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Keep ddm and ddm_sdv LAN bounds inside the networks' training ranges - #1441
ddm (ddm.onnx): z bound (0.0, 1.0) → (0.1, 0.9), the training range (ssms param_bounds, Fengler et al. 2021).
ddm_sdv (ddm_sdv.onnx): t and sv lower edges 0.0 → 0.001, as recorded in the network's HF data_details.
Only config bounds change; no core code. The analytical and blackbox likelihoods are unchanged.
What users see with these LAN likelihoods: default z prior Uniform(0.1, 0.9); sv prior Uniform(0.001, 2.5); log_logit maps z into (0.1, 0.9); a fixed sv=0.0 now raises ValueError (use model="ddm"); RLSSM decision processes inherit the new bounds.
Approximate DDM models now use a z range of 0.1–0.9. In ddm_sdv, t and sv now have minimum values of 0.001; other parameter bounds are unchanged.
Fixed z values outside 0.1–0.9 are rejected for approximate ddm, and fixed zero values for t or sv are rejected for approximate ddm_sdv. Use ddm for zero drift variability.
Documentation
Updated the changelog with the revised bounds and behavior.
… box (#1440)
ddm.onnx was trained on z in [0.1, 0.9] but the approx_differentiable
config allowed (0.0, 1.0); ddm_sdv.onnx was trained on t, sv >= 0.001
but the config started both at 0.0. Narrow the bounds to the training
range, drop the ("ddm", "z") waiver and the lower-edge rounding
tolerance from the training-box guard, and pin the corrected values.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The approx_differentiable bounds for ddm.z, ddm_sdv.t, and ddm_sdv.sv now match their network training ranges. Tests pin the bounds, and the changelog describes the changes.
Changes: LAN training-range bounds
Layer / File(s)
Summary
Update LAN bounds and validation src/hssm/modelconfig/ddm_config.py, src/hssm/modelconfig/ddm_sdv_config.py, tests/unit/modelconfig/test_lan_bounds_match_training.py, docs/changelog.md
The LAN bounds change to ddm.z (0.1, 0.9), ddm_sdv.t (0.001, 2.0), and ddm_sdv.sv (0.001, 2.5). Tests use a stricter lower-bound comparison and pin all three ranges. The changelog describes the bounds and their documented effects.
lnccbrown/HSSM#1486: This PR updates the bounds that affect default priors, but it does not change where default priors are declared.
lnccbrown/HSSM#1472: The ddm_sdv lower-bound changes affect the bounds midpoint, but the generic intercept-prior rule is unchanged.
Suggested reviewers:cpaniaguam
Merge Risk: Minimal · previous review 429ff
This change keeps the ddm and ddm_sdv LAN bounds inside the networks' training ranges. Fixed values outside those ranges are now rejected, and the changelog documents this. No remaining merge-blocking risk was identified.
Pre-merge checks: 4 · 1
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Title check
The title names the main change: the ddm and ddm_sdv LAN bounds are kept inside the networks' training ranges. The changeset does this. It changes the ddm z bound from (0.0, 1.0) to (0.1, 0.9), change…
Linked Issues check
Issue #1440 is the only active direct link, so its coding requirements apply. The requirements are: set the ddm LAN z bound to the training range, set the ddm_sdv LAN t and sv lower bounds t…
Out of Scope Changes check
The config diffs contain only the bounds values for ddmz and ddm_sdvt and sv, plus comments that cite the training range and #1440. These edits implement the linked objective. The change…
Full details: Title check
Explanation
The title names the main change: the ddm and ddm_sdv LAN bounds are kept inside the networks' training ranges. The changeset does this. It changes the ddm z bound from (0.0, 1.0) to (0.1, 0.9), changes the ddm_sdv t and sv lower bounds from 0.0 to 0.001, and updates the bounds test to match. The title is specific and short. It does not list every detail, such as the ValueError for fixed sv=0.0 or the changelog entry, and that is acceptable.
