logloss

2017-04-28 17:14:27 +01:00 · 2017-04-28 17:14:27 +01:00 · 360d128b1a
commit 360d128b1a
parent ef4ec5be4b
1 changed files with 4 additions and 0 deletions
--- a/src/cost.jl
+++ b/src/cost.jl
@ -3,3 +3,7 @@ export mse, mse!
 mse(ŷ, y) = sumabs2(ŷ .- y)/2

 back!(::typeof(mse), Δ, ŷ, y) = Δ*(ŷ .- y)
+
+logloss(ŷ, y) = -sum(y .* log.(ŷ))
+
+back!(::typeof(logloss), Δ, ŷ, y) = 0 .- Δ .* y ./ ŷ