While still under construction, [flexOPT](https://github.com/seismobassoon/flexOPT) can now handle many data formats (including your drawing) to compute seismic wave propagation, neutrino propgation (more to come, I hope). During this 8th edition of hackathon, I was concentrated on the optimisation of compact operator coefficients construction with the aid of GPU. Unlike equation 42 of [Fuji and Duretz (2025, still unpublished](https://arxiv.org/abs/2505.02320), Thibault and I wanted to propose to use mixture of Taylor expansions from all the points in time and space concerned, which rapidly increases the number of for-loop... Thanks to Ludo and Ivan, I was able to make that motor work. But since I do not have still sexy figures, here I just show the whatsoever model that you can litterally draw by yourself.
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