Package com.jml.neural_network.activations

Class Sigmoid

java.lang.Object

com.jml.neural_network.activations.Sigmoid

All Implemented Interfaces:

ActivationFunction

public class Sigmoid
extends Object
implements ActivationFunction

The sigmoid activation function. f(x) = 1/(1+exp(-x))

Field Summary

Fields

Modifier and Type	Field	Description
String	NAME

Constructor Summary

Constructors

Constructor	Description
Sigmoid()

Method Summary

Modifier and Type	Method	Description
linalg.Matrix	back(linalg.Matrix data)	Applies the derivative of the sigmoid activation function element-wise to a matrix.
linalg.Matrix	forward(linalg.Matrix data)	Applies the sigmoid activation element-wise to a matrix.
String	getName()	Gets the name of the activation function.

Methods inherited from class java.lang.Object

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

Field Details

NAME

public final String NAME

See Also:

Constant Field Values

Constructor Details

Sigmoid

public Sigmoid()

Method Details

forward

public linalg.Matrix forward(linalg.Matrix data)

Applies the sigmoid activation element-wise to a matrix.

Specified by:

forward in interface ActivationFunction

Parameters:

data - Matrix to apply sigmoid activation to.

Returns:

The result of the sigmoid activation applied element-wise to the data matrix.

back

public linalg.Matrix back(linalg.Matrix data)

Applies the derivative of the sigmoid activation function element-wise to a matrix.

Specified by:

back in interface ActivationFunction

Parameters:

data - Matrix to apply the derivative of the sigmoid activation function to.

Returns:

The result of the derivative of the sigmoid activation applied element-wise to the data.

getName

public String getName()

Gets the name of the activation function.

Specified by:

getName in interface ActivationFunction

Returns:

The name of the activation function as a String.