Public recordModerate
Software health reportschema 0.27.0 · metrics 1.13.0 · 2026-07-26 16:41 UTC
bbstats / chimeraboost
A Python-backend gradient boosting library
bbstats/chimeraboost holds a health index of 54 out of 100, placing it in the Moderate band. It scores highest on Vitality (76/100) and lowest on Security (36/100). It was last updated today. A single contributor accounts for most of its recent work.
54
overall / 100Software health index
Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At risk ceiling of 49. AI Readiness sits outside the overall score.
54
Excellent85-100Exemplary; meets essentially all checked criteria
Good70-84Healthy; minor gaps
Moderate50-69Acceptable with notable gaps; review recommended
At risk30-49Significant weaknesses; adoption warrants caution
Critical1-29Severe problems (abandoned, single-maintainer, no hygiene)
Score profile
Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.
Ownership
Nathan WalkerPersonal account
13 followers13 public repossince Apr 2021NFL
This repository is owned by a personal account. A single-owner project carries more continuity risk than an organization-backed one.
Package ecosystems
| Registry | Package | Version | Downloads / mo | Versions | Last publish |
|---|---|---|---|---|---|
| PyPI | chimeraboost | 0.25.0 | 2,036 | 27 | 0 days ago |
Metrics by category
Vitality
Is the project alive — is code being written and are releases shipping?
76
Development activity
60Moderate
How it's scored
| 36/36 | Push recency — last push 0 days ago |
| 5.5/36 | Commit cadence — 8/52 weeks with commits |
| 18/18 | Commit volume — 367 commits in the last year |
| 0/10 | OpenSSF Scorecard: Maintained — project was created within the last 90 days. Please review its contents carefully |
Inputs used
| commits_last_year | 367 |
| human_commit_share | 0.99 |
| days_since_last_push | 0 |
| active_weeks_last_year | 8 |
Release discipline
100Excellent
How it's scored
| 27/27 | Ships releases — 14 releases published |
| 36/36 | Release recency — latest release 2 days ago |
| 27/27 | Release cadence — a release every ~0.8 days |
| 0/10 | OpenSSF Scorecard: Signed-Releases — no data |
Inputs used
| releases_count | 14 |
| latest_release_tag | v0.24.0 |
| releases_from_tags | no |
| days_since_latest_release | 2 |
| mean_days_between_releases | 0.8 |
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.
Community & Adoption
Does the project have users, downloads, attention, and a welcoming setup for contributors?
39
Popularity & adoption
13Critical
How it's scored
| 12.6/60 | Stars — 7 stars |
| 0/25 | Forks — 1 forks |
| 0/15 | Watchers — 0 watchers |
Inputs used
| forks | 1 |
| stars | 7 |
| watchers | 0 |
| growth_state | unverified |
| growth_factor_pct | 100 |
| growth_unverified_reason | no_history |
Community health
57Moderate
How it's scored
| 22.5/22.5 | README |
| 22.5/22.5 | License — recognized license (Apache-2.0) |
| 0/18 | CONTRIBUTING guide |
| 0/13.5 | Code of conduct |
| 0/7.2 | Issue template |
| 6.3/6.3 | PR template |
Inputs used
| has_readme | yes |
| has_license | yes |
| has_contributing | no |
| has_issue_template | no |
| has_code_of_conduct | no |
| has_pull_request_template | yes |
Ecosystem adoption (downloads)
55Moderate
How it's scored
| 44.1/80 | Monthly downloads — 2,036 downloads/month across pypi |
| 0/20 | Registry dependents — not reported by this ecosystem |
Inputs used
| packages | chimeraboost |
| dependents | — |
| ecosystems | pypi |
| total_downloads | — |
| monthly_downloads | 2,036 |
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.
Sustainability & Governance
Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?
45
Maintainer resilience (bus factor)
13Critical
How it's scored
| 9/54 | Bus factor — 1 contributor(s) cover half of all commits |
| 0/22.5 | Commit distribution — top contributor authored 100% of commits |
| 1.4/13.5 | Contributor breadth — 1 contributors |
| 3/10 | OpenSSF Scorecard: Contributors — project has 1 contributing companies or organizations -- score normalized to 3 |
Inputs used
| bus_factor | 1 |
| contributors_sampled | 1 |
| top_contributor_share | 1 |
Issue & PR responsiveness
38At risk
How it's scored
| 0/46.8 | Issue resolution — 0% of issues closed |
| 38.2/38.3 | PR acceptance — 33/33 decided PRs merged |
| 0/15 | OpenSSF Scorecard: Code-Review — Found 0/7 approved changesets -- score normalized to 0 |
Inputs used
| merged_prs | 33 |
| open_issues | 1 |
| closed_issues | 0 |
| issue_closed_ratio | 0 |
| closed_unmerged_prs | 0 |
Ownership & stewardship
47At risk
How it's scored
| 10/30 | Ownership backing — personal (user) account |
| 0/20 | Verified domain — not applicable to user accounts |
| 8.2/25 | Owner reach — 13 followers of bbstats |
| 19/25 | Track record — 13 public repos, account ~5 yr old |
Inputs used
| followers | 13 |
| owner_type | User |
| is_verified | — |
| owner_login | bbstats |
| public_repos | 13 |
| account_age_days | 1,942 |
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.
Package maintenance
100Excellent
How it's scored
| 25/25 | Published & resolvable — 1 package(s) on pypi |
| 35/35 | Publish recency — latest publish 0 days ago |
| 20/20 | Version history — 27 published versions |
| 20/20 | Not deprecated — active, not deprecated or yanked |
Inputs used
| packages | chimeraboost |
| ecosystems | pypi |
| any_deprecated | no |
| min_days_since_publish | 0 |
Engineering Quality
Are baseline engineering and documentation practices in place?
71
Engineering practices
68Moderate
How it's scored
| 24/24 | CI workflows — 2 workflow(s) |
| 24/24 | Tests present |
| 0/16 | Linter config |
| 0/9.6 | Pre-commit hooks |
| 0/6.4 | .editorconfig |
| 20/20 | OpenSSF Scorecard: CI-Tests — 6 out of 6 merged PRs checked by a CI test -- score normalized to 10 |
Inputs used
| has_ci | yes |
| has_tests | yes |
| has_editorconfig | no |
| has_linter_config | no |
| has_precommit_config | no |
Documentation
75Good
How it's scored
| 30/30 | README |
| 25/25 | Documentation directory |
| 0/15 | Documentation / homepage site |
| 10/10 | Repository description |
| 0/10 | Topics |
| 10/10 | Wiki |
Inputs used
| topics | — |
| has_wiki | yes |
| homepage | — |
| has_readme | yes |
| has_docs_dir | yes |
| has_description | yes |
Security
Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?
