docs/FEATURES.md

Exact ordered feature schema

build_features returns31float64 slots in the following order. UtilityModel.load validates that order against the saved checkpoint; preprocessing uses the saved DEV-only medians,means and scales. Never reorder columns or fit a new scaler on an evaluation cohort.

Here s=selected FT5 score,f=full FT5 score,d=B192 score. The implementation factcascade/features.py is authoritative for regex/token/overlap details and missing-data behavior.

Slot	Name	Meaning
1	ft5_score	Selected FT5 support score s.
2	ft5_abs_distance_to_calibrated_threshold	abs(s-0.763).
3	b192_score	B192 support score d.
4	ft5_b192_delta	s-d.
5	ft5_b192_disagreement	Indicator of (s>0.763) differing from (d>=0.398).
6	table_or_mixed_indicator	TABLE_OR_MIXED modality flag.
7	ft5_margin_x_table	abs(s-0.763) multiplied by table flag.
8	ft5_full_score	Full-packet FT5 support score f.
9	selected_full_score_delta	f-s.
10	selected_full_disagreement	Indicator of (f>0.763) differing from (s>0.763).
11	log_ft5_selected_chunks	log1p(selected FT5 chunk count).
12	log_ft5_full_chunks	log1p(full FT5 chunk count).
13	log_claim_word_count	log1p(claim whitespace word count).
14	log_selected_evidence_words	log1p(selected-evidence whitespace word count).
15	log_full_evidence_words	log1p(full-evidence whitespace word count).
16	log_selected_source_count	log1p(selected-source count).
17	selected_source_coverage_ratio	Supplied selected-source coverage ratio.
18	ft5_selected_margin_to_050	abs(s-0.5).
19	ft5_selected_margin_to_0763	abs(s-0.763).
20	ft5_full_minus_selected	f-s.
21	b192_minus_ft5_selected	d-s.
22	b192_ft5_decision_disagreement	Historical extra-block disagreement: DEV uses s>0.763, external uses s>0.5, against d>=0.398.
23	full_only_support_signal	Indicator of f>0.763 and s<=0.763.
24	b192_disagreement_x_table_or_mixed	Slot22 disagreement multiplied by table flag.
25	selected_full_discrepancy_x_evidence_length_ratio	abs(f-s)*log1p(full words)/max(1,log1p(selected words)).
26	claim_negation_proxy_count	Negation matches plus bounded content terms in negation scope; surface proxy.
27	claim_comparator_quantifier_count	Comparator/quantifier regex match count.
28	claim_numeral_unit_count	Numeral/unit regex match count.
29	claim_titlecase_entity_proxy_count	Titlecase entity surface-proxy count,capped at20; no NER model.
30	claim_selected_number_overlap_ratio	Claim numeric strings shared with selected evidence / claim numeric-string count;0 if empty.
31	claim_entity_selected_minus_full_overlap	Claim-entity overlap with selected evidence minus overlap with full evidence;0 for empty claim entity set.

Some original names use "disagreement" for a label-derived indicator:slot5 uses the calibrated fallback convention,while slot22 uses the adapter-specific historical convention. Allocation independently uses the raw score gap abs(s-d) in equal-weight rank fusion. These quantities must not be conflated or silently recalibrated.

Required build_features keyword arguments:claim,selected_evidence,full_evidence,selected_ft5_score,full_ft5_score,deberta_score,selected_chunks,full_chunks. Optional values are selected_source_count,source_coverage,table_or_mixed,adapter;use registered source geometry and explicit adapter. adapter="external" is default,while "dev" preserves the historical extra-block convention. The trained loader supports saved missing-value imputation;the convenience constructor validates supplied scores/counts/text and returns a finite feature vector.

This API consumes native verifier observations;it does not run inference,generate evidence,select a source protocol or infer that two adapters are scientifically interchangeable.