[bobbypaton]

Summary

Runs MACE-OMOL-0, SevenNet-Omni, AIMNet2, AIMNet2-rxn, ORB-v3 conservative OMol and OrbMol-v2 through scripts/make_claisen_structures.py, the same Claisen check used for GFN2-xTB and UMA. It also fixes the three --calc entries that could not run these models.

Results

All six find the concerted [3,3] transition structure and pass the script's checks. The table gives corrected KIEs at 393 K relative to C5, against Meyer, DelMonte and Singleton (JACS 1999, Table 4):

Potential	Imaginary mode	Mean abs. deviation	²H₂ KIE at C1 (not measured)
B3LYP/6-31G(d), s = 0.961	483i	0.0009	0.957
MACE-OMOL-0	640i	0.0009	1.003
SevenNet-Omni (omol25_low)	652i	0.0010	0.950
UMA-s-1p1	611i	0.0011	0.969
AIMNet2 (ωB97M-D3)	440i	0.0029	0.846
ORB-v3 conservative OMol	653i	0.0030	1.165
OrbMol-v2	649i	0.0031	1.124
AIMNet2-rxn	575i	0.0044	0.992

The ORB models find the right saddle point, but their Hessians have two separate problems:

• Orientation dependence. Their energies change when the molecule is rotated: by up to 24 meV (ORB-v3) and 15 meV (OrbMol-v2) over 20 orientations of the transition structure. The other potentials vary by 0.004 meV or less. As a result:
  • the water EQE (swapping ²H between the two equivalent hydrogens, exactly 1 by symmetry) comes out 0.9996 and 1.0009;
  • rotating the Claisen structures moves the ORB-v3 KIEs by up to 0.0016.
• A soft transition structure. In every orientation, the transition structure's modes above 700 cm⁻¹ are 4–5% below UMA's. The reactant frequencies agree with UMA's to 0.2%. This gives C5, which does not react, an absolute KIE of 1.011–1.013, and gives the C1 hydrogens a normal ²H₂ KIE of 1.12–1.16. The ORB Hessians match the curvature of ORB's own energies, so the softening comes from the potential, not from the finite differences.

The example now recommends checking the Hessian as well as the saddle point: a symmetric EQE and the energy of the rotated molecule.

Numerical checks on the other Hessians:

• The water EQE is 1 within 2 × 10⁻⁷ for every other potential, including the single-precision ones (SevenNet, AIMNet2).
• AIMNet2's analytic Hessians match central differences to 1.5 × 10⁻⁵.
• Changing the stencil moves the ¹³C and ¹⁷O KIEs by less than 2 × 10⁻⁵.

Code changes (kinisot/backends/ase.py)

• --calc sevennet[:model[:task]]: multi-task models need a task, as in sevennet:7net-omni:omol25_low. A missing or unknown task is now an input error that lists the valid tasks. A checkpoint path is never split at a colon.
• --calc aimnet2[:model] uses the current aimnet package and falls back to aimnet2calc. Registry names such as aimnet2-rxn work, and a model that fails to load is an input error.
• Fix: --calc orb with the molecular models (OrbMol, orb-v3-*-omol) failed because they need a charge and spin multiplicity in atoms.info. They now default to a neutral singlet. Values read back from extended XYZ are numpy integers, which orb-models rejects, so they are converted to Python numbers. UMA uses the same helper.
• The --calc help text now lists xtb, uma and the model/task syntax.

Data, tests, docs

• tests/data/mlip_claisen/<potential>/: structures and Hessians for the six potentials (556 KB).
• tests/test_ase.py:
  • fake-module tests for the ORB charge/spin handling, SevenNet task parsing and the AIMNet2 package fallback (all three fail on the old code);
  • a parametrized test that checks every committed set, UMA's included, against the example's table.
• Updated: examples/mlip_claisen/README.md (new section, saddle-point table rows, licence note), docs/faq.md, docs/file_formats.md, CHANGELOG, IMPLEMENTATION_PLAN, REVIEW.md.
• These runs are not added as benchmark cases, so the overall benchmark mean stays at 0.0047.

Verification

• ruff check . and ruff format --check . are clean.
• pytest tests/: 250 passed, 1 skipped.
• tests/test_ase.py also passes in an environment with the real sevenn, aimnet and fairchem packages installed.
• kinisot --calc orb:orbmol-v2, --calc sevennet:7net-omni:omol25_low and --calc aimnet2:aimnet2-rxn run end to end on copies of the committed .xyz files and reproduce the committed C4 KIEs.
• Versions used: mace-torch 0.3.16, sevenn 0.13.0, aimnet 0.2.0, orb-models 0.7.0 (which needs Python 3.12).

Summary by CodeRabbit

• New Features
  • Added support for selecting SevenNet models and tasks, AIMNet2 models, and ORB models. Molecular UMA and ORB calculations default to a neutral singlet when charge and spin are not specified.
  • Added comparisons of six additional machine-learned potentials on the Claisen reaction. SevenNet-Omni, MACE-OMOL-0, and UMA match B3LYP’s measured KIE accuracy; ORB results vary with molecular orientation and show overly soft transition-state modes.
• Documentation
  • Updated calculator options, model setup guidance, and Claisen comparison results.

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📝 Walkthrough

Walkthrough

Adds ASE calculator setup for SevenNet and AIMNet2 and charge and spin handling for molecular ORB and UMA models. Adds Claisen structures, Hessians, and tests for six additional MLIP datasets, and updates documentation with evaluation results and calculator options.

