fix move benchmark model to main file

Author: Red-Portal

bench/benchmarks.jl

@@ -16,7 +16,34 @@ BLAS.set_num_threads(min(4, Threads.nthreads()))
 @info sprint(versioninfo)
 @info "BLAS threads: $(BLAS.get_num_threads())"
 
-include("unconstrdist.jl")
+struct Dist{D<:ContinuousMultivariateDistribution}
+    dist::D
+end
+
+function LogDensityProblems.logdensity(model::Dist, x)
+    return logpdf(model.dist, x)
+end
+
+function LogDensityProblems.logdensity_and_gradient(model::Dist, θ)
+    return (
+        LogDensityProblems.logdensity(model, θ),
+        ForwardDiff.gradient(Base.Fix1(LogDensityProblems.logdensity, model), θ),
+    )
+end
+
+function LogDensityProblems.dimension(model::Dist)
+    return length(model.dist)
+end
+
+function LogDensityProblems.capabilities(::Type{<:Dist})
+    return LogDensityProblems.LogDensityOrder{0}()
+end
+
+function normal(; n_dims=10, realtype=Float64)
+    μ = fill(realtype(5), n_dims)
+    Σ = Diagonal(ones(realtype, n_dims))
+    return Dist(MvNormal(μ, Σ))
+end
 
 const SUITES = BenchmarkGroup()