36
Security posture
36At risk
How it's scored
| 7.5/7.5 | Binary-Artifacts — no binaries found in the repo |
| 0/7.5 | Branch-Protection — no data |
| 2.5/2.5 | CI-Tests — 6 out of 6 merged PRs checked by a CI test -- score normalized to 10 |
| 0/2.5 | CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected |
| 0/7.5 | Code-Review — Found 0/7 approved changesets -- score normalized to 0 |
| 0.8/2.5 | Contributors — project has 1 contributing companies or organizations -- score normalized to 3 |
| 10/10 | Dangerous-Workflow — no dangerous workflow patterns detected |
| 0/7.5 | Dependency-Update-Tool — no update tool detected |
| 0/5 | Fuzzing — project is not fuzzed |
| 2.5/2.5 | License — license file detected |
| 0/7.5 | Maintained — project was created within the last 90 days. Please review its contents carefully |
| 0/5 | Packaging — no data |
| 0/5 | Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0 |
| 0/5 | SAST — SAST tool is not run on all commits -- score normalized to 0 |
| 0/5 | Security-Policy — security policy file not detected |
| 0/7.5 | Signed-Releases — no data |
| 0/7.5 | Token-Permissions — detected GitHub workflow tokens with excessive permissions |
| 7.5/7.5 | Vulnerabilities — 0 existing vulnerabilities detected |
Inputs used
| source | openssf_scorecard |
| checks_evaluated | 15 |
| scorecard_version | v5.5.0 |
| checks_inconclusive | 3 |
| scorecard_aggregate | 3.6 |
Excluded from scoring (no data or not applicable): branch_protection, packaging, signed_releases. Remaining weights renormalized.
AI Readiness
How well is the repo equipped to be developed and maintained with AI coding agents? An independent, experimental badge — weight 0.0, so it is surfaced on its own and does not affect the overall health score.
52
Agent context & guidance
85Excellent
How it's scored
| 45/45 | Agent instructions — CLAUDE.md |
| 0/15 | Machine-readable docs (llms.txt) |
| 40/40 | Legible commit history — 93 of 99 human commits state their intent (structured subject or explanatory body) |
Inputs used
| has_llms_txt | no |
| legible_history_share | 0.939 |
| agent_instruction_files | CLAUDE.md |
| agent_instruction_max_bytes | 5,476 |
How it's scored
| 0/18 | One-command bootstrap |
| 22/22 | Automated tests |
| 0/11 | Lint / format config |
| 0/11 | Static type checking |
| 0/10 | Reproducible environment |
| 10/10 | Demonstrated agent practice — 85 of the last 100 commits agent-authored or agent-credited |
| 0/8 | Automated maintenance — no automated dependency updates observed |
| 0/10 | OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0 |
Inputs used
| has_nix | no |
| has_tests | yes |
| lockfiles | — |
| has_dockerfile | no |
| typed_language | no |
| bootstrap_files | — |
| has_devcontainer | no |
| has_linter_config | no |
| typecheck_configs | — |
| agent_commit_share | 0.85 |
| toolchain_manifests | — |
| dependency_bot_commit_share | 0 |
Code legibility for models
54Moderate
How it's scored
| 0/45 | Type-checkable code — Python without a type-check config |
| 53.7/55 | Manageable file sizes — 3/125 source files over 60KB |
Inputs used
| primary_language | Python |
| largest_source_bytes | 125,169 |
| source_files_sampled | 125 |
| oversized_source_files | 3 |
Machine-readable interfaces
40At risk
How it's scored
| 0/40 | API schema (OpenAPI/GraphQL/proto) |
| 0/20 | MCP server |
| 40/40 | Runnable examples — examples |
Inputs used
| example_dirs | examples |
| has_mcp_signal | no |
| api_schema_files | — |
Key facts
7GitHub stars
1contributors
367commits, last 12 months
0days since last push
14releases
1bus factor
1open issues
PyPIpackage ecosystems
Data collection warnings
- Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
- GitHub dependency-graph SBOM unavailable (404); the dependency graph may be disabled for this repository
- deps.dev does not index pypi:chimeraboost@0.25.0; advisories assessed against the repository dependency graph instead
More detail
OpenSSF Scorecard 3.6 / 10
3.6aggregate
Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).
| 10 | Binary-Artifacts | no binaries found in the repo |
| n/a | Branch-Protection | internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md |
| 10 | CI-Tests | 6 out of 6 merged PRs checked by a CI test -- score normalized to 10 |
| 0 | CII-Best-Practices | no effort to earn an OpenSSF best practices badge detected |
| 0 | Code-Review | Found 0/7 approved changesets -- score normalized to 0 |
| 3 | Contributors | project has 1 contributing companies or organizations -- score normalized to 3 |
| 10 | Dangerous-Workflow | no dangerous workflow patterns detected |
| 0 | Dependency-Update-Tool | no update tool detected |
| 0 | Fuzzing | project is not fuzzed |
| 10 | License | license file detected |
| 0 | Maintained | project was created within the last 90 days. Please review its contents carefully |
| n/a | Packaging | packaging workflow not detected |
| 0 | Pinned-Dependencies | dependency not pinned by hash detected -- score normalized to 0 |
| 0 | SAST | SAST tool is not run on all commits -- score normalized to 0 |
| 0 | Security-Policy | security policy file not detected |
| n/a | Signed-Releases | no releases found |
| 0 | Token-Permissions | detected GitHub workflow tokens with excessive permissions |
| 10 | Vulnerabilities | 0 existing vulnerabilities detected |
Direct dependencies 4
| Registry | Package | Version constraint | Manifest |
|---|---|---|---|
| PyPI | numpy | >=1.22 | pyproject.toml |
| PyPI | numba | >=0.57 | pyproject.toml |
| PyPI | scikit-learn | >=1.0 | pyproject.toml |
| PyPI | scipy | >=1.7 | pyproject.toml |
All dependencies not collected
The resolved dependency set could not be collected for this report: GitHub dependency-graph SBOM unavailable (404); the dependency graph may be disabled for this repository
Raw JSON report machine-readable
{
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"created_at": "2026-05-26T15:05:32Z",
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"updated_at": "2026-07-26T16:37:42Z",
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"activity": {
"releases": [
{
"tag": "v0.24.0",
"kind": "minor",
"published_at": "2026-07-24T16:21:51Z"
},
{
"tag": "v0.23.0",
"kind": "minor",
"published_at": "2026-07-24T01:06:38Z"
},
{
"tag": "v0.22.0",
"kind": "minor",
"published_at": "2026-07-24T00:33:22Z"
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"tag": "v0.21.0",
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"tag": "v0.20.0",
"kind": "minor",
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{
"tag": "v0.19.0",
"kind": "minor",
"published_at": "2026-07-20T23:33:14Z"
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{
"tag": "v0.18.1",
"kind": "patch",
"published_at": "2026-07-20T11:44:20Z"
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{
"tag": "v0.18.0",
"kind": "minor",
"published_at": "2026-07-18T19:00:45Z"
},
{
"tag": "v0.17.0",
"kind": "minor",
"published_at": "2026-07-18T01:19:25Z"
},
{
"tag": "v0.16.1",
"kind": "patch",
"published_at": "2026-07-17T20:14:37Z"
},
{
"tag": "v0.16.0",
"kind": "minor",
"published_at": "2026-07-17T18:42:29Z"
},
{
"tag": "v0.15.0",
"kind": "minor",
"published_at": "2026-07-16T21:01:29Z"
},
{
"tag": "v0.14.2",
"kind": "patch",
"published_at": "2026-07-14T00:46:31Z"
},
{
"tag": "v0.13.0",
"kind": "minor",
"published_at": "2026-06-16T01:45:21Z"
}
],
"recent_commits": [
{
"oid": "566573aa6c87bb8416be14b148699c26ef358423",
"body": "Docs + TabArena chart refresh (README fix needed before the 0.25.0 PyPI release)",
"is_bot": false,
"headline": "Merge pull request #33 from bbstats/worktree-pareto-left-selection",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-26T16:37:21Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "8b5dd833aa9c109bfe59707e3f86ca6a312fb74f",