Full details: Linked Issues check
Explanation
Issue #1440 is the only active direct link, so its coding requirements apply. The requirements are: set the ddm LAN z bound to the training range, set the ddm_sdv LAN t and sv lower bounds to 0.001, and add tests that pin LAN config bounds to their training ranges. The reviewed head meets the config requirements. The whole-PR diff against the merge base changes src/hssm/modelconfig/ddm_config.pyz from (0.0, 1.0) to (0.1, 0.9). It changes src/hssm/modelconfig/ddm_sdv_config.pyt from (0.0, 2.0) to (0.001, 2.0) and sv from (0.0, 2.5) to (0.001, 2.5). The other bounds are unchanged. The test requirement is met. tests/unit/modelconfig/test_lan_bounds_match_training.py at the reviewed head starts with KNOWN_MISMATCHES empty. Its test_declared_bounds_match_the_training_box compares lower and upper bounds with a 1e-6 tolerance for every built-in LAN config against ssms param_bounds. Its parameterized test pins ddmz to (0.1, 0.9), ddm_sdvt to (0.001, 2.0), and ddm_sdvsv to (0.001, 2.5). The test run was not reproduced here. The audit in #1440 reports no other built-in LAN config needs a change, and none was changed.
Full details: Out of Scope Changes check
Explanation
The config diffs contain only the bounds values for ddmz and ddm_sdvt and sv, plus comments that cite the training range and #1440. These edits implement the linked objective. The changelog entry in docs/changelog.md describes the new LAN behavior and the model="ddm" alternative for fixed sv=0.0. This supports the bounds change. The test file changes support the bounds change. The test file also contains ndt_edge_shift comparison tests. The review summary does not list these as added by this PR, and the PR description does not mention them. The file read did not show whether they existed before this PR. They are test-only and do not change runtime behavior, and no evidence shows they are unrelated. No core code or analytical or blackbox likelihood change appears in the reviewed changes.
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Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 1 functions across 3 files. (1 skipped: 1 unsupported.)
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @docs/changelog.md:
- Line 43: Update the RLSSM bounds statement in the changelog to clarify that
HSSM-registered RLSSMs inherit the new bounds, while
RLSSMConfig.from_ssms_model() uses assembled.bounds and may retain different
bounds.
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from_ssms_model() takes its bounds from the ssms preset, not the HSSM
model config, so only HSSM-built decision processes inherit the change.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Prompt to fix all issues
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main removed the dummy choice-only simulator block next to the
_rearrange_data call (lnccbrown#1416); keep that removal and the fixed-vector
reordering. The changelog entry moves to item 23 after the entries
main added (lnccbrown#1416, lnccbrown#1491, lnccbrown#1441).
Claude helped me with this change.
AxelNoun
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Nov 9, 2026
The changelog entry moves to item 23 after the entries main added
(lnccbrown#1416, lnccbrown#1491, lnccbrown#1441). No code conflict.
Claude helped me with this change.
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Closes #1440
ddm(ddm.onnx):zbound(0.0, 1.0)→(0.1, 0.9), the training range (ssmsparam_bounds, Fengler et al. 2021).ddm_sdv(ddm_sdv.onnx):tandsvlower edges0.0→0.001, as recorded in the network's HFdata_details.boundschange; no core code. The analytical and blackbox likelihoods are unchanged.zpriorUniform(0.1, 0.9);svpriorUniform(0.001, 2.5);log_logitmapszinto(0.1, 0.9); a fixedsv=0.0now raisesValueError(usemodel="ddm"); RLSSM decision processes inherit the new bounds.test_lan_bounds_match_training: drops the("ddm", "z")waiver and the lower-edge rounding tolerance; pins the corrected values. The audit table in LAN default bounds for ddm (z) and ddm_sdv (t, sv) lie outside the networks' training ranges #1440 shows every other built-in LAN config already matches its training range.uv run pytest tests/ -m "not slow"(1543 passed),ruff check,ruff format --check,prekhooks (incl. pyrefly, mypy).🤖 Generated with Claude Code
Summary by CodeRabbit
zrange of 0.1–0.9. Inddm_sdv,tandsvnow have minimum values of 0.001; other parameter bounds are unchanged.zvalues outside 0.1–0.9 are rejected for approximateddm, and fixed zero values fortorsvare rejected for approximateddm_sdv. Useddmfor zero drift variability.