{"adoption": {"forks": 83, "observed_at": "2026-09-03T02:15:06.853229+00:00", "stars": 1003}, "canonical_url": "https://ross.abutalabs.com/products/the-little-book-of-ml-metrics", "card": {"archived": false, "artifact_type": "learning-resource", "description": "The book every data scientist needs on their desk.", "domain": ["machine-learning", "data-science", "tutorials", "education"], "enriched": true, "function": ["machine-learning", "data-science", "documentation"], "health_score": 80, "homepage": "https://www.nannyml.com/metrics", "language": "Jupyter Notebook", "license": null, "license_family": "other", "maturity": "active", "member_repos": ["NannyML/The-Little-Book-of-ML-Metrics"], "name": "NannyML/The-Little-Book-of-ML-Metrics", "platform": ["cross-platform"], "pushed_at": "2026-06-04T19:45:13+00:00", "repo": "NannyML/The-Little-Book-of-ML-Metrics", "stars": 1003, "tags": ["book", "ml-metrics", "evaluation-metrics", "reference-handbook", "open-source-book", "jupyter-notebook"], "topics": ["book", "classification-metrics", "clustering-metrics", "computer-vision-metrics", "data-science", "machine-learning", "machine-learning-evaluation", "machine-learning-metrics", "nlp-metrics", "python", "ranking-metrics", "regression-metrics"], "urls": [], "use_cases": ["look up the definition of a regression metric like MAPE", "find the right classification metric for an imbalanced dataset", "learn evaluation metrics for ranking or recommender systems", "understand computer vision metrics like IoU or mAP", "compare NLP and GenAI evaluation metrics", "find metrics for bias and fairness auditing", "quick reference handbook for ML model evaluation"], "what_it_is": "An open-source reference book covering machine learning evaluation metrics across regression, classification, clustering, ranking, computer vision, NLP, GenAI, bias and fairness, and data observability. It is maintained by the NannyML team as a quick-reference handbook for data scientists, with a free digital version and a paid printed edition.", "when_to_avoid": ["you need a software library to compute metrics (use scikit-learn or NannyML instead)", "you need ML model monitoring tooling rather than metric documentation", "you need a formal textbook with exercises rather than a quick-reference handbook"], "when_to_choose": ["you need a concise reference explaining ML evaluation metrics", "you want free, open-source educational material on metrics", "you are a data scientist or ML engineer evaluating models across domains", "you want to contribute to or review an open-source metrics book"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/the-little-book-of-ml-metrics", "repo": "NannyML/The-Little-Book-of-ML-Metrics", "role": "main", "score": 52}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-30T07:13:56.531232+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "0fe2456de675529ab5699967db470f8091e6bcb4157d5ac1bd4e0381ed6b255a", "fetched_at": "2026-09-03T02:15:06.853229+00:00", "kind": "readme", "missing": false, "url": "https://github.com/NannyML/The-Little-Book-of-ML-Metrics"}, {"content_hash": "4b88a0c60e8de708fc9ddc5d663fa597a1fe1914c3728fd671dc5e2415d0a229", "fetched_at": "2026-08-29T13:13:53.801620+00:00", "kind": "homepage", "missing": false, "url": "https://www.nannyml.com/metrics"}, {"content_hash": "f5378d5b2037eae4ee0dae5f9023b08f7771fd3af30a04923b810d6bf901e23c", "fetched_at": "2026-08-29T13:13:53.810778+00:00", "kind": "site_page", "missing": false, "url": "https://docs.nannyml.com/cloud"}, {"content_hash": "cd6e7a7ff0ebf34882e9a77edd8f06a1ed74f5a073b0b8c3b0335d5626994607", "fetched_at": "2026-08-29T13:13:53.814312+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/about"}, {"content_hash": "845caf4e2ae8e8d592bbd735974722939bcb63c865db240491689b31808ba4a2", "fetched_at": "2026-08-29T13:13:53.812625+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/pricing"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-30T07:13:56.531232+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "0fe2456de675529ab5699967db470f8091e6bcb4157d5ac1bd4e0381ed6b255a", "fetched_at": "2026-09-03T02:15:06.853229+00:00", "kind": "readme", "missing": false, "url": "https://github.com/NannyML/The-Little-Book-of-ML-Metrics"}, {"content_hash": "4b88a0c60e8de708fc9ddc5d663fa597a1fe1914c3728fd671dc5e2415d0a229", "fetched_at": "2026-08-29T13:13:53.801620+00:00", "kind": "homepage", "missing": false, "url": "https://www.nannyml.com/metrics"}, {"content_hash": "f5378d5b2037eae4ee0dae5f9023b08f7771fd3af30a04923b810d6bf901e23c", "fetched_at": "2026-08-29T13:13:53.810778+00:00", "kind": "site_page", "missing": false, "url": "https://docs.nannyml.com/cloud"}, {"content_hash": "cd6e7a7ff0ebf34882e9