v1.11.0

Breaking Changes

• move belief propagation to quimb.tensor.belief_propagation
• calling tn.contract() when an non-zero value has been accrued into tn.exponent now automatically re-absorbs that exponent.
• binary tensor operations that would previously have errored now will align and broadcast

Enhancements:

• Tensor: make binary operations (+, -, *, /, **) automatically align and broadcast indices. This would previously error.
• MatrixProductState.measure: add a seed kwarg
• belief propagation, implement DIIS (direct inversion in the iterative subspace)
• belief propagation, unify various aspects such as message normalization and distance.
• belief propagation, add a plot method.
• belief propagation, add a contract_every option.
• HV1BP: vectorize both contraction and message initialization
• add qu.plot_multi_series_zoom for plotting multiple series with a zoomed inset, useful for various convergence plots such as BP
• add info option to tn.gauge_all_simple for tracking extra information such as number of iterations and max gauge diffs
• Tensor.gate: add transposed option
• TensorNetwork.contract: add strip_exponent option for return the mantissa and exponent (log10) separately. Compatible with contract_tags, contract_cumulative, contract_compressed sub modes.
• tensor_split: add matrix_svals option, if True any returned singular values are put into the diagonal of a matrix (by default, False, they are returned as a vector).
• add Tensor.new_ind_pair_diag for expanding an existing index into a pair of new indices, such that the diagonal of the new tensor on those indices is the old tensor.
• TNOptimizer: add 'cautious' ADAM
• TensorNetwork.pop_tensor: allow tid or tags to be specified.
• add an example notebook for converting hyper tensor networks to normal tensor networks, for approximate contraction - https://quimb.readthedocs.io/en/latest/examples/ex_htn_to_tn_2d.html#example-htn-to-2d
• Add SX and SXDG gates by @kevinsung in #277
• Add XXPLUSYY and XXMINUSYY gates by @kevinsung in #279
• Added progbar to qsim, and openqasm2 by @edenian in #288
• quimb.experimental.operatorbuilder: fix MPO building for congested operators (#296 and #301), allow arbitrary dtype (#289). Fix building of sparse and matrix representations for non-translationally symmetric operators and operators with trivial (all identity) terms.

Bug fixes:

• fix MatrixProductState.measure for cupy backend arrays (#276).
• fix linalg.expm dispatch (#275)
• fix 'dm' 1d compress method for disconnected subgraphs
• fix docs source lookup in quimb.tensor module
• fix raw gate copying in Circuit (#285)

New Contributors

• @edenian made their first contribution in #288

Full Changelog: v1.10.0...v1.11.0