5}. Length of result is length of shortest of vectors.

Parameters:

v1 - First vector.

v2 - Second vector.

f - Function to zip with.

Returns:

Result of zipping.

copyPart

public static Vector copyPart(Vector v,
                              int off,
                              int len)

Get copy of part of given length of given vector starting from given offset.

Parameters:

v - Vector to copy part from.

off - Offset.

len - Length.

Returns:

Copy of part of given length of given vector starting from given offset.

of

public static Vector of(double... values)

Creates dense local on heap vector based on array of doubles.

Parameters:

values - Values.

of

public static Vector of(Double[] values)

Creates vector based on array of Doubles. If array contains null-elements then method returns sparse local on head vector. In other case method returns dense local on heap vector.

Parameters:

values - Values.