A few style fixes (#183)

Author: willtebbutt

src/kernels/kernelproduct.jl

@@ -44,8 +44,8 @@ end
 Base.:*(k1::Kernel,k2::Kernel) = KernelProduct(k1, k2)
 
 function Base.:*(
-    k1::KernelProduct{<:AbstractVector{<:Kernel}}, 
-    k2::KernelProduct{<:AbstractVector{<:Kernel}}
+    k1::KernelProduct{<:AbstractVector{<:Kernel}},
+    k2::KernelProduct{<:AbstractVector{<:Kernel}},
 )
     return KernelProduct(vcat(k1.kernels, k2.kernels))
 end

src/kernels/kernelsum.jl

@@ -44,10 +44,9 @@ end
 Base.:+(k1::Kernel, k2::Kernel) = KernelSum(k1, k2)
 
 function Base.:+(
-    k1::KernelSum{<:AbstractVector{<:Kernel}}, 
-    k2::KernelSum{<:AbstractVector{<:Kernel}}
+    k1::KernelSum{<:AbstractVector{<:Kernel}}, k2::KernelSum{<:AbstractVector{<:Kernel}},
 )
-    KernelSum(vcat(k1.kernels, k2.kernels))
+    return KernelSum(vcat(k1.kernels, k2.kernels))
 end
 
 Base.:+(k1::KernelSum, k2::KernelSum) = KernelSum(k1.kernels..., k2.kernels...)

src/kernels/scaledkernel.jl

@@ -30,10 +30,7 @@ function kerneldiagmatrix(κ::ScaledKernel, x::AbstractVector)
 end
 
 function kernelmatrix!(
-    K::AbstractMatrix,
-    κ::ScaledKernel,
-    x::AbstractVector,
-    y::AbstractVector,
+    K::AbstractMatrix, κ::ScaledKernel, x::AbstractVector, y::AbstractVector,
 )
     kernelmatrix!(K, κ, x, y)
     K .*= κ.σ² 

src/kernels/tensorproduct.jl

@@ -56,10 +56,7 @@ function kernelmatrix!(K::AbstractMatrix, k::TensorProduct, x::AbstractVector)
 end
 
 function kernelmatrix!(
-    K::AbstractMatrix,
-    k::TensorProduct,
-    x::AbstractVector,
-    y::AbstractVector,
+    K::AbstractMatrix, k::TensorProduct, x::AbstractVector, y::AbstractVector,
 )
     validate_inplace_dims(K, x, y)
     validate_domain(k, x)

src/kernels/transformedkernel.jl

@@ -73,10 +73,7 @@ function kernelmatrix!(K::AbstractMatrix, κ::TransformedKernel, x::AbstractVect
 end
 
 function kernelmatrix!(
-    K::AbstractMatrix,
-    κ::TransformedKernel,
-    x::AbstractVector,
-    y::AbstractVector,
+    K::AbstractMatrix, κ::TransformedKernel, x::AbstractVector, y::AbstractVector,
 )
     return kernelmatrix!(K, kernel(κ), _map(κ.transform, x), _map(κ.transform, y))
 end