"body": "\"Lightning fast, near-CatBoost quality, all in Python\" (CatBoost\ncapitalised as the product name; his words otherwise).\n\nAlso the more defensible claim of the two: on the sealed TabArena holdout\nCatBoost still leads on Elo (1348 vs 1279), and our head-to-head win over\nit is on Grinsztajn, a suite we\n[…]\netter than CatBoost\" was only true on the development\nsuite.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "README headline: Nathan's wording",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-26T16:34:00Z",
"body_truncated": true,
"is_coding_agent": true
},
{
"oid": "3abed833f1d926dbc6954f04ffb97fe0fbc2d08e",
"body": "Nathan's call -- two ChimeraBoost points read as clutter. Chart is back to\none point per method, identical in layout to the pre-fast-rung version.\n\nThe fast rung's measurement is not thrown away: its run, leaderboard entry\nand scripts stay (benchmarks/tabarena/run_chimera_fast.py, 1243 Elo, rank\n36/\n[…]\nhe row. Nothing needs re-running if we ever want it charted.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "TabArena chart: back to the single default point",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-26T16:12:45Z",
"body_truncated": true,
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},
{
"oid": "0853de55b01e2c41db288ebbfbf198eebb1b1378",
"body": "…ethod\n\nNathan asked to see the non-ensembled rungs on the TabArena chart. Only\nTWO of the three are distinguishable there, and that was worth checking\nbefore spending the compute: TabArena runs bagged and hands every child\nan explicit eval_set, and refit_full is a no-op whenever one is supplied,\nso\n[…]\nendered as spaces.\n\nReport-only, per the sealed-holdout vow.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "TabArena-Lite: add the fast rung (quality=1) as its own leaderboard m…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-26T15:04:49Z",
"body_truncated": true,
"is_coding_agent": true
},
{
"oid": "2ef57f48b784b801ed15b77b337ef0c8ba7bbdec",
"body": "Fresh 51-task Lite re-read (51/51 fitted) against the current code: A1\nvector-leaf multiclass plus the quality ladder and refit_full-by-default.\nWhole pool re-read from the regenerated leaderboard, since Elo is\nrelative.\n\nReport-only, per the sealed-holdout vow; aggregate Elo and rank only.\n\n Chime\n[…]\narena_out/chimera_pre_select_0250 for the\nbefore/after diff.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "Refresh TabArena-Lite chart on the 0.25.0 line (Elo 1279, rank 31/68)",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-26T05:15:03Z",
"body_truncated": true,
"is_coding_agent": true
},
{
"oid": "278cfdd6dd71f97abbdf8c2007bed05ad530b60c",
"body": "images/pareto.png was already regenerated from the ladder co-run, but two\nplaces still transcribed the 2026-07-18 five-arm run (default 55.7% @\n5.1x) -- stale even before the default flip:\n\n- docs/PROJECT_STATUS.md \"Current standing\" now carries the full ladder\n from results/20260725-213827.json, m\n[…]\ned in 0.24.0; it was executed to\nconfirm it runs as written.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "Propagate the new default through the Pareto text surfaces",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-26T04:34:11Z",
"body_truncated": true,
"is_coding_agent": true
},
{
"oid": "716d235d0ab8c244ae7f9a62739bdd58821d1832",
"body": "quality=1..5 ladder + refit_full default: ChimeraBoost owns the whole Pareto frontier",
"is_bot": false,
"headline": "Merge pull request #32 from bbstats/worktree-pareto-left-selection",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-26T04:29:05Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "00fef2f26c6655c5189ffb6c19cd59da1c35ed99",
"body": "Nathan's call: the default should be whichever rung has the best accuracy\nwithout ensembling. That is rung 3 -- 69.9% of head-to-head matchups won\nagainst rung 2's 45.6%.\n\nRe-charted so the arm labelled ChimeraBoost IS the default\n(results/20260725-213827.json): Ens8 94.0% @ 25.66x, Ens5 83.7% @ 17.\n[…]\nt changes every ordinary fit -- a pre-existing coverage gap.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "Default to rung 3: refit_full=True, the strongest non-bagged setting",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-26T04:19:34Z",
"body_truncated": true,
"is_coding_agent": true
},
{
"oid": "5136b19096fda66b88248154247313bed24374f8",
"body": "Ladder co-run (results/20260725-155127.json, Grinsztajn, 3 seeds, every\nrung in ONE run so the column is comparable) puts all five rungs on the\nPareto frontier: 31.1% @ 1.95x, 45.6% @ 5.22x, 69.9% @ 9.15x, 83.7% @\n17.07x, 94.0% @ 24.74x. LightGBM holds only the extreme-left corner at\n21.6% @ 1.14x; \n[…]\nand winrate_matrix.png from the ladder run.\n599 tests green.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "SELECT closed: five-rung ladder charted, quality shipped, docs",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-25T20:21:15Z",
"body_truncated": true,
"is_coding_agent": true
},
{
"oid": "2d1c66d7aa9a0199e42265a386a82ed89c8853fa",
"body": "A user-facing ladder over the frontier the SELECT program measured. Each\nrung only pins parameters that already exist -- nothing new is computed\n-- so quality=None (the default) leaves every path byte-identical, and\nquality=2 is the shipped defaults exactly. Both verified by test.\n\n 1 fast lin\n[…]\n69 existing tests green (goldens included) plus 30 new ones.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "quality=1..5: named operating points on the strength/slowdown Pareto",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-25T19:51:40Z",
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"oid": "cf796dfdb7bf7cbf1614c0fe34da9edc9ddacb55",
"body": "…y bar\n\nGrinsztajn, 3 seeds, 57 datasets scored head-to-head, all arms in one run\nagainst an identical field (no Ens8, as registered -- so absolute win\nrates are not comparable to the charted 55.7%).\n\nChimeraBoostOneLin -- one booster fit, no selection, linear leaves pinned\non -- reaches 52.0% win r\n[…]\nent); the bars are pure inequalities, so no verdict\nchanged.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "SELECT Phase 0: the 1x-5x Pareto gap is reachable; OneLin clears ever…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-25T19:20:48Z",
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"oid": "a4bd419dbfb25140522565537cf3c78f671fda9f",
"body": "Reuses make_pareto.score_models so the win rates and slowdowns the bars\nare judged on are exactly the ones the chart would draw, and reports the\nfrontier membership alongside. Bar C is deliberately not reimplemented --\ncompare_runs.py already does paired sign tests with the near-solved\nguard, and ac\n[…]\nth --model / --model-new to\ncompare two arms within one run.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "select_read: chord test for the SELECT bars",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-25T19:08:24Z",
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"oid": "b57e99ac510ec28991a1e7cd6dedb2fa14864022",
"body": "…arms\n\nThe charted Pareto has nothing between LightGBM (1.0x) and ChimeraBoost\n(4.9x). The cost structure suggests why that gap should be reachable: a\ndefault regression fit runs up to four boosters (two capped auditions, a\ncross-augmented candidate, and a from-scratch refit of the winner when\ncross\n[…]\nday kill clause.\n\nBenchmarks-only; the library is untouched.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01QL8dKTqwRwQj3j8yJSJVw3",
"is_bot": false,
