org.apache.flink.ml.common.linalg

类 VectorUtil

java.lang.Object

org.apache.flink.ml.common.linalg.VectorUtil

public class VectorUtil
extends Object

Utility class for the operations on Vector and its subclasses.

构造器概要

构造器

构造器和说明
VectorUtil()

方法概要

限定符和类型	方法和说明
static Vector	parse(String str) Parse either a SparseVector or a DenseVector from a formatted string.
static DenseVector	parseDense(String str) Parse the dense vector from a formatted string.
static SparseVector	parseSparse(String str) Parse the sparse vector from a formatted string.
static String	toString(DenseVector denseVector) Serialize the DenseVector to String.
static String	toString(SparseVector sparseVector) Serialize the SparseVector to string.
static String	toString(Vector vector) Serialize the vector to a string.

从类继承的方法 java.lang.Object

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

构造器详细资料

VectorUtil

public VectorUtil()

方法详细资料

parse

public static Vector parse(String str)

Parse either a SparseVector or a DenseVector from a formatted string.

The format of a dense vector is space separated values such as "1 2 3 4". The format of a sparse vector is space separated index-value pairs, such as "0:1 2:3 3:4". If the sparse vector has determined vector size, the size is prepended to the head. For example, the string "$4$0:1 2:3 3:4" represents a sparse vector with size 4.

参数:

str - A formatted string representing a vector.

返回:

The parsed vector.

parseDense

public static DenseVector parseDense(String str)

Parse the dense vector from a formatted string.

The format of a dense vector is space separated values such as "1 2 3 4".

参数:

str - A string of space separated values.

返回:

The parsed vector.

parseSparse

public static SparseVector parseSparse(String str)

Parse the sparse vector from a formatted string.

The format of a sparse vector is space separated index-value pairs, such as "0:1 2:3 3:4". If the sparse vector has determined vector size, the size is prepended to the head. For example, the string "$4$0:1 2:3 3:4" represents a sparse vector with size 4.

参数:

str - A formatted string representing a sparse vector.

抛出:

IllegalArgumentException - If the string is of invalid format.

toString

public static String toString(Vector vector)

Serialize the vector to a string.

参数:

vector - The vector to serialize.

另请参阅:

toString(DenseVector), toString(SparseVector)

toString

public static String toString(SparseVector sparseVector)

Serialize the SparseVector to string.

The format of the returned is described at parseSparse(String)

参数:

sparseVector - The sparse vector to serialize.

toString

public static String toString(DenseVector denseVector)

Serialize the DenseVector to String.

The format of the returned is described at parseDense(String)

参数:

denseVector - The DenseVector to serialize.