Quantinuum/lambeq

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A high-level Python library for Quantum Natural Language Processing

Stars: 540
Forks: 129
Open beginner issues: 0
Indexed issues: 28
Avg merge: 3d 20h
Merged PRs (30d): 1

Dominant language: Python
License: Apache-2.0
Last GitHub push: Sep 1, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

28 open issues indexed

BobcatParser model download fails due to unreachable qnlp.cambridgequantum.com (DNS resolution error) Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

Quantinuum/lambeq#257 · 2 comments · 1 reaction · Opened Feb 14, 2026
BobcatParser fails: ModelDownloaderError (URL qnlp.cambridgequantum.com is unreachable/unknown host) Open

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

Quantinuum/lambeq#254 · 3 reactions · Opened Dec 3, 2025
Unable to reach URL https://qnlp.cambridgequantum.com/ Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

Quantinuum/lambeq#253 · 1 comment · 2 reactions · Opened Dec 2, 2025
Add free fermions support to lambeq circuits Open

enhancement

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

Quantinuum/lambeq#244 · Opened May 8, 2025
`quantum.Diagram.eval()` method works only with Tket backends Open

fix

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

Quantinuum/lambeq#243 · Opened May 8, 2025
Organise converters and interfaces Open

enhancement fix

Difficulty 4/5 3-5 days Newbie friendliness 38/100

Quantinuum/lambeq#242 · Opened May 8, 2025
DisCoCirc: Remove unnecessary swaps from diagrams Open

enhancement

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

Quantinuum/lambeq#230 · Opened Mar 28, 2025
Refactor/simplify training module Open

enhancement up-for-grabs

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

Quantinuum/lambeq#221 · Opened Feb 25, 2025
Huggingface complains about a forked process when using BobCat and the QuantumModel Open

fix

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

Quantinuum/lambeq#218 · Opened Feb 20, 2025
RemoveSwapsRewriter may fail if diagram is not normalised Open

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

Quantinuum/lambeq#215 · Opened Feb 20, 2025
Update CLI with new features Open

fix

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

Quantinuum/lambeq#214 · Opened Feb 20, 2025
Update copyright notice in source files for new release Open

Quantinuum/lambeq#213 · 1 comment · 1 assignee · Opened Feb 20, 2025
Unexpected Results Depending on DisCoPy Installation Timing Open

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

Quantinuum/lambeq#207 · 6 comments · Opened Feb 13, 2025
DisCoCirc: Wrong wire assignments with sandwich functor Open

bug

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

Quantinuum/lambeq#200 · 1 comment · Opened Dec 13, 2024
DisCoCirc: Add more tests Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

Quantinuum/lambeq#198 · Opened Dec 5, 2024
DisCoCirc: Include pruned nouns as simple boxes Open

enhancement

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

Quantinuum/lambeq#194 · 1 comment · Opened Dec 2, 2024
Pregroup tree rewrites: Possibility of merging nodes when > 1 children are present, but only one has the correct type Open

enhancement

Quantinuum/lambeq#188 · 1 assignee · Opened Nov 18, 2024
DisCoCirc: Coreference problem with plural pronouns Open

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

Quantinuum/lambeq#186 · Opened Nov 18, 2024
Frames: Create function that gives the nouns in the order they appear in the diagram Open

enhancement

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

Quantinuum/lambeq#182 · Opened Nov 14, 2024
Frame drawing: Some wires still cross frames Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

Quantinuum/lambeq#176 · Opened Nov 6, 2024
Frame drawing: Some boxes/frame are still rendered lower than expected Open

bug

Quantinuum/lambeq#172 · 1 assignee · Opened Nov 5, 2024
Frame drawing: Some nouns not moved to the top Open

bug

Quantinuum/lambeq#171 · 1 assignee · Opened Nov 5, 2024
Inner product between two quantum circuits Open

bug

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

Quantinuum/lambeq#154 · 3 comments · Opened Sep 22, 2024
Circuit not runnig by this backend instance. Open

Quantinuum/lambeq#153 · 1 comment · 1 assignee · Opened Sep 10, 2024
Fix transformers-related warning Open

fix

Difficulty 1/5 Under an hour Newbie friendliness 52/100

Quantinuum/lambeq#148 · 1 comment · Opened Aug 26, 2024
Improve RemoveCupsRewriter Open

up-for-grabs

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

Quantinuum/lambeq#141 · Opened May 7, 2024
Implement ASCII drawing for all lambeq diagrams Open

up-for-grabs

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

Quantinuum/lambeq#140 · 2 comments · Opened May 7, 2024
Add more tutorials and example notebooks in the documentation Open

documentation good first issue up-for-grabs

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

Quantinuum/lambeq#107 · 4 comments · 1 reaction · Opened Jun 19, 2023

Quantinuum/lambeq

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