"headline": "SELECT_PLAN: pre-registered selection-economics probe + fixed-config …",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-25T19:07:25Z",
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"oid": "0ba0f109ffc182511307bfaed934ee85be65b5d8",
"body": "Fix compare_runs' near-solved mean (+ A2 Phase 0 record)",
"is_bot": false,
"headline": "Merge pull request #31 from bbstats/worktree-a2-config-portfolio",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-25T18:54:19Z",
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{
"oid": "44a46c4a7fa579f8b3a8ed5766284a13cab5ffd2",
"body": "compare_runs is the tool every /experiment ship decision runs through, and\nthe ship rule is \"decisive sign test + MEAN improvement on Grinsztajn AND a\nnon-negative OpenML gate\" -- so the mean is load-bearing. It had no\nnear-solved guard at all, while summarize.py and make_tables.py both do.\n\nDemonst\n[…]\nsts/test_compare_runs.py pins the contracts. 569 tests pass.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_018u2u5K96eQ8aamSM5j6tsu",
"is_bot": false,
"headline": "Fix compare_runs' mean: exclude near-solved datasets, report median",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-25T17:25:26Z",
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"oid": "e180960f4d753be76a49b475b7bce6e74a571b28",
"body": "156 fits (13 PMLB tune sets x 3 seeds x 4 configs), no library change.\n\nMeasurement guard: pm:tune/nursery is solved to numerical zero (Brier\n~1e-49 for every config) and manufactured a -8e21% mean delta on the first\npass. Dropped by summarize.py's own near-solved convention, leaving 36 of\n39 cells.\n[…]\nn, high-card, the OpenML gate and TabArena were not touched.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_018u2u5K96eQ8aamSM5j6tsu",
"is_bot": false,
"headline": "A2 Phase 0: pre-registered portfolio KILLED on cost; depth race survives",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-25T17:05:09Z",
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{
"oid": "1a751112fd34835763b2e49671f81ca772f5a4d2",
"body": "Pre-registration before any result was read: design, portfolio, kill bars\nA-D, and stated predictions. Phase 0 measures per-dataset config headroom\nand simulates the capped race offline from recorded validation curves.\n\nProtocol call: Phase 0 runs on the PMLB TUNING fold only. A2 is a\nhyperparameter\n[…]\necision suites, the OpenML gate and TabArena stay untouched.\n\nCo-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_018u2u5K96eQ8aamSM5j6tsu",
"is_bot": false,
"headline": "A2_PLAN: pre-registered config-portfolio audition + Phase 0 tooling",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-25T16:58:00Z",
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"oid": "b4cff091d285dd1ef1ee097647b5186f6182f785",
"body": "A1: vector-leaf multiclass with sketched split scoring",
"is_bot": false,
"headline": "Merge pull request #30 from bbstats/a1-vector-leaf",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T19:22:06Z",
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{
"oid": "bc78349c7d555a19c994d31a6f0b9a7e9d511d59",
"body": "…dict\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_016xhoePdEMTMgJkSh93CzP6",
"is_bot": false,
"headline": "A1 SHIP: gate 10W-0L, goldens re-blessed, CHANGELOG + docs + plan ver…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T19:09:10Z",
"body_truncated": false,
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},
{
"oid": "b55756f55a45b368a44373254eb319a85657a380",
"body": "Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_016xhoePdEMTMgJkSh93CzP6",
"is_bot": false,
"headline": "A1 hc 6-seed extension PASS on pre-stated instrument",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T18:59:12Z",
"body_truncated": false,
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{
"oid": "83b2e057c860cb126bfb71ed1641643a6a648036",
"body": "Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_016xhoePdEMTMgJkSh93CzP6",
"is_bot": false,
"headline": "A1 tier-2 hc read + pre-stated 6-seed extension on the 4 mc sets",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T18:56:18Z",
"body_truncated": false,
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},
{
"oid": "346e0dd3ef75e933fd927fc1eb0948edd46f518e",
"body": "…%, fit 2.5x faster\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_016xhoePdEMTMgJkSh93CzP6",
"is_bot": false,
"headline": "A1 tier-1 screen PASS: identity 102/102, F1 parity, Brier 23W-8L +5.0…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T18:39:58Z",
"body_truncated": false,
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{
"oid": "109e99e2bbad1322c1d6efd192d7a82c0474ba1f",
"body": "…oring\n\nOne tree per round with K-vector Newton leaves replaces K trees per round.\nSplit search runs on a 1-d centered Rademacher projection of the gradient\ncolumns (scalar split kernels, quantized path included, reused verbatim);\nprojected curvature hess@r^2 keeps min_child_weight/l2 semantics stab\n[…]\nkles. Goldens for multiclass panel sets re-bless at\nship per A1_PLAN.md.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_016xhoePdEMTMgJkSh93CzP6",
"is_bot": false,
"headline": "A1: vector-leaf multiclass with centered-Rademacher sketched split sc…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T18:36:33Z",
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{
"oid": "a7340872235bccb3d82e6e8bfa0d149e771a845d",
"body": "…multiclass\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_016xhoePdEMTMgJkSh93CzP6",
"is_bot": false,
"headline": "A1_PLAN: pre-registered design/predictions/kill bars for vector-leaf …",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T18:24:35Z",
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{
"oid": "fe859f44242242d5559f2292e1ae1bb3e546d3bd",
"body": "refit_full: opt-in full-data refit of the ES winner (all /experiment gates PASS)",
"is_bot": false,
"headline": "Merge pull request #29 from bbstats/lre-cheap-ensemble",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T17:39:21Z",
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{
"oid": "b3474fa690b530d3a817b293eec3517d6c4b6b6c",
"body": "… verdict\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01Jf5H6AVHQx1FeMHjECDCFy",
"is_bot": false,
"headline": "refit_full stays opt-in per Nathan: docs (parameters + recipes), plan…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T17:37:19Z",
"body_truncated": false,
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},
{
"oid": "a0a7abc0ee3dd162fa1870486c77ec5925059ec0",
"body": "Tier 1 synth 95W-39L +1.02%; Grinsztajn 48W-11L +2.00% (Brier 18W-5L\n+2.43%); hc 10W-3L-1T +0.57% (Brier 8W-0L); OpenML one-shot 26W-8L-2T\n+1.27%. Spliced headline: single win rate 55.7->73.7% (external field\n93.0%), CatBoost 50.9->43.4, fit x1.98. Default stays False pending\nspeed sign-off.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01Jf5H6AVHQx1FeMHjECDCFy",
"is_bot": false,
"headline": "REFIT_PLAN results: all gates PASS; CHANGELOG [Unreleased] refit_full",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T17:14:40Z",
"body_truncated": false,
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{
"oid": "619bd19946a34003fd8cdb180847c47dad43d38c",
"body": "…t probes\n\n- refit_full param on both estimators: after the auto ES split has chosen\n the budget (selection/calibration done), retrain the winner on 100% of\n rows, rounds scaled by the train-size ratio, lr pinned; temperature/CQR\n transfer; explicit eval_set / early_stopping=False / quantile / ba\n[…]\ntructural diversity).\n- --chimera-refit-full harness flag; 10 new tests.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01Jf5H6AVHQx1FeMHjECDCFy",
"is_bot": false,
