Issues

• ITensorMPS and CUDA.jl Duplication / Erroneous Memory Allocations in DMRG

  ITensor/ITensorMPS.jl#209 · Filter by author mblomquist opened on Apr 22, 2026

• [BUG] Vector of MPOs in DMRG works for the ground state, but it does not work for the excited states.

  bug
  ITensor/ITensorMPS.jl#207 · Filter by author sumanphy opened on Apr 14, 2026

• [BUG] write_when_maxdim_exceeds not working for TDVP

  bug
  ITensor/ITensorMPS.jl#176 · Filter by author mwauters92 opened on Feb 20, 2026

• Typo in definition of "Adagdn" for ElecK site type in the example

  bug
  ITensor/ITensorMPS.jl#175 · Filter by author liuzhaochen opened on Feb 16, 2026

• Problem with TEBD on Fermi-Hubbard model with Electron indices

  ITensor/ITensorMPS.jl#159 · Filter by author MatteDAnna opened on Oct 6, 2025

• [ENHANCEMENT] Have op_term(::Tuple{Number}) return the identity

  enhancement
  ITensor/ITensorMPS.jl#154 · Filter by author jlbosse opened on Aug 19, 2025

• [ENHANCEMENT] OpSum term to ITensor

  enhancement
  ITensor/ITensorMPS.jl#150 · Filter by author nicolasloizeau opened on Aug 4, 2025
  1

• [BUG] write_when_maxdim_exceeds not working for excited state dmrg calculation

  bug
  ITensor/ITensorMPS.jl#145 · Filter by author ckaronoff opened on Jun 13, 2025

• [BUG] Misleading presence of normalize keyword in orthogonalize!

  bug
  ITensor/ITensorMPS.jl#140 · Filter by author VinceNeede opened on Apr 16, 2025
  4

• [BUG] Fail to add noise to TDVP

  bug
  ITensor/ITensorMPS.jl#130 · Filter by author fliingelephant opened on Mar 25, 2025
  1

• Strange numerical issue when making an MPS, works fine on Linux, Nan issues on Mac

  ITensor/ITensorMPS.jl#110 · Filter by author wjhuggins opened on Jan 23, 2025
  15

• Issue in mps.jl file, line 899

  ITensor/ITensorMPS.jl#105 · Filter by author dhqian opened on Dec 24, 2024
  3

• [BUG] ChainRule for norm function

  bug
  ITensor/ITensorMPS.jl#95 · Filter by author davidsmp opened on Nov 18, 2024
  4

• Issue running Trotter-Suzuki example

  ITensor/ITensorMPS.jl#90 · Filter by author nikita-astronaut opened on Oct 29, 2024
  2

• Implement local subspace expansion

  ITensor/ITensorMPS.jl#41 · Filter by author mtfishman opened on Oct 25, 2024

• Set eager=true in exponentiate backend

  ITensor/ITensorMPS.jl#40 · Filter by author mtfishman opened on Oct 18, 2024

• [ITensorMPS] [BUG] Default algorithm for adding MPSs leading to large bond dimensions

  bug
  ITensor/ITensorMPS.jl#86 · Filter by author shinaoka opened on Oct 14, 2024
  11

• dmrg_x does not support write to disk

  ITensor/ITensorMPS.jl#25 · Filter by author kojionrzl opened on Aug 28, 2024
  2

• [ITensors] [BUG] Itensors refuses "weight" argument to DMRG

  bug
  ITensor/ITensorMPS.jl#89 · Filter by author marcio053 opened on Aug 6, 2024
  3

• [ITensors] [ENHANCEMENT] Expose ConvergenceInfo in calls to KrylovKit methods

  enhancement
  ITensor/ITensorMPS.jl#88 · Filter by author NuclearPowerNerd opened on Jul 10, 2024

• [ENHANCEMENT] Expose truncerr in calls to truncate!

  enhancement
  ITensor/ITensorMPS.jl#96 · Filter by author NuclearPowerNerd opened on Jul 2, 2024
  4

• Test GPU compatibility using JLArrays

  ITensor/ITensorMPS.jl#39 · Filter by author mtfishman opened on Jun 20, 2024

• Add support for running examples on GPU and test on GPU

  ITensor/ITensorMPS.jl#23 · Filter by author mtfishman opened on Jun 2, 2024
  1

• Sparse diagonalization methods for getting the relevant spectrum of the projected Hamiltonian?

  ITensor/ITensorMPS.jl#38 · Filter by author noh827 opened on May 6, 2024
  1

• [ITensors] [BUG] add(::MPS, ::MPS; alg="directsum") broken for mismatched arrow directions

  bug
  ITensor/ITensorMPS.jl#85 · Filter by author mtfishman opened on Feb 21, 2024