Minor changes towards GPU compatibility (#236)

* return lazy Fill arrays for mean functions from #197

* replace Diagonal(Fill(...)) with PDMats.ScalMat

* add tr_Cf_invΣy method for ScalMat & tests

* _cholesky for ScalMat

* update Manifests

* _symmetric(X::AbstractPDMat) = X

Author: st--

Project.toml

@@ -1,7 +1,7 @@
 name = "AbstractGPs"
 uuid = "99985d1d-32ba-4be9-9821-2ec096f28918"
 authors = ["JuliaGaussianProcesses Team"]
-version = "0.5.9"
+version = "0.5.10"
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
@@ -10,6 +10,7 @@ FillArrays = "1a297f60-69ca-5386-bcde-b61e274b549b"
 IrrationalConstants = "92d709cd-6900-40b7-9082-c6be49f344b6"
 KernelFunctions = "ec8451be-7e33-11e9-00cf-bbf324bd1392"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+PDMats = "90014a1f-27ba-587c-ab20-58faa44d9150"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 RecipesBase = "3cdcf5f2-1ef4-517c-9805-6587b60abb01"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
@@ -23,6 +24,7 @@ Distributions = "0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25"
 FillArrays = "0.7, 0.8, 0.9, 0.10, 0.11, 0.12, 0.13"
 IrrationalConstants = "0.1"
 KernelFunctions = "0.9, 0.10"
+PDMats = "0.11"
 RecipesBase = "1"
 Reexport = "0.2, 1"
 StatsBase = "0.33"