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Declare the response-time support edge in the model configs (ndt_edge_shift) - #370
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…st models HSSM (lnccbrown/HSSM#1292, #1358) reads where a model's response-time support starts from the per-model config, and ssms owns that fact: its own KDE label estimator needs it, and HSSM mirrors ssms configs for LAN models. ddm_st, full_ddm (and its alias full_ddm2) and full_ddm_rv draw the non-decision time as t + U(-st, st), so their RTs start at t - st. Every other model's support starts at t and declares nothing. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
A malformed declaration would silently mislead HSSM's likelihood floor and the KDE estimator, so check its shape once (a dict with exactly param and scale, both param and t in params, a finite non-negative scale) in one helper shared by ModelConfigBuilder.validate_config and the import-time registry check, and let from_scratch keep the key like the other optional fields. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Check the declarations against the simulators (min(rt) >= t - scale * param on several parameter sets, and RTs below t at the corner so the declaration is not vacuous), that undeclared models start at t, that declaring models stay in KDE_NO_DISPLACE_T, and that the builder and validators carry and police the key. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Add the key to the places that list the model-config fields for users: the configs tutorial, the contributing guide's Level 1 example notes, and the add-ssm-model skill. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
min(rt) >= t - scale * st holds for any scale that is too large, so a declaration twice the true shift passed every test. Pin the shipped value for each declaring model, and check at the a-lower corner that the fastest RTs fall below t - scale * st / 2, which they only do (by about 0.1 s) when the scale is right. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
get_invalid_ndt_edge_shift_configs was tested on its own, but the call from _validate_configs() could be dropped without a test noticing. Swap in a one-config registry whose only fault is the declaration and check the import-time validator raises on it. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
At the plain corner (t at its lower bound, st at its upper bound, the rest mid-box) only a handful of the 3000 simulated RTs fall below t, and the count depends on the RNG stream, so the assertion could flake. The a-lower corner puts hundreds below t and is the one that matters. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The skill's field table documents the key; its checklist did not remind an author to declare it when the non-decision time varies per trial. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughAdds the optional ChangesNon-decision-time edge shifts
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Merge Risk: 🔵 Low · up to A malformed custom model configuration can pass validation. This is a narrow gap and does not block merging, but it merits a localized fix. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Review comments at @ssms/config/_modelconfig/validation.py:
- Around line 86-88: Update the ndt_edge_shift validation in
ModelConfigBuilder.validate_config to reject param values that are not strings
before checking membership in params; retain the existing unknown-name error for
strings absent from params. Add a malformed-declaration test covering a numeric
param value when params also contains that number.
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| param = shift.get("param") | ||
| if param not in params: | ||
| errors.append(f"ndt_edge_shift param {param!r} is not in params") |
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🗄️ Data Integrity & Integration | 🟡 Minor | ⚡ Quick win
Reject a non-string ndt_edge_shift parameter.
If a custom config has params=["t", 1] and ndt_edge_shift={"param": 1, "scale": 1.0}, this membership check accepts the declaration. ModelConfigBuilder.validate_config can then report a valid config, although param is not a parameter name. Check that param is a string before accepting its membership in params. Add this case to the malformed-declaration tests.
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Review comment at @ssms/config/_modelconfig/validation.py around lines 86 - 88:
Update the ndt_edge_shift validation in ModelConfigBuilder.validate_config to
reject param values that are not strings before checking membership in params;
retain the existing unknown-name error for strings absent from params. Add a
malformed-declaration test covering a numeric param value when params also
contains that number.
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"Absent means RTs start at t" was wrong for kernels with no lower edge (ddm_normal_st, now on main) and for models without a t parameter; absence only means that no finite edge below t is declared. The docs now say so, list the cases where the key must be left out, state the scale convention (1.0 for a half-width), and tell a model author to add declaring and unbounded models to KDE_NO_DISPLACE_T. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The previous commit reached only the validator docstring. This one covers the builder docstrings, the add-ssm-model skill and its checklist, the contributing guide, the config tutorial and the test-file docstrings: absence means no finite edge below t is declared; leave the key out for models without a t parameter, for kernels with no lower edge (ddm_normal_st) and for edges not of the form t - scale * param; and add declaring and unbounded models to KDE_NO_DISPLACE_T. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This was referenced Oct 7, 2026
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Purpose. Declare, in each model's config, where the response-time support starts, for the simulators whose non-decision time varies per trial with a hard lower edge. HSSM (lnccbrown/HSSM#1292) floors a likelihood below the declared edge and, for LAN likelihoods, keeps its declaration equal to the simulator's with a guard test (lnccbrown/HSSM#1360); ssms' own KDE estimator is the other consumer (today it relies on the hand-kept
KDE_NO_DISPLACE_Tset, and #359 on introspectingt_distpartials).What.
ddm_st,full_ddm(and its aliasfull_ddm2) andfull_ddm_rvdeclare"ndt_edge_shift": {"param": "st", "scale": 1.0}: their non-decision time ist + U(−st, st), so RTs start att − st. No other model declares anything (absence means RTs start att; models withtpinned to 0 and notparameter, or an unbounded kernel, have nothing to declare).get_ndt_edge_shift_errors: dict with exactlyparam/scale, bothparamandtinparams, finite non-negative scale) backsModelConfigBuilder.validate_config, the import-time registry check in_validate_configs(), andfrom_scratchkeeps the key.KDE_NO_DISPLACE_TandLogKDEare untouched; the Displace RTs by the true admissibility boundary t - st, not by t #359 rework can key on the declaration instead oft_distintrospection.add_models.md, and theadd-ssm-modelskill (field table + checklist).Tests (
tests/config/test_ndt_edge_shift.py, 47 cases, ~3 s): every declaring model is simulated on four parameter sets (mid-box, near the upper corner, thet-lower/st-upper corner, and that corner withaat its lower bound) and never emits an RT belowt − scale·st; at thea-lower corner it does emit RTs belowt(the declaration is not vacuous) and belowt − st/2(the scale is tight: a scale twice too large would fail); ten plain models with no key never go belowt; every declaring model is inKDE_NO_DISPLACE_T; the alias,from_model,with_deadlineandfrom_scratchcarry the key; the validator rejects eleven malformed shapes and the import-time hook names a bad config.Checks run.
ruff check,ruff format --checkclean; full suite 1258 passed / 134 skipped (uv sync --all-groups --extra dev); in-memory merges clean against #349, #348, #369, #359, #363.Release note. New optional model-config key; no behaviour change for simulation or label generation. Intended for 0.15.0 so HSSM can rely on it from that floor.
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t.