ITensor/ITensorNetworks.jl

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A package with general tools for working with higher-dimensional tensor networks based on ITensor.

Stars: 128
Forks: 23
Open beginner issues: 0
Indexed issues: 49
Avg merge: 4d 7h
Merged PRs (30d): 7

Dominant language: Julia
License: Apache-2.0
Last GitHub push: Sep 9, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

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49 open issues indexed

[ENHANCEMENT] Make `expect` vertices input consistent Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

ITensor/ITensorNetworks.jl#306 · Opened Mar 8, 2026
Allow `using ITensorNetworks: add!` Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

ITensor/ITensorNetworks.jl#210 · Opened Oct 28, 2024
Create an iterator interface for `alternating_update` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#200 · 1 comment · Opened Sep 18, 2024
Automatic determination of tree tensor network structures Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ITensor/ITensorNetworks.jl#188 · 1 comment · 2 reactions · Opened Jun 6, 2024
Pass reduced operator/problem and initial reduced state as arguments to solver updaters Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

ITensor/ITensorNetworks.jl#182 · Opened May 16, 2024
Implement n-point correlators Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#181 · 4 comments · Opened May 15, 2024
Simplify bra, operator, and ket vertex logic of form networks with partitioned graphs Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#180 · 1 comment · Opened May 15, 2024
Use `PartitionedGraph` in `contract_approx` Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

ITensor/ITensorNetworks.jl#179 · 1 reaction · Opened May 15, 2024
Pass common keyword arguments to local updaters in a NamedTuple `internal_kwargs` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#177 · 4 comments · Opened May 13, 2024
Rename `region_observer!` to `observer!` Open

Difficulty 1/5 Under an hour Newbie friendliness 72/100

ITensor/ITensorNetworks.jl#176 · Opened May 13, 2024
Delete `flatten_networks` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#164 · 1 comment · Opened Apr 26, 2024
Filling missing keyword arguments for sweeps Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#150 · 1 reaction · Opened Apr 1, 2024
Generalize `ProjOuterProdTTN` to general products of TTNs Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#135 · Opened Feb 2, 2024
Verify consistency of implementation of `ProjOuterProdTTN` with `ProjTTN` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#134 · Opened Feb 2, 2024
Simplify `projected_operator_tensors` by using `post_order_dfs_vertices` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#133 · Opened Feb 1, 2024
More functionality for `PartitionedGraph` wrapping `ITensorNetwork` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#127 · Opened Jan 22, 2024
`random_ttn` for site-indices with `QN`s Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

ITensor/ITensorNetworks.jl#124 · 2 comments · Opened Jan 14, 2024
Improvements in `OpSum` to `TTN` conversion Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

ITensor/ITensorNetworks.jl#117 · 2 comments · 1 reaction · Opened Jan 9, 2024
Wish list for `alternating_update` Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

ITensor/ITensorNetworks.jl#115 · 1 reaction · Opened Nov 8, 2023
Wish list for `belief_propagation` Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ITensor/ITensorNetworks.jl#112 · Opened Oct 23, 2023
Swap the vertex naming convention of `inner_network` Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

ITensor/ITensorNetworks.jl#108 · Opened Jul 30, 2023
Early stopping of square root BP Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#105 · Opened Jul 17, 2023
Confusing `ITensor(::ITensorNetwork)` behavior Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#98 · 5 comments · Opened Jul 6, 2023
Improvements to `make_region` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#90 · 1 comment · Opened Jun 15, 2023
More convenient `IndsNetwork` constructors Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

ITensor/ITensorNetworks.jl#86 · Opened Apr 14, 2023
Algorithm for Projecting to a Specific total QN Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#75 · 1 comment · Opened Mar 12, 2023
General interface for gauge constraints of tensor networks Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#70 · Opened Feb 21, 2023
Improvements to `alternating_update` Open

Difficulty 5/5 Over a week Newbie friendliness 18/100

ITensor/ITensorNetworks.jl#60 · 3 comments · Opened Feb 2, 2023
Define set operations for external indices of tensor networks Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#58 · Opened Feb 1, 2023
Use `Graphs.center` in `default_root_vertex` Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#49 · Opened Jan 18, 2023
Convenient constructors for special networks Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#48 · Opened Jan 17, 2023
Support MPO-(MPS with dangling site indices) contraction Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#46 · 11 comments · Opened Jan 12, 2023
Use `external_inds` and `edge_inds`/`internal_inds` as alternatives to `siteinds` and `linkinds` Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

ITensor/ITensorNetworks.jl#40 · 1 comment · Opened Jan 5, 2023
`ITensors.MPS`/`ITensors.MPO` graph interface layer Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ITensor/ITensorNetworks.jl#37 · 3 comments · Opened Dec 23, 2022
`internal_edges` function Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#36 · Opened Dec 23, 2022
Account for weights of a graph/tensor network in graph partitioning Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#35 · Opened Dec 23, 2022
`broadcast` for `AbstractITensorNetwork` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#33 · Opened Dec 22, 2022
`iterate` for `ITensorNetwork`s Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ITensor/ITensorNetworks.jl#32 · Opened Dec 22, 2022
`@visualize` for `AbstractNamedGraph` Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

ITensor/ITensorNetworks.jl#29 · Opened Dec 20, 2022
Convenient constructors for tensor networks on grids Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#27 · Opened Dec 20, 2022
Only one `TreeTensorNetwork`/`TTN` instead of seperate `TTNS`/`TTNO` types Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ITensor/ITensorNetworks.jl#26 · 3 comments · Opened Dec 20, 2022
Implement `inner`/`loginner` for TTN in terms of `contract` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#25 · Opened Dec 20, 2022
Define `tree_orthogonalize(tn::ITensorNetwork, vertex[, distance=nv(tn)])` Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

ITensor/ITensorNetworks.jl#20 · 1 comment · Opened Nov 6, 2022
Bandwidth minimization Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#19 · 2 comments · Opened Nov 6, 2022
Implement boundary MPS contraction for grid networks Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ITensor/ITensorNetworks.jl#15 · 1 comment · Opened Nov 1, 2022
Implement `Graphs.union` for `ITensorNetwork` (or general `DataGraph`s) Open

Difficulty 5/5 Over a week Newbie friendliness 32/100

ITensor/ITensorNetworks.jl#14 · Opened Nov 1, 2022
Generalize `contract(::ITensorNetwork, ::AbstractEdge)` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#12 · 1 comment · Opened Nov 1, 2022
Add index combining features Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ITensor/ITensorNetworks.jl#10 · Opened Oct 25, 2022
Allow passing a `Graphs.SimpleGraph` to `siteinds` Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

ITensor/ITensorNetworks.jl#7 · 1 comment · Opened Sep 23, 2022

ITensor/ITensorNetworks.jl

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