Fann Functions
PHP Manual

fann_set_activation_function

Sets the activation function for supplied neuron and layer

Description

bool fann_set_activation_function(
    resource $ann,
    int $activation_function,
    int $layer,
    int $neuron
)

Set the activation function for neuron number neuron in layer number layer, counting the input layer as layer 0.

It is not possible to set activation functions for the neurons in the input layer.

When choosing an activation function it is important to note that the activation functions have different range. FANN_SIGMOID is e.g. in the 0 - 1 range while FANN_SIGMOID_SYMMETRIC is in the -1 - 1 range and FANN_LINEAR is unbound.

The supplied activation_function value must be one of the activation functions constants.

The return value is one of the activation functions constants.

Parameters

ann

Neural network resource.

activation_function

The activation functions constant.

layer

Layer number.

neuron

Neuron number.

Return Values

Returns true on success, or false otherwise.

See Also

  • fann_set_activation_function_layer
  • fann_set_activation_function_hidden
  • fann_set_activation_function_output
  • fann_set_activation_steepness
  • fann_get_activation_function