Remove adjoints of Euclidean and SqEuclidean

Author: devmotion

src/zygote_adjoints.jl

@@ -1,20 +1,3 @@
-@adjoint function evaluate(s::SqEuclidean, x::AbstractVector, y::AbstractVector)
-  δ = x .- y
-  sum(abs2, δ), Δ -> begin
-    x̄ = (2 * Δ) .* δ
-    (nothing, x̄, -x̄)
-  end
-end
-
-@adjoint function evaluate(s::Euclidean, x::AbstractVector, y::AbstractVector)
-  D = x.-y
-  δ = sqrt(sum(abs2,D))
-  δ, Δ -> begin
-    x̄ = Δ .* D / (δ + eps(δ))
-    (nothing, x̄, -x̄)
-  end
-end
-
 @adjoint function evaluate(s::DotProduct, x::AbstractVector, y::AbstractVector)
   dot(x,y), Δ -> begin
     (nothing, Δ.*y, Δ.*x)