"headline": "refit_full: full-data refit of the ES winner (default off) + LRE/refi…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T16:53:41Z",
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{
"oid": "52d0aae8c645589783c2f6cb5c99860091348f21",
"body": "…Poisson/Gamma/Tweedie)\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01Jf5H6AVHQx1FeMHjECDCFy",
"is_bot": false,
"headline": "Release 0.24.0 (custom objectives + eval_metric hook; built-in Huber/…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T16:17:31Z",
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{
"oid": "377deb80ab97e315bccd44b8072fdb4740624f38",
"body": "Custom objectives + eval_metric hook; built-in Huber/Poisson/Gamma/Tweedie",
"is_bot": false,
"headline": "Merge pull request #28 from bbstats/worktree-custom-objectives",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T16:14:34Z",
"body_truncated": false,
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{
"oid": "60cc982fff596a6f09dee4f2fd307a7b195351f1",
"body": "…eedie\n\nPhase 3 backlog top pick (custom objective + eval_metric hook, which\nunlocks the classic extra regression losses for free):\n\n- Regressor loss accepts a user objective instance (subclass\n chimeraboost.CustomObjective: grad_hess + eval, optional init/transform).\n Non-string losses bypass the\n[…]\n-identity goldens and a custom-objective-vs-builtin exact-equality\ntest.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01Jf5H6AVHQx1FeMHjECDCFy",
"is_bot": false,
"headline": "Custom objectives + eval_metric hook; built-in Huber/Poisson/Gamma/Tw…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T01:41:14Z",
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{
"oid": "4e36a660684faa7567edcf6e41e1c8fc4a16a4ab",
"body": "…tical, ChimB 1278 rank 31/68; predict 0.162->0.125 s/1K)\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01WD2LMMYqx1nyxxE7pKRcUv",
"is_bot": false,
"headline": "Refresh TabArena pareto (post-0.23.0 Lite re-read: Elo pool byte-iden…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T01:22:50Z",
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{
"oid": "6667843b8970454b0f582ffd1ab2be033989c578",
"body": "…plit, serial predict twins, cross prealloc)\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01WD2LMMYqx1nyxxE7pKRcUv",
"is_bot": false,
"headline": "Release 0.23.0 (PR #27 follow-ups: pair-code combos, seeded grouped s…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T01:05:31Z",
"body_truncated": false,
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},
{
"oid": "8dbe852fa39c1a03127cec488f556c77aa8e3370",
"body": "…hanged, ChimB 4.9x / Ens8 23.6x)\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01RSMP6TRSv1WzFBjcRnvTJs",
"is_bot": false,
"headline": "Refresh pareto charts (post-0.22.0 run 20260723-192007; win rates unc…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T00:32:20Z",
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{
"oid": "d25da33d353d3f939fb428d29f0ca1f2f2afcb2a",
"body": "Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01RSMP6TRSv1WzFBjcRnvTJs",
"is_bot": false,
"headline": "Release 0.22.0 (version bump; artifact built at 6bbda8c, tagged v0.22.0)",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T00:32:20Z",
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{
"oid": "5fd76b8683dd49bc1ee829cfcd26ec48022a4c88",
"body": "Audit backlog: pair-code combos, grouped-split random_state, serial predict twins",
"is_bot": false,
"headline": "Merge pull request #27 from bbstats/backlog-semibug-followups",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-24T00:30:57Z",
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{
"oid": "979b62a86bb1d783c63630b12e518e68f0e36664",
"body": "…ial predict twins, cross prealloc\n\nRemaining items from the 2026-07-23 semi-bug audit (525 tests incl.\nidentity goldens green):\n\n- Combo categoricals are (val_a, val_b) pairs, not \"_x_\" strings: fixes\n delimiter-collision aliasing, NaN-vs-\"nan\" conflation, int/float\n spelling splits. Identical gr\n[…]\ny.\n- Bool columns no longer misnamed in the cat_features error guidance.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01RSMP6TRSv1WzFBjcRnvTJs",
"is_bot": false,
"headline": "Backlog follow-ups: pair-code combos, grouped-split random_state, ser…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-23T23:42:35Z",
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{
"oid": "7951d6d717ca2371e240045133e6546e934efe8c",
"body": "Predict/fit semi-bug fixes: cross-block cast reuse, single predict conversion, MAE lei guard, depth-0 truncation",
"is_bot": false,
"headline": "Merge pull request #26 from bbstats/predict-fit-semibug-fixes",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-23T23:05:14Z",
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{
"oid": "2a8be66e3833d4837109c1ff4e6ff0141384db3a",
"body": "…, MAE lei guard, depth-0 truncation\n\nAudit follow-up to the 0.21.0 categorical-predict findings. All changes are\nbit-identical on default paths (519 tests incl. identity goldens green).\n\nPerf (bit-identical):\n- _cross_block reads numeric parents from the transform's numeric block:\n one float64 cas\n[…]\nt validation prefix like every\n other exit (scalar + multiclass loops).\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01RSMP6TRSv1WzFBjcRnvTJs",
"is_bot": false,
"headline": "Predict/fit semi-bug fixes: cross-block cast reuse, single conversion…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-23T22:57:46Z",
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{
"oid": "26fed8a715fe172518472f4fec1a663492db6f61",
"body": "Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_018V1LjsaDPtHhjvMCbAKkKw",
"is_bot": false,
"headline": "Release 0.21.0",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-22T19:56:07Z",
"body_truncated": false,
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{
"oid": "b2139dca2215ffd01af3d9199af0cc1ca2c69dd0",
"body": "Drop pandas dependency; share categorical transform across bagged members at predict",
"is_bot": false,
"headline": "Merge pull request #25 from bbstats/bagged-cat-predict",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-22T19:53:16Z",
"body_truncated": false,
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{
"oid": "827d67f12c4339583d6a9fb426d407b92e072ebb",
"body": "…predict\n\nThe categorical machinery is now numpy/numba only, bit-identical to the\npandas implementation (the gdiff group sums replicate pandas' Kahan-\ncompensated groupby exactly; verified bitwise across reg/binary/multiclass\nx single/bagged x weighted x DataFrame/ndarray, incl. fit matrices and\ngdi\n[…]\n 513 + 4 new\ntests green, incl. a pandas-import-blocked end-to-end test.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_018V1LjsaDPtHhjvMCbAKkKw",
"is_bot": false,
"headline": "Drop pandas dependency; share cat transform across bagged members at …",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-22T19:43:53Z",
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"oid": "852481bb9cc99c03ac182a4feb00274784eadbed",
"body": "…pped)\n\nA parallel n_ensembles fit divides the thread budget across workers, but\nmembers kept the budget/K sliver permanently and predict sequentially --\nan 8-member bag walked each forest on 1-2 threads. Bit-identical\npredictions; bagged predict ~3-5x faster (50k rows, K=8: numeric\n0.80->0.24s, categorical 2.31->1.60s).\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Bagged members: restore parent thread_count after fit (predict was ca…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-22T19:02:07Z",
"body_truncated": false,
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{
"oid": "6a76586dfdff90275e7e816f25e35c927b8527fb",
