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# Convert named activation functions in R functions, including derivatives
convert.activation.function <- function(fun) {
if (fun == "tanh") {
fct <- function(x) {
tanh(x)
}
attr(fct, "type") <- "tanh"
deriv.fct <- function(x) {
1 - x^2
}
} else if (fun == "logistic") {
fct <- function(x) {
1/(1 + exp(-x))
}
attr(fct, "type") <- "logistic"
deriv.fct <- function(x) {
x * (1 - x)
}
} else {
stop("Unknown function.", call. = FALSE)
}
list(fct = fct, deriv.fct = deriv.fct)
}
# Convert named error functions in R functions, including derivatives
convert.error.function <- function(fun) {
if (fun == "sse") {
fct <- function(x, y) {
1/2 * (y - x)^2
}
attr(fct, "type") <- "sse"
deriv.fct <- function(x, y) {
x - y
}
} else if (fun == "ce") {
fct <- function(x, y) {
-(y * log(x) + (1 - y) * log(1 - x))
}
attr(fct, "type") <- "ce"
deriv.fct <- function(x, y) {
(1 - y)/(1 - x) - y/x
}
} else {
stop("Unknown function.", call. = FALSE)
}
list(fct = fct, deriv.fct = deriv.fct)
}
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