Fig. 5: Graphical representation of methods for handling large local bases.
From: Tensor networks for lattice gauge theories beyond one dimension
a The pseudo site DMRG (PS-DMRG) approach, in which a single site having large local dimension d is replaced with nps pseudo sites with a smaller local dimension, e.g., two; b the local basis optimization embedded in the MPS ansatz (LBO-MPS), so that an additional layer of tensors connected to the physical legs of the MPS performs the reduction from a large local basis with dimension d into an effective basis with smaller dimension \({d}^{{\prime} }\); χ is the bond dimension of the MPS.