"body": "Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "Pareto charts: linear x-axis (log was overkill; same dimensions)",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-21T02:47:22Z",
"body_truncated": false,
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},
{
"oid": "0a3163a0b33b8933554432d499fc69ffa10025ae",
"body": "…, in-CI), train 0.83 predict 0.162 s/1K\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "TabArena chart: post-0.20.0 Lite re-read — Elo 1264->1278 (rank 31/68…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-21T02:39:42Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "4e1b4e25ab0fd7f75e4f33241bf5f5925f5fda9e",
"body": "… Ens8 23.9x->23.2x\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "Refresh pareto: 0.20.0 field — win rates unchanged, ChimB 5.1x->4.8x,…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-21T02:25:56Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "7d48e053e5bd3c7aded1126871aeb0f1f6b84c46",
"body": "…oss skip\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "Release 0.20.0: group-centered categorical crosses + audition train-l…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-21T02:07:00Z",
"body_truncated": false,
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},
{
"oid": "8c6f1499f90fa8ed07ac2badd892562442aa4bb5",
"body": "Cross features for categorical columns + faster selection fits",
"is_bot": false,
"headline": "Merge pull request #24 from bbstats/worktree-pareto-catcross",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-21T01:56:59Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "301e2f88ad94e429f6d3d3385848a5ef620a5b02",
"body": "Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "CATCROSS: T3 gate flat (non-negative) — SHIP verdict; CHANGELOG + docs",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-21T01:39:45Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "e5ece0324afb0b7bae68aa135b0e587ad772dfb9",
"body": "…wup into +2.53%)\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "CATCROSS: T2 highcard PASS (5W-3L +0.254%, race flipped the probe blo…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-21T01:23:32Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "2040e3c1d758ad00dd08cdc556719f71fb0fbf03",
"body": "…ver passed)\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "CATCROSS: T2 Grinsztajn 59/59 exact ties (structurally inert, cats ne…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-21T01:09:22Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "40542a8a41ec8c3fdac3f286f34881fc0e317963",
"body": "Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "CATCROSS: T1 synth PASS (entity-slice concentration, controls exact)",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-21T00:49:40Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "0b3c312f8377ec88cdbb6bf2a54b923a86a424fe",
"body": "Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "CATCROSS_PLAN: pre-register gdiff predictions, kill clauses, ship bar",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-21T00:00:18Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "e0d401bab9b16041f0323ae923e43dfa413532c3",
"body": "New cross-pair op 'gdiff': a column holding each row's numeric value minus\nits category's fit-time mean, so 'above this row's own category's baseline'\nbecomes one split instead of a per-category staircase (the num x cat analog\nof the 2026-07-13 diff/prod fix). Target-free -- the same fitted map serv\n[…]\nrees. Decision suites pending per /experiment.\n\n513 tests green (9 new).\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "Group-centered categorical crosses (gdiff): x_num - mean(x_num | cat)",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-20T23:58:27Z",
"body_truncated": true,
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},
{
"oid": "a01de47538f079180c84e98e17b684c3dcbf94e5",
"body": "The raced-selection auditions install internal callbacks that never read\ntrain_loss, but the fit loop evaluated the loss on the full training set\nevery round whenever any callback was present. Internal callbacks are now\ntagged _cb_needs_train_loss=False and the loop passes None instead of\npaying the\n[…]\nault\nbinary fit 15.6% faster on a 50k-row A/B (0.959s -> 0.809s median).\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01AphtGuN8Uxr74JZKamikH8",
"is_bot": false,
"headline": "Skip per-round train-loss eval for selection-audition callbacks",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-20T23:48:10Z",
"body_truncated": true,
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},
{
"oid": "919a80a65cc77657aa4c9f8d100227bb61377d84",
"body": "A1 + 0.19.0 release prep: verbose notice for the silent early-stopping holdout",
"is_bot": false,
"headline": "Merge pull request #23 from bbstats/worktree-a1-es-notice",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-20T23:27:08Z",
"body_truncated": false,
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},
{
"oid": "a564bbfc756ce8e774ae1aa21fdad18c7509153a",
"body": "…g holdout\n\nWith verbose=True, fit now prints how many rows early_stopping=True held\nout as the auto validation set (both estimators; bag members stay quiet).\nDefault verbose=False unchanged. Closes the last decided Phase 2 audit\nitem. Bundles the 0.19.0 version bump + CHANGELOG (H1/H2 lei auto\ndefault, H3 weight-aware fixes, this notice).\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01J3G7QxkKLXfh3DinQiMqqk",
"is_bot": false,
"headline": "A1 + release prep 0.19.0: verbose notice for the silent early-stoppin…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-20T23:20:49Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "266f899b657a3b875c5bc1ee02d5ba8c593ad459",
"body": "H3: make sample_weight weight-aware (encoder, binner, early-stopping metric)",
"is_bot": false,
"headline": "Merge pull request #22 from bbstats/worktree-h3-weight-aware",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-20T17:07:30Z",
"body_truncated": false,
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},
{
"oid": "607e70a39397b85cb63b7ad25b234ab5d0580b2d",
"body": null,
"is_bot": true,
"headline": "Merge main: resolve CHANGELOG conflict (H1/H2 + H3 Unreleased entries)",
"author_name": "copilot-swe-agent[bot]",
"author_login": "Copilot",
"committed_at": "2026-07-20T16:51:49Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "0d9804e481f7ff0ee66615496ed9e5b54772b169",
"body": "sample_weight was only applied to the gradient/leaf step. Rows with\nweight 0 still shaped the ordered-target categorical encodings, the\nquantile bin borders, and — most damaging — the early-stopping metric,\nwhich was computed unweighted on the auto-split validation fold. In an\nadversarial repro (zer\n[…]\nion (they use no weights), confirmed by the\nnumerical-identity goldens.\n\nCo-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01C73oLdSQaovFVQzxRkDQzg",
"is_bot": false,
"headline": "H3: make sample_weight weight-aware in encoder, binner, and ES metric",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-20T16:40:47Z",
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},
{
"oid": "0be8d109d6d6c664870ddec959d32e5356cb624c",
"body": "H1/H2: honest leaf_estimation_iterations default (3 → None auto)",
"is_bot": false,
"headline": "Merge pull request #21 from bbstats/worktree-h1h2-lei",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-20T14:41:57Z",
"body_truncated": false,
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},
{
"oid": "a9237cd6dd4fc94970652941590165762a33e47d",
