Consider a many body classical system, for simplicity let's assume it's some gas with pairwise interaction between particles. I would like to build a Tensor Network for the system. However the particles become **off-lattice** in the moment the simulation starts (assuming each particle occupied a lattice site at $t=0$).

1. Is there a way to build an off-lattice Tensor Network representation of a system or it's only applied for a system which is constrained to a lattice?

2. What's the difference between Tensor Network and regular Graph Theory approach to represent systems?