In order to use pypfilt you will need to define the following things:
A simulation model that describes the behaviour of the system;
See Creating your own model for an example of defining a simulation model.
Prior distribution(s) and parameter bounds;
Some observations of the system (either real or simulated from the simulation model);
An observation model that describes how the simulation model and the observations are related;
Simulation and particle filter settings, such as:
Particle filter settings, such as the resampling threshold and whether to use post-regularisation;
Select appropriate summary tables to record things of interest; and
A seed for the pseudo-random number generator, so that the results are reproducible.
TOML is a simple, easy to read configuration file format, similar to JSON and YAML.