Update softmax.jl (#569)

Author: mcabbott

src/softmax.jl

@@ -62,7 +62,8 @@ function softmax!(out::AbstractArray{T}, x::AbstractArray; dims = 1) where {T}
     if all(isfinite, max_)
         @fastmath out .= exp.(x .- max_)
     else
-        @fastmath @. out = ifelse(isequal(max_,Inf), ifelse(isequal(x,Inf), 1, 0), exp(x - max_))
+        _zero, _one, _inf = T(0), T(1), T(Inf)
+        @fastmath @. out = ifelse(isequal(max_,_inf), ifelse(isequal(x,_inf), _one, _zero), exp(x - max_))
     end
     tmp = dims isa Colon ? sum(out) : sum!(max_, out)
     out ./= tmp