Php/docs/function.fann-set-activation-function-hidden
From Get docs
(PECL fann >= 1.0.0)
fann_set_activation_function_hidden — Sets the activation function for all of the hidden layers
fann_set_activation_function_hidden
( resource $ann
, int $activation_function
) : bool
Sets the activation function for all of the hidden layers.
Returns TRUE
on success, or FALSE
otherwise.