You would only need to compute the unique set of and up and down determinants and their gradients and Laplacians. Then you can recombine everything to get the total wave function. This his how we obtain in QMC=Chem a scaling for near-FCI wave functions. You can have a look at this presentation: http://irpf90.ups-tlse.fr/files/pacifichem.pdf or this paper: https://arxiv.org/abs/1510.00730 we can also have a zoom to if you want more detail :-)
(https://github.com/NLESC-JCER/QMCTorch/issues/145#issuecomment-1709690764) Suggestion by Anthony Scemama
You would only need to compute the unique set of and up and down determinants and their gradients and Laplacians. Then you can recombine everything to get the total wave function. This his how we obtain in QMC=Chem a scaling for near-FCI wave functions. You can have a look at this presentation: http://irpf90.ups-tlse.fr/files/pacifichem.pdf or this paper: https://arxiv.org/abs/1510.00730 we can also have a zoom to if you want more detail :-)