[v1.0.0] - 2024-03-19

Release Notes

This is the first officially stable release of TeNPy. Compared to the v0.99 release, it only introduces necessary backwards-incompatible changes and removes deprecated features.

Especially when upgrading from an older version, or in case you get an error with code that used to work, we suggest that you install v0.99 before upgrading to v1.0 or greater. You can for example do that in a separate conda environment:

conda create -n tenpy_099 -c conda-forge physics-tenpy=0.99

This allows you to fix any FutureWarning that your code raises. If it doesn’t raise any FutureWarning, your code shouldn’t be affected by the incompatible changes below.

Changelog

Backwards incompatible changes

  • Change the default to sort_charge=True in the config of models and in the __init__ of sites. This may cause issues when loading data that was saved using an older version of tenpy. See also issue #175.

  • Drop support for scipy<0.18, in particular in svd_robust

  • Drop support for legacy simulation_class_name option in console_main, i.e. when calling tenpy-run in a command line and in simulation.py

  • Drop support for outer products in the sequence of ncon().

  • Call signature changes (mostly removing legacy keyword arguments):

    • Model.add_multi_coupling() : remove legacy positional arguments

    • MPS.expectation_value_terms_sum() : remove legacy prefactors argument

    • mps.TransferMatrix() : Change default of shift_ket to 0

    • Array.combine_legs() : Change default of qconj

    • KrylovBased(), LanczosGroundState(), lanczos(), lanczos_arpack() : remove legacy orthogonal_to arg

    • lanczos.gram_schmidt() : remove legacy verbose arg

    • np_conserved.inner() : change default of axes to labels

    • MPS.permute_sites() : remove legacy verbose arg

    • tools.misc.setup_logging() : remove legacy options positional argument

  • Remove deprecated / legacy submodules:

    • models.bose_hubbard and models.bose_hubbard_chain

    • models.fermions_hubbard and models.fermion_chain

    • algorithms.purification_tebd

    • mps_sweeps

  • Remove deprecated / legacy config entries:

    • CouplingModel : bc_coupling

    • truncation : symmetry_tol

    • Sweep : LP, LP_age, RP, RP_age, init_env_data, orthogonal_to, sweep_0

    • Simulation : logging_params

    • VariationalCompression : N_sweeps

  • Remove deprecated / legacy attributes:

    • Lattice.nearest_neighbors, etc.

    • DMRGEngine.DMRG_params, Sweep.engine_params, TDVPEngine.TDVP_params, TEBDEngine.TEBD_params

    • Array.labels

    • Algorithm.verbose, CouplingModel.verbose, Simulation.verbose, Config.verbose

  • Remove deprecated / legacy methods:

    • MPO.get_grouped_mpo()

    • MPO.get_full_hamiltonian()

    • MPS.increase_L()

    • MPS.canonical_form_infinite()

    • CouplingModel.calc_H_onsite()

    • FlatLinearOperator.flat_to_npc_all_sectors and FlatLinearOperator.npc_to_flat_all_sectors

  • Remove deprecated / legacy functions:

    • tools.misc.chi_list()

    • tools.misc.setup_executable()

    • tools.misc.build_initial()

    • tools.misc.any_nonzero()

    • tools.params.get_parameter()

    • tools.params.unused_parameters()

    • sites.multi_sites_combine_charges()

    • legacy functions in simulations.measurements

  • Remove deprecated / legacy classes:

    • dmrg.SingleSiteMixer, drmg.TwoSiteMixer

    • dmrg.EngineCombine, dmrg.EngineFracture

    • tdvp.Engine, tdvp.OldTDVPEngine

    • tebd.Engine

    • model.MultiCoupingModel

Changed

  • Remove FutureWarning:

    • When using legacy features, e.g. config parameters

    • When adding Arrays causes a transpose to match labels