Nothing
linear.prime <-
function(x)
{
x*0 + 1
}
linear <-
function(x)
{
x
}
elu.prime <-
function(x, alpha=1)
{
ifelse(x >= 0, 1, elu(x, alpha) + alpha)
}
elu <-
function(x, alpha=1)
{
ifelse(x >= 0, x, alpha*(exp(x)-1))
}
sigmoid.prime <-
function(x)
{
(0.5)*(1-tanh(0.5*x)^2)
}
sigmoid <-
function(x)
{
tanh(0.5*x)
}
softplus.prime <-
function(x, alpha=2)
{
y <- exp(alpha*x)/(1+exp(alpha*x))
ifelse(is.nan(y), 1, y)
}
softplus <-
function(x, alpha=2)
{
y <- log(1+exp(alpha*x))/alpha
ifelse(is.infinite(y), x, y)
}
relu.prime <- function(x){
ifelse(x >= 0, 1, 0)
}
relu <- function(x){
ifelse(x >= 0, x, 0)
}
logistic.prime <- function(x){
0.25/(cosh(x/2)^2)
}
logistic <- function(x){
0.5 + 0.5*tanh(x/2)
}
lrelu.prime <- function(x){
ifelse(x >= 0, 1, 0.01)
}
lrelu <- function(x){
ifelse(x >= 0, x, 0.01*x)
}
softmax <- function(x){
exp(x)/sum(exp(x))
}
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