This Python tool allows you to draw signal-flow graphs, calculate transfer functions (SymPy code is generated for further use in Jupyter notebooks), do graph manipulations (e.g., node elimination and graph transposition), and save a graph as TikZ for use in LaTeX documentation.
Let the TikZ generator write out LaTeX code by using the function sp.latex() on weights and node names.
We don't make it optional, I think. Comments?