"body": "…, honest warnings\n\nPhase-2 audit follow-up. An A/B across synth, Grinsztajn, highcard and the\nOpenML gate KILLED the hypothesis that clf lei=3 was a stale default:\n- Grinsztajn 59/59 bit-identical (linear leaves fully shadow lei there),\n reg 0-0-48 and multiclass 0-0-34 exact ties on synth, highca\n[…]\nd default and needs its own gate; recorded as a follow-up.\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01DH3g2jgrBetEkUib3xV5By",
"is_bot": false,
"headline": "H1/H2: classifier leaf_estimation_iterations default 3 -> None (auto)…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-20T14:36:39Z",
"body_truncated": true,
"is_coding_agent": true
},
{
"oid": "1b58aa26d1ef2487398723166399937e9260ae72",
"body": "Audit Phase 1 fixes (thread hygiene, pickle slim, loud failures, docs)\nplus the H5 early-stop truncation fix.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01Bpqad7wW42HtzYJz633fwq",
"is_bot": false,
"headline": "Release 0.18.1",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-20T11:41:39Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "9a5a3fd76088eb68244a7cc172d216aeec2091ce",
"body": "Exhausting n_estimators before patience fired kept every tree built past\nthe best round, contradicting the best_iteration_ contract (~5% val RMSE\ncost in the budget-exhausted repro). for/else keeps callback stops (the\nselection auditions) byte-identical; verified synth 136/136 exact ties,\nGrinsztajn\n[…]\nhe only\nexhausted fits, OpenML gate 35/36 ties + one sub-0.005% epsilon.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_01Bpqad7wW42HtzYJz633fwq",
"is_bot": false,
"headline": "H5 fix: truncate to best iteration when the tree budget beats patience",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-20T01:35:32Z",
"body_truncated": true,
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},
{
"oid": "f14be606b641f1bf0dc92bb14b3951f1fe631c6b",
"body": "…ions\n\nCodebase step-back audit (5 parallel review agents + repro'd findings).\nBehavior-neutral fixes only; all fitted models bit-identical (483 tests\nincl. numerical-identity goldens green, 14 new regression tests).\n\nCode:\n- thread_count now applies to predict and the global numba setting is\n rest\n[…]\ny)\n\nGetting-started doctest outputs verified byte-exact on current code.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>\nClaude-Session: https://claude.ai/code/session_014FHt54zCikygcZHP3YpBnn",
"is_bot": false,
"headline": "Audit fixes: thread hygiene, pickle slim, loud failures, docs correct…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-19T15:33:40Z",
"body_truncated": true,
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},
{
"oid": "12dcdcda91035d61c540cf9b309916765ccafb18",
"body": "test_strength_viz imports make_pareto, and CI installs only the library\ndeps (no matplotlib) -> collection error killed the whole suite on every\nPython version (run 29664678946). matplotlib now imports inside the two\nrender_* functions only; scoring/tables/tests need none of it. Verified\nlocally with matplotlib shadow-blocked: 8/8 pass, 469 tests collect.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Fix CI: lazy matplotlib import in make_pareto",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-19T00:00:02Z",
"body_truncated": false,
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},
{
"oid": "97ca6b86b7cb9f7ba110675e350f24e7b183a6ee",
"body": "Per STRENGTH_VIZ_PLAN (Nathan resolved D0 to win percentage). Blended-%\nsaturated at 99.x on near-Bayes-optimal data; win rate (% of dataset x\nopponent matchups won on RMSE reg / Brier clf, ties 1/2, 95% bootstrap CI)\ndecompresses the field: Ens8 98.2 / ChimB 55.7 / CatB 50.9 / LGBM 28.5 /\nHGB 16.7 \n[…]\ndocs/PROJECT_STATUS 2, /pareto skill, CLAUDE.md north-star line updated\n- Ship-gating unchanged: chart legibility only, library source untouched\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Strength-viz shipped: pareto.png headline axis = head-to-head win rate",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-18T23:07:44Z",
"body_truncated": true,
"is_coding_agent": true
},
{
"oid": "00ecb25fe5009f850e46f50a8dde4e45aeb5fd7d",
"body": "Win rate vs the field is mean rank linearly rescaled (winrate =\n(k - mean_rank)/(k - 1), ties half), so the intuitive unit costs nothing.\nOutright-winner share explicitly rejected as the axis (degenerate with\nEns8 in-pool). D1-D3 remain open for the build session.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Strength-viz plan: axis resolved to pairwise win rate per Nathan",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-18T22:37:07Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "d525d335816c1c79b050765636fd003c661ae5a7",
"body": "…bility)\n\nPre-registered plan (no code change). Blended percent-vs-best saturates near\n100 on near-optimal tabular data, so 4 of 5 models smear into a 2-point band.\nRecommends: headline y-axis to mean rank (bootstrap CIs) plus a head-to-head\nwin-rate matrix companion; keep blended as a diagnostic. Per-dataset scores\nalready live in the result JSONs, so it is pure re-analysis with no new runs.\nThree decisions flagged for the build session.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Plan: make the Grinsztajn chart show winner/loser (strength-axis legi…",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-18T22:35:04Z",
"body_truncated": false,
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},
{
"oid": "2044329f91192526d4dbb30b611dfcbf2193e217",
"body": "…flat\n\n51-task Lite re-run (0/51 fail) after quantize_gradients shipped default-on\nin 0.18.0. ChimeraBoost Elo 1267 -> 1264 (-3, inside +-58/60 CI = flat),\nrank 32/68 unchanged; accuracy held after the default flip. Pool re-read\nsame-run (CatBoost 1346->1348, XGB/LGBM/RF/Linear exact). Train 0.79->0\n[…]\n 20-26% fit win\nquantization gives on Grinsztajn/high-card (known Lite property). Still on\nthe frontier. Report-only per the sealed-holdout vow.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "TabArena-Lite chart refresh: 0.18.0 (quantized histograms) Elo 1264, …",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-18T22:26:03Z",
"body_truncated": true,
"is_coding_agent": true
},
{
"oid": "dc74afabe4e22af96d499409b1f9dfa68bdceced",
"body": "Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Release 0.18.0",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-18T18:54:32Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "dfd040011b008ec0804071b8791f855eaa058946",
"body": "Fresh canonical 5-arm gr run 20260718-142950: accuracy columns identical\nto 20260717-153114 to the decimal, competitors unmoved, both Chimera\npoints moved left. Program record closed in QUANT_PLAN.md.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Q-program close: pareto refresh (single 6.4x->5.1x, Ens8 31.0x->23.9x)",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-18T18:47:26Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "a321e60b1831284890dc61fb137851283eac2fdb",
"body": "All registered Phase-3 bars passed (full record benchmarks/QUANT_PLAN.md):\ntier-1 synth flat (28W-33L-75T, +0.006%, canaries exactly 0; Brier flat);\ngr accuracy parity (27W-24L-8T, -0.036%) with fit sum 0.738 (-26.2%);\nhc parity both arms (3-3-8 / Ens8 6-5-3) with fit sums 0.796 / 0.805;\nOpenML gate\n[…]\nrol 0.989.\nGoldens regenerated (behavior change, cross_features precedent);\n461 tests green; quantize_gradients=False restores exact float path.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Q-program SHIP: quantize_gradients default ON; goldens, CHANGELOG, docs",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-18T18:29:19Z",
"body_truncated": true,
"is_coding_agent": true
},
{
"oid": "eeba9ef327f119799c7429d5f9fc05182bd44590",
