feat: add plev, TensorTrain, tensor contraction, diag utilities#29
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feat: add plev, TensorTrain, tensor contraction, diag utilities#29
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Add plev across the Julia wrapper: - C_API.jl: t4a_index_get_plev, t4a_index_set_plev, t4a_index_prime wrappers - Tensor4all.jl: plev(), prime(), noprime(), setprime() functions - Updated ==, hash, sim, show to include plev - commoninds/uniqueinds/replaceinds/hasind/hasinds now plev-aware - ITensors extension preserves plev in both conversion directions - Tests for all plev functionality Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- TensorTrain = TreeTensorNetwork{Int} (same type as MPS/MPO)
- is_chain(ttn): runtime check for chain topology
- Int variant: verifies vertices are 1:n with sequential connectivity
- Generic variant: checks path graph properties (degree ≤ 2, connected)
- _assert_chain(ttn): throws ArgumentError for non-chain topology
- Tests: 121/121 TreeTN tests pass
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- contract(t1::Tensor, t2::Tensor): tensor-tensor contraction via C API - t1 * t2 operator for tensors - is_mps_like(tt): check each vertex has 1 site index - is_mpo_like(tt): check each vertex has 2 site indices - diag_embed(t, idx): duplicate idx as primed copy (MPS→MPO-like) - diag_trace(t, idx, idx'): extract diagonal (MPO→MPS-like) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Update TENSOR4ALL_RS_FALLBACK_COMMIT to latest main which includes plev support and t4a_tensor_contract C API. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
TensorTraintype alias +is_chain/_assert_chainruntime checkscontract(t1::Tensor, t2::Tensor)+*operatoris_mps_like/is_mpo_likeruntime checkersdiag_embed/diag_tracefor MPS-like ↔ MPO-like tensor manipulationDepends on: tensor4all/tensor4all-rs#398 (plev + tensor contraction C API)
Changes
Prime level support
plev(i),prime(i),noprime(i),setprime(i, n)functions==,hash,siminclude plevcommoninds,uniqueinds,replaceinds,hasind,hasindsare plev-awareTensorTrain alias
TensorTrain = TreeTensorNetwork{Int}(same type as MPS/MPO)is_chain(ttn): runtime check for chain topology_assert_chain(ttn): throws for non-chainTensor contraction
contract(t1::Tensor, t2::Tensor): viat4a_tensor_contractC APIt1 * t2operatorUtility functions
is_mps_like(tt): each vertex has 1 site indexis_mpo_like(tt): each vertex has 2 site indicesdiag_embed(t, idx): duplicate idx as primed copy (diagonal)diag_trace(t, idx, idx'): extract diagonalTest plan
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