Class ArrayMath

Namespace

NOpenNLP.Tools.Ml

Assembly

NOpenNLP.Tools.dll

Utility class for simple vector arithmetic.

public static class ArrayMath

Inheritance

object

ArrayMath

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Methods

Argmax(double[])

Find index of maximum element in the vector x

public static int Argmax(double[] x)

Parameters

x double[]

input vector

Returns

int

index of the maximum element. Index of the first maximum element is returned if multiple maximums are found.

InnerProduct(double[], double[])

public static double InnerProduct(double[] vecA, double[] vecB)

Parameters

vecA double[]

vecB double[]

Returns

double

InvL2norm(double[])

Inverse L2-norm

public static double InvL2norm(double[] v)

Parameters

v double[]

Returns

double

L1norm(double[])

L1-norm

public static double L1norm(double[] v)

Parameters

v double[]

Returns

double

L2norm(double[])

L2-norm

public static double L2norm(double[] v)

Parameters

v double[]

Returns

double

LogSumOfExps(double[])

Computes \log(\sum_{i=1}^n e^{x_i}) using a maximum-element trick to avoid arithmetic overflow.

public static double LogSumOfExps(double[] x)

Parameters

x double[]

input vector

Returns

double

log-sum of exponentials of vector elements

Max(double[])

public static double Max(double[] x)

Parameters

x double[]

Returns

double

SumFeatures(Context?[], float[]?, double[])

public static void SumFeatures(Context?[] context, float[]? values, double[] prior)

Parameters

context Context[]

values float[]

prior double[]

ToDoubleArray(IList<double>)

Convert a list of Double objects into an array of primitive doubles

public static double[] ToDoubleArray(IList<double> list)

Parameters

list IList<double>

Returns

double[]

ToIntArray(IList<int>)

Convert a list of Integer objects into an array of primitive integers

public static int[] ToIntArray(IList<int> list)

Parameters

list IList<int>

Returns

int[]