Package org.apache.spark.mllib.linalg

Class SparseVector

Object

org.apache.spark.mllib.linalg.SparseVector

All Implemented Interfaces:

Serializable, Vector

public class SparseVector
extends Object
implements Vector

A sparse vector represented by an index array and a value array.

param: size size of the vector. param: indices index array, assume to be strictly increasing. param: values value array, must have the same length as the index array.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
SparseVector(int size, int[] indices, double[] values)

Method Summary

Modifier and Type	Method	Description
double	apply(int i)	Gets the value of the ith element.
int	argmax()	Find the index of a maximal element.
SparseVector	asML()	Convert this vector to the new mllib-local representation.
SparseVector	copy()	Makes a deep copy of this vector.
boolean	equals(Object other)
static SparseVector	fromML(SparseVector v)	Convert new linalg type to spark.mllib type.
int	hashCode()	Returns a hash code value for the vector.
int[]	indices()
int	numActives()	Number of active entries.
int	numNonzeros()	Number of nonzero elements.
int	size()	Size of the vector.
double[]	toArray()	Converts the instance to a double array.
String	toJson()	Converts the vector to a JSON string.
String	toString()
static scala.Option<scala.Tuple3<Object,int[],double[]>>	unapply(SparseVector sv)
double[]	values()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.spark.mllib.linalg.Vector

compressed, dot, foreach, foreachActive, foreachNonZero, nonZeroIterator, sparsity, toDense, toSparse

Constructor Details

SparseVector

public SparseVector(int size,
 int[] indices,
 double[] values)

Method Details

unapply

public static scala.Option<scala.Tuple3<Object,int[],double[]>> unapply(SparseVector sv)

fromML

public static SparseVector fromML(SparseVector v)

Convert new linalg type to spark.mllib type. Light copy; only copies references

Parameters:

v - (undocumented)

Returns:

(undocumented)

size

public int size()

Description copied from interface: Vector

Size of the vector.

Specified by:

size in interface Vector

Returns:

(undocumented)

indices

public int[] indices()

values

public double[] values()

toString

public String toString()

Overrides:

toString in class Object

toArray

public double[] toArray()

Description copied from interface: Vector

Converts the instance to a double array.

Specified by:

toArray in interface Vector

Returns:

(undocumented)

copy

public SparseVector copy()

Description copied from interface: Vector

Makes a deep copy of this vector.

Specified by:

copy in interface Vector

Returns:

(undocumented)

apply

public double apply(int i)

Description copied from interface: Vector

Gets the value of the ith element.

Specified by:

apply in interface Vector

Parameters:

i - index

Returns:

(undocumented)

equals

public boolean equals(Object other)

Specified by:

equals in interface Vector

Overrides:

equals in class Object

hashCode

public int hashCode()

Description copied from interface: Vector

Returns a hash code value for the vector. The hash code is based on its size and its first 128 nonzero entries, using a hash algorithm similar to java.util.Arrays.hashCode.

Specified by:

hashCode in interface Vector

Overrides:

hashCode in class Object

Returns:

(undocumented)

numActives

public int numActives()

Description copied from interface: Vector

Number of active entries. An "active entry" is an element which is explicitly stored, regardless of its value.

Specified by:

numActives in interface Vector

Returns:

(undocumented)

numNonzeros

public int numNonzeros()

Description copied from interface: Vector

Number of nonzero elements. This scans all active values and count nonzeros.

Specified by:

numNonzeros in interface Vector

Returns:

(undocumented)

argmax

public int argmax()

Description copied from interface: Vector

Find the index of a maximal element. Returns the first maximal element in case of a tie. Returns -1 if vector has length 0.

Specified by:

argmax in interface Vector

Returns:

(undocumented)

toJson

public String toJson()

Description copied from interface: Vector

Converts the vector to a JSON string.

Specified by:

toJson in interface Vector

Returns:

(undocumented)

asML

public SparseVector asML()

Description copied from interface: Vector

Convert this vector to the new mllib-local representation. This does NOT copy the data; it copies references.

Specified by:

asML in interface Vector

Returns:

(undocumented)