diff --git a/src/MatrixProductBP.jl b/src/MatrixProductBP.jl
index 1f93f5c1..ea91ba53 100644
--- a/src/MatrixProductBP.jl
+++ b/src/MatrixProductBP.jl
@@ -49,7 +49,7 @@ export
     pair_observations_nondirected, pair_obs_undirected_to_directed,
     exact_prob, exact_marginals, site_marginals, exact_autocorrelations,
     exact_autocovariances, exact_marginal_expectations, 
-    uniform_exact_msg, mpbp_exact,
+    uniform_exact_msg, mpbp_exact, exact_mpbp_infinite_graph,
     SoftMarginSampler, onesample!, onesample, sample!, sample, marginals, pair_marginals,
     continuous_sis_sampler, simulate_queue_sis!,
     draw_node_observations!, AtomicVector,
diff --git a/src/exact.jl b/src/exact.jl
index 506c8e25..71196228 100644
--- a/src/exact.jl
+++ b/src/exact.jl
@@ -281,4 +281,19 @@ function marginals(m::ExactMsg)
     end
 end
 
-is_periodic(bp::MPBP{G,F,V,<:ExactMsg{P},<:ExactMsg{P}}) where {G,F,V,P} = P
\ No newline at end of file
+is_periodic(bp::MPBP{G,F,V,<:ExactMsg{P},<:ExactMsg{P}}) where {G,F,V,P} = P
+
+function exact_mpbp_infinite_graph(k::Integer, wᵢ::Vector{U}, qi::Int,
+    ϕᵢ = fill(ones(qi), length(wᵢ));
+    ψₖᵢ = fill(ones(qi, qi), length(wᵢ)),
+    periodic = false) where {U<:BPFactor}
+
+    T = length(wᵢ) - 1
+    @assert length(ϕᵢ) == T + 1
+    @assert length(ψₖᵢ) == T + 1
+    
+    g = InfiniteRegularGraph(k)
+    μ = uniform_exact_msg((qi, qi), T; periodic)
+    b = uniform_exact_msg((qi,), T; periodic)
+    MPBP(g, [wᵢ], [ϕᵢ], [ψₖᵢ], [μ], [b], [0.0])
+end
\ No newline at end of file