ITensor / ITensor/ITensorMPS.jl
[ITensors] [ENHANCEMENT] AD `rrules`
Open
Nobody has claimed this yet.
enhancement
- Dominant language
- Julia
- Stars
- 85
- Forks
- 27
- Avg merge
- 22m
- Merged PRs (30d)
- 1
Description
List of rrule currently missing:
Possibly easy to be implemented:
-
MPS(::Vector{ITensor}, ...) -
MPO(::Vector{ITensor}, ...) -
convert(MPS, ::MPO) -
*(::Number, ::MPS)/*(::Number, ::MPO) -
outer(::MPS, ::MPS) -
apply(U, ...)whereUis a single tensor (instead of a vector)
Requires more thought:
-
apply(U, ::MPS)with "noisy" (rank-3)Utensor -
exp(::OpSum; kwargs...), including the entireOpsystem. -
entanglemententropy(::MPS)for disentangling unitary optimization.
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the unchecked API entry points listed in the issue, including MPO construction, MPS/MPO conversion and scalar multiplication, then review the existing MPS constructor marked complete for precedent. The work is done when the selected missing rrules are implemented and the behavior of each listed operation is verified, with the items requiring more thought resolved separately.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- julia
- Domain
- hpc
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100