Bugfix in VarInfo. (#516)

* Bugfix in `VarInfo`.

* Update Project.toml

* Update src/varinfo.jl

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Update src/varinfo.jl

Co-authored-by: David Widmann <devmotion@users.noreply.github.com>

* Added tests.

* Apply suggestions from code review

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Fix for tests in #516 (#517)

* fixed tests for linking of dirichlet with different dimensionality

* added usage of same logp in TestUtils.setup_varinfos

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: David Widmann <devmotion@users.noreply.github.com>
Co-authored-by: Tor Erlend Fjelde <tor.erlend95@gmail.com>

Project.toml

@@ -1,6 +1,6 @@
 name = "DynamicPPL"
 uuid = "366bfd00-2699-11ea-058f-f148b4cae6d8"
-version = "0.23.12"
+version = "0.23.13"
 
 [deps]
 AbstractMCMC = "80f14c24-f653-4e6a-9b94-39d6b0f70001"

src/test_utils.jl

@@ -51,9 +51,10 @@ function setup_varinfos(model::Model, example_values::NamedTuple, varnames)
     svi_typed = SimpleVarInfo(example_values)
     svi_untyped = SimpleVarInfo(OrderedDict())
 
+    lp = getlogp(vi_typed)
     return map((vi_untyped, vi_typed, svi_typed, svi_untyped)) do vi
         # Set them all to the same values.
-        update_values!!(vi, example_values, varnames)
+        DynamicPPL.setlogp!!(update_values!!(vi, example_values, varnames), lp)
     end
 end
 

src/varinfo.jl

@@ -366,7 +366,7 @@ setall!(vi::TypedVarInfo, val) = _setall!(vi.metadata, val)
     for f in names
         length = :(sum(length, metadata.$f.ranges))
         finish = :($start + $length - 1)
-        push!(expr.args, :(metadata.$f.vals .= val[($start):($finish)]))
+        push!(expr.args, :(copyto!(metadata.$f.vals, 1, val, $start, $length)))
         start = :($start + $length)
     end
     return expr

test/linking.jl

@@ -91,21 +91,26 @@ end
         end
     end
 
+    # Related: https://github.com/TuringLang/DynamicPPL.jl/issues/504
     @testset "dirichlet" begin
-        @model demo_dirichlet() = x ~ Dirichlet(2, 1.0)
-        model = demo_dirichlet()
-        vis = DynamicPPL.TestUtils.setup_varinfos(model, rand(model), (@varname(x),))
-        @testset "$(short_varinfo_name(vi))" for vi in vis
-            @test length(vi[:]) == 2
-            @test iszero(getlogp(vi))
-            # Linked.
-            vi_linked = DynamicPPL.link!!(deepcopy(vi), model)
-            @test length(vi_linked[:]) == 1
-            @test !iszero(getlogp(vi_linked)) # should now include the log-absdet-jacobian correction
-            # Invlinked.
-            vi_invlinked = DynamicPPL.invlink!!(deepcopy(vi_linked), model)
-            @test length(vi_invlinked[:]) == 2
-            @test iszero(getlogp(vi_invlinked))
+        @model demo_dirichlet(d::Int) = x ~ Dirichlet(d, 1.0)
+        @testset "d=$d" for d in [2, 3, 5]
+            model = demo_dirichlet(d)
+            vis = DynamicPPL.TestUtils.setup_varinfos(model, rand(model), (@varname(x),))
+            @testset "$(short_varinfo_name(vi))" for vi in vis
+                lp = logpdf(Dirichlet(d, 1.0), vi[:])
+                @test length(vi[:]) == d
+                @test getlogp(vi) ≈ lp
+                # Linked.
+                vi_linked = DynamicPPL.link!!(deepcopy(vi), model)
+                @test length(vi_linked[:]) == d - 1
+                # Should now include the log-absdet-jacobian correction.
+                @test !(getlogp(vi_linked) ≈ lp)
+                # Invlinked.
+                vi_invlinked = DynamicPPL.invlink!!(deepcopy(vi_linked), model)
+                @test length(vi_invlinked[:]) == d
+                @test getlogp(vi_invlinked) ≈ lp
+            end
         end
     end
 end