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	concat(Vector... vs) Concatenates given vectors.
static Vector	concat(Vector v1, Vector... vs) Concatenates given vectors.
static Vector	concat(Vector v1, Vector v2) Concatenates two given vectors.
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 DenseVector	fill(double val, int n) Create new vector of specified size n with specified value.
static IgniteFunction<Vector,Vector>	getProjector(int[] mapping) Get projector from index mapping.
static double[]	num2Arr(double val) Turn number to 1-sized array.
static Vector	num2Vec(double val) Wrap specified value into vector.
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 NamedVector	of(Map<String,Double> values) Creates named vector based on map of keys and values.
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

fill

public static DenseVector fill(double val,
                               int n)

Create new vector of specified size n with specified value.

Parameters:

val - Value.

n - Size;

Returns:

New vector of specified size n with specified value.

num2Vec

public static Vector num2Vec(double val)

Wrap specified value into vector.

Parameters:

val - Value to wrap.

Returns:

Specified value wrapped into vector.

num2Arr

public static double[] num2Arr(double val)

Turn number to 1-sized array.

Parameters:

val - Value to wrap in array.

Returns:

Number wrapped in 1-sized array.

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.

of

public static NamedVector of(Map<String,Double> values)

Creates named vector based on map of keys and values.

Parameters:

values - Values.

Returns:

Named vector.

concat

public static Vector concat(Vector v1,
                            Vector v2)

Concatenates two given vectors.

Parameters:

v1 - First vector.

v2 - Second vector.

Returns:

Concatenation result.

concat

public static Vector concat(Vector v1,
                            Vector... vs)

Concatenates given vectors.

Parameters:

v1 - First vector.

vs - Other vectors.

Returns:

Concatenation result.

concat

public static Vector concat(Vector... vs)

Concatenates given vectors.

Parameters:

vs - Other vectors.

Returns:

Concatenation result.

getProjector

public static IgniteFunction<Vector,Vector> getProjector(int[] mapping)

Get projector from index mapping.

Parameters:

mapping - Index mapping.

Returns:

Projector.