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Let $h(0),h(1),\dots,h(k)$ be a symmetric concave sequence. For a$(d,k)$-biregular factor graph $G$ and $x\in \{0,1\}^V$, we define theHamiltonian \[H_G(x)=\sum_{f\in F} h\left(\sum_{v\in \partial f} x_v\right),\]where $V$ is the set of variable nodes, $F$ is the set of factor nodes. Weprove that if $(G_n)$ is a large girth sequence of $(d,k)$-biregular factorgraphs, then the free energy density of $G_n$ converges. The limiting freeenergy density is given by the Bethe-approximation.

On the free energy density of factor models on biregular graphs