Copied style of Flux for params

Author: theogf

src/generic.jl

@@ -14,6 +14,22 @@ _scale(t::ScaleTransform, metric, x, y) = evaluate(metric, apply(t, x), apply(t,
 printshifted(io::IO,κ::Kernel,shift::Int) = print(io,"$κ")
 Base.show(io::IO,κ::Kernel) = print(io,nameof(typeof(κ)))
 
+function params(k::Kernel)
+    ps = []
+    params!(ps,k)
+    return ps
+end
+
+function params!(ps,k::Kernel)
+    for child in trainable(k)
+        params!(ps,k)
+    end
+end
+
+params!(ps,x::AbstractArray) = push!(ps,x)
+
+trainable(x) = ()
+
 ### Syntactic sugar for creating matrices and using kernel functions
 for k in subtypes(BaseKernel)
     @eval begin

src/utils.jl

@@ -38,4 +38,4 @@ base_transform(t::Transform) = eval(nameof(typeof(t)))
 For a kernel return a tuple with parameters of the transform followed by the specific parameters of the kernel
 For a transform return its parameters, for a `ChainTransform` return a vector of `params(t)`.
 """
-params(k::Kernel) = (params(transform(k)),)
+params