[Stack 7/17] Fix D4: pseudocount formula#2514
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jucor wants to merge 1 commit intospr/edge/c0a682ecfrom
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[Stack 7/17] Fix D4: pseudocount formula#2514jucor wants to merge 1 commit intospr/edge/c0a682ecfrom
jucor wants to merge 1 commit intospr/edge/c0a682ecfrom
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This was referenced Mar 30, 2026
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## Summary - Change `PSEUDO_COUNT` from 1.5 to 2.0, matching Clojure's Beta(2,2) prior - This changes probability smoothing from `pa = (na + 0.75)/(ns + 1.5)` to `pa = (na + 1)/(ns + 2)` - All `pa`/`pd` values now match Clojure's `p-success` exactly (verified on all datasets with Clojure blobs) ## Changes - `repness.py`: `PSEUDO_COUNT = 2.0` with updated comment - `test_discrepancy_fixes.py`: remove xfail from 3 D4 tests (constant check, pa values per dataset, synthetic) - `test_repness_unit.py`, `test_old_format_repness.py`: import `PSEUDO_COUNT` instead of hardcoding 1.5 - `simplified_repness_test.py`: update hardcoded constant - Golden snapshots re-recorded for public datasets (vw, biodiversity) ## Test plan - [x] TDD red: 6 D4 tests fail before fix - [x] TDD green: all 6 D4 tests pass after fix - [x] Full public suite: 258 passed, 0 failures - [x] Private datasets (--include-local): 60 passed, 0 failures (discrepancy tests) - [x] Regression tests pass on public + FLI + bg2018 🤖 Generated with [Claude Code](https://claude.com/claude-code) ## Squashed commits - Fix D4: PSEUDO_COUNT 1.5 → 2.0 to match Clojure's Beta(2,2) prior - Journal: add session 6 (D4 fix), update plan marking D4 done commit-id:6ae3ee43
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Summary
PSEUDO_COUNTfrom 1.5 to 2.0, matching Clojure's Beta(2,2) priorpa = (na + 0.75)/(ns + 1.5)topa = (na + 1)/(ns + 2)pa/pdvalues now match Clojure'sp-successexactly (verified on all datasets with Clojure blobs)Changes
repness.py:PSEUDO_COUNT = 2.0with updated commenttest_discrepancy_fixes.py: remove xfail from 3 D4 tests (constant check, pa values per dataset, synthetic)test_repness_unit.py,test_old_format_repness.py: importPSEUDO_COUNTinstead of hardcoding 1.5simplified_repness_test.py: update hardcoded constantTest plan
🤖 Generated with Claude Code
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