Changes

Calculator Support and Claisen Evaluation

Layer / File(s)	Summary
Calculator selection and metadata handling kinisot/backends/ase.py, kinisot/cli.py, docs/file_formats.md, examples/mlip_claisen/README.md, CHANGELOG.md, tests/test_ase.py	The ASE registry now uses wrappers for SevenNet and AIMNet2. SevenNet accepts model and task selectors, and AIMNet2 tries aimnet before aimnet2calc. ORB and UMA apply neutral-singlet defaults when charge and spin are missing; ORB and UMA also convert NumPy scalar values. CLI help and documentation describe the calculator options. Tests cover wrapper behavior and input errors.
Claisen structures and validation tests/data/mlip_claisen/*, tests/test_ase.py	Adds ground-state and transition-state XYZ and Hessian data for AIMNet2, AIMNet2-rxn, MACE-OMOL-0, ORB-v3 OMol, OrbMol-v2, and SevenNet-Omni. Tests check structures, imaginary modes, tunneling KIEs, and deviations from measured values.
Evaluation findings and documentation CHANGELOG.md, IMPLEMENTATION_PLAN.md, REVIEW.md, docs/faq.md, examples/mlip_claisen/README.md	Reports transition-structure and KIE results for the additional potentials. Documents ORB energy orientation dependence and soft transition-state modes, and adds Hessian validation guidance and calculator setup notes.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Registry as Calculator registry
  participant SevenNetWrapper as sevennet_calculator
  participant SevenNet as SevenNet calculator
  participant AIMNetWrapper as aimnet2_calculator
  participant AIMNet as aimnet or aimnet2calc
  Registry->>SevenNetWrapper: Dispatch sevennet selection
  SevenNetWrapper->>SevenNet: Construct model with optional task
  Registry->>AIMNetWrapper: Dispatch aimnet2 selection
  AIMNetWrapper->>AIMNet: Import and construct selected model

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Merge Risk: 🔵 Low · up to e817e

An AIMNet installation failure may report the wrong cause, making setup harder to diagnose. The remaining risk is bounded, but the fallback should be narrowed before merge if practical.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 27.27% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 22 functions across 3 files. (30 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes: adding a Claisen check for six ML potentials and updating calculator options for SevenNet, AIMNet, and ORB charge/spin handling.

Full details: Docstring Coverage

Explanation

Docstring coverage is 27.27% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 22 functions across 3 files. (30 skipped: 30 unsupported.)

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Actionable comments posted: 1

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Inline comments:
Review comments at @kinisot/backends/ase.py:
- Around line 194-200: Update the primary import fallback in the AIMNet2ASE
import block to fall back only when ModuleNotFoundError identifies aimnet,
aimnet.calculators, or aimnet.calculators.aimnet2ase as missing; re-raise plain
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📥 Commits

Reviewing files that changed from the base of the PR and between 34af4c6 and e817e5d.

📒 Files selected for processing (33)

• CHANGELOG.md
• IMPLEMENTATION_PLAN.md
• REVIEW.md
• docs/faq.md
• docs/file_formats.md
• examples/mlip_claisen/README.md
• kinisot/backends/ase.py
• kinisot/cli.py
• tests/data/mlip_claisen/aimnet2/claisen_gs.hessian.json
• tests/data/mlip_claisen/aimnet2/claisen_gs.xyz
• tests/data/mlip_claisen/aimnet2/claisen_ts.hessian.json
• tests/data/mlip_claisen/aimnet2/claisen_ts.xyz
• tests/data/mlip_claisen/aimnet2_rxn/claisen_gs.hessian.json
• tests/data/mlip_claisen/aimnet2_rxn/claisen_gs.xyz
• tests/data/mlip_claisen/aimnet2_rxn/claisen_ts.hessian.json
• tests/data/mlip_claisen/aimnet2_rxn/claisen_ts.xyz
• tests/data/mlip_claisen/mace_omol/claisen_gs.hessian.json
• tests/data/mlip_claisen/mace_omol/claisen_gs.xyz
• tests/data/mlip_claisen/mace_omol/claisen_ts.hessian.json
• tests/data/mlip_claisen/mace_omol/claisen_ts.xyz
• tests/data/mlip_claisen/orb_v3_omol/claisen_gs.hessian.json
• tests/data/mlip_claisen/orb_v3_omol/claisen_gs.xyz
• tests/data/mlip_claisen/orb_v3_omol/claisen_ts.hessian.json
• tests/data/mlip_claisen/orb_v3_omol/claisen_ts.xyz
• tests/data/mlip_claisen/orbmol_v2/claisen_gs.hessian.json
• tests/data/mlip_claisen/orbmol_v2/claisen_gs.xyz
• tests/data/mlip_claisen/orbmol_v2/claisen_ts.hessian.json
• tests/data/mlip_claisen/orbmol_v2/claisen_ts.xyz
• tests/data/mlip_claisen/sevennet_omni/claisen_gs.hessian.json
• tests/data/mlip_claisen/sevennet_omni/claisen_gs.xyz
• tests/data/mlip_claisen/sevennet_omni/claisen_ts.hessian.json
• tests/data/mlip_claisen/sevennet_omni/claisen_ts.xyz
• tests/test_ase.py

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