Update src/basicfuns.jl

Co-authored-by: David Widmann <[email protected]>

src/basicfuns.jl

@@ -262,19 +262,11 @@ Return `log(exp(x) - 1)` or the “invsoftplus” function.  It is the inverse o
 logexpm1(x::Real) = x <= 18.0 ? log(_expm1(x)) : x <= 33.3 ? x - exp(-x) : oftype(exp(-x), x)
 logexpm1(x::Float32) = x <= 9f0 ? log(expm1(x)) : x <= 16f0 ? x - exp(-x) : oftype(exp(-x), x)
 
-function softplus(x; a::Real=1.0)
-    if a == 1.0
-        return log1pexp(x)
-    end
-    return log1pexp(a * x) / a
-end
+softplus(x::Real) = log1pexp(x)
+softplus(x::Real, a::Real) = log1pexp(a * x) / a
 
-function invsoftplus(y; a::Real=1.0)
-    if a == 1.0
-        return logexpm1(y)
-    end
-    return logexpm1(a * y) / a
-end
+invsoftplus(y::Real) = logexpm1(y)
+invsoftplus(y::Real, a::Real) = logexpm1(a * y) / a
 
 
 """