remove explicit type (not a fix)

Author: YichengDWu

src/rules.jl

@@ -166,9 +166,8 @@ function apply!(o::Rprop, state, x, dx)
     ℓ, Γ = o.ell, o.gamma
     g, η = state
 
-    T = eltype(dx)
     g, η = broadcast(g, η, dx) do g, η, dx
-        g * dx > 0 ? (g, min(η * ℓ[2], Γ[2])) : g * dx < 0 ? (zero(T), max(η * ℓ[1], Γ[1])) : (g, η)
+        g * dx > 0 ? (g, min(η * ℓ[2], Γ[2])) : g * dx < 0 ? (zero(dx), max(η * ℓ[1], Γ[1])) : (g, η)
     end
 
     dx′ = @lazy η * sign(g)

test/rules.jl

@@ -39,7 +39,7 @@ end
     @test iloss(rand(10, 10), w, w′) > 1
     st = Optimisers.setup(o, w)
     for t = 1:10^5
-      x = rand(10,20)
+      x = rand(10, 20)
       gs = loggradient(o)(w -> iloss(x, w, w′), w)
       st, w = Optimisers.update!(st, w, gs...)
     end