"body": "Harness A/B mechanics for QUANT_PLAN Phase 3: --chimera-quantize sets\nquantize_gradients=True on every ChimeraBoost arm (single + bagged\nmembers), stamped into the run config line. quant_smoke.py: real\nwrapper-level fits engage the flag end to end — reg 1.22-1.23x fit,\nbin 1.06-1.09x (ridge/calibration untouched by design), metrics ~identical.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Q-program: --chimera-quantize harness flag + wrapper-level smoke",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-18T18:13:04Z",
"body_truncated": false,
"is_coding_agent": true
},
{
"oid": "1fa8120f3ccdb98f9f6acd65d4877ec3c2ce31c9",
"body": "…a flag\n\nQUANT_PLAN.md program (Nathan's FP-drift opt-in, 2026-07-18). Split search\nruns on ~15-bit quantized grad/hess packed one-int64-per-sample (LightGBM-4\n-style): one integer RMW per scatter write, half the histogram footprint.\nLeaf values / ridge / LOO keep exact float grads (leaf renewal for\n[…]\nefault path bit-identical, goldens untouched. Oracle test: bit-exact vs\nfloat kernel on power-of-two-representable data, both dispatch branches.\n\nCo-Authored-By: Claude Fable 5 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Q-program Phase 1: quantized-gradient packed-int64 histograms behind …",
"author_name": "Nathan Walker",
"author_login": "bbstats",
"committed_at": "2026-07-18T18:08:35Z",
"body_truncated": true,
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"oid": "9020b414878d719b442f0eb62e9a7c5ecdbf1b30",
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"inputs": {
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{
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"points": 7.5,
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},
{
"key": "branch_protection",
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"detail": "internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md",
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{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
"key": "maintained",
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"points": 0,
"status": "missed",
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},
{
"key": "packaging",
"name": "Packaging",
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"points": 0,
"status": "excluded",
"details": [
{
"code": "no_data",
"params": {}
}
],
"max_points": 5
},
{
"key": "pinned_dependencies",
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"points": 0,
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},
{
"key": "sast",
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"points": 0,
"status": "missed",
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},
{
"key": "security_policy",
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"points": 0,
"status": "missed",
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},
{
"key": "signed_releases",
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{
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},
{
"key": "vulnerabilities",
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}
]
}
],
"description": "Are visible security and supply-chain practices strong, with no malicious dependency and no unresolved high-risk jurisdiction exposure?"
},
{
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"weight": 0,
"metrics": [
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"note": null,
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"agent_instruction_max_bytes": 5476
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}
}
],
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{
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"points": 0,
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},
{
"key": "legible_commit_history",
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"code": "legible_history",
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"sampled": 99
}
}
],
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}
]
},
{
"key": "ai_verify_loop",
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"note": null,
"notes": [],
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"inputs": {
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},
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{
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"points": 0,
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},
{
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"points": 22,
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},
{
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},
{
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},
{
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"points": 0,
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},
{
"key": "demonstrated_agent_practice",
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}
}
],
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},
{
"key": "automated_maintenance",
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"points": 0,
"status": "missed",
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{
"code": "no_dependency_automation",
"params": {}
}
],
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},
{
"key": "openssf_scorecard_pinned_dependencies",
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}
]
},
{
"key": "ai_code_legibility",
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},
"components": [
{
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"points": 0,
"status": "missed",
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}
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],
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},
{
"key": "manageable_file_sizes",
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"points": 53.7,
"status": "partial",
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}
}
],
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}
]
},
{
"key": "ai_interfaces",
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"name": "Machine-readable interfaces",
"note": null,
"notes": [],
"value": 40,
"inputs": {
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],
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"api_schema_files": []
},
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{
"key": "api_schema_openapi_graphql_proto",
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"points": 0,
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},
{
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"detail": null,
"points": 0,
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},
{
"key": "runnable_examples",
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}
]
}
],
"description": "How well is the repo equipped to be developed and maintained with AI coding agents? An independent, experimental badge — weight 0.0, so it is surfaced on its own and does not affect the overall health score."
}
],
"metrics_version": "1.13.0"
},
"warnings": [
"Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token",
"GitHub dependency-graph SBOM unavailable (404); the dependency graph may be disabled for this repository",
"deps.dev does not index pypi:chimeraboost@0.25.0; advisories assessed against the repository dependency graph instead"
],
"report_type": "repository",
"generated_at": "2026-07-26T16:41:59.574188Z",
"schema_version": "0.27.0",
"badge_url": "https://raw.githubusercontent.com/inspect-software/badges/main/v1/b/bbstats/chimeraboost.svg",
"full_name": "bbstats/chimeraboost",
"license_state": "standard",
"license_spdx": "Apache-2.0"
}Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.
Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v1.13.0, schema v0.27.0 — full methodology · metrics wiki.
How one result sits in the wider record: aggregate statistics — PyPI.