a77edd8f06a1ed74f5a073b0b8c3b0335d5626994607", "fetched_at": "2026-08-29T13:13:53.814312+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/about"}, {"content_hash": "845caf4e2ae8e8d592bbd735974722939bcb63c865db240491689b31808ba4a2", "fetched_at": "2026-08-29T13:13:53.812625+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/pricing"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-30T07:13:56.531232+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "0fe2456de675529ab5699967db470f8091e6bcb4157d5ac1bd4e0381ed6b255a", "fetched_at": "2026-09-03T02:15:06.853229+00:00", "kind": "readme", "missing": false, "url": "https://github.com/NannyML/The-Little-Book-of-ML-Metrics"}, {"content_hash": "4b88a0c60e8de708fc9ddc5d663fa597a1fe1914c3728fd671dc5e2415d0a229", "fetched_at": "2026-08-29T13:13:53.801620+00:00", "kind": "homepage", "missing": false, "url": "https://www.nannyml.com/metrics"}, {"content_hash": "f5378d5b2037eae4ee0dae5f9023b08f7771fd3af30a04923b810d6bf901e23c", "fetched_at": "2026-08-29T13:13:53.810778+00:00", "kind": "site_page", "missing": false, "url": "https://docs.nannyml.com/cloud"}, {"content_hash": "cd6e7a7ff0ebf34882e9a77edd8f06a1ed74f5a073b0b8c3b0335d5626994607", "fetched_at": "2026-08-29T13:13:53.814312+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/about"}, {"content_hash": "845caf4e2ae8e8d592bbd735974722939bcb63c865db240491689b31808ba4a2", "fetched_at": "2026-08-29T13:13:53.812625+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/pricing"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-30T07:13:56.531232+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "0fe2456de675529ab5699967db470f8091e6bcb4157d5ac1bd4e0381ed6b255a", "fetched_at": "2026-09-03T02:15:06.853229+00:00", "kind": "readme", "missing": false, "url": "https://github.com/NannyML/The-Little-Book-of-ML-Metrics"}, {"content_hash": "4b88a0c60e8de708fc9ddc5d663fa597a1fe1914c3728fd671dc5e2415d0a229", "fetched_at": "2026-08-29T13:13:53.801620+00:00", "kind": "homepage", "missing": false, "url": "https://www.nannyml.com/metrics"}, {"content_hash": "f5378d5b2037eae4ee0dae5f9023b08f7771fd3af30a04923b810d6bf901e23c", "fetched_at": "2026-08-29T13:13:53.810778+00:00", "kind": "site_page", "missing": false, "url": "https://docs.nannyml.com/cloud"}, {"content_hash": "cd6e7a7ff0ebf34882e9a77edd8f06a1ed74f5a073b0b8c3b0335d5626994607", "fetched_at": "2026-08-29T13:13:53.814312+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/about"}, {"content_hash": "845caf4e2ae8e8d592bbd735974722939bcb63c865db240491689b31808ba4a2", "fetched_at": "2026-08-29T13:13:53.812625+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/pricing"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-30T07:13:56.531232+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "0fe2456de675529ab5699967db470f8091e6bcb4157d5ac1bd4e0381ed6b255a", "fetched_at": "2026-09-03T02:15:06.853229+00:00", "kind": "readme", "missing": false, "url": "https://github.com/NannyML/The-Little-Book-of-ML-Metrics"}, {"content_hash": "4b88a0c60e8de708fc9ddc5d663fa597a1fe1914c3728fd671dc5e2415d0a229", "fetched_at": "2026-08-29T13:13:53.801620+00:00", "kind": "homepage", "missing": false, "url": "https://www.nannyml.com/metrics"}, {"content_hash": "f5378d5b2037eae4ee0dae5f9023b08f7771fd3af30a04923b810d6bf901e23c", "fetched_at": "2026-08-29T13:13:53.810778+00:00", "kind": "site_page", "missing": false, "url": "https://docs.nannyml.com/cloud"}, {"content_hash": "cd6e7a7ff0ebf34882e9a77edd8f06a1ed74f5a073b0b8c3b0335d5626994607", "fetched_at": "2026-08-29T13:13:53.814312+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/about"}, {"content_hash": "845caf4e2ae8e8d592bbd735974722939bcb63c865db240491689b31808ba4a2", "fetched_at": "2026-08-29T13:13:53.812625+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/pricing"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-30T07:13:56.531232+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "0fe2456de675529ab5699967db470f8091e6bcb4157d5ac1bd4e0381ed6b255a", "fetched_at": "2026-09-03T02:15:06.853229+00:00", "kind": "readme", "missing": false, "url": "https://github.com/NannyML/The-Little-Book-of-ML-Metrics"}, {"content_hash": "4b88a0c60e8de708fc9ddc5d663fa597a1fe1914c3728fd671dc5e2415d0a229", "fetched_at": "2026-08-29T13:13:53.801620+00:00", "kind": "homepage", "missing": false, "url": "https://www.nannyml.com/metrics"}, {"content_hash": "f5378d5b2037eae4ee0dae5f9023b08f7771fd3af30a04923b810d6bf901e23c", "fetched_at": "2026-08-29T13:13:53.810778+00:00", "kind": "site_page", "missing": false, "url": "https://docs.nannyml.com/cloud"}, {"content_hash": "cd6e7a7ff0ebf34882e9a77edd8f06a1ed74f5a073b0b8c3b0335d5626994607", "fetched_at": "2026-08-29T13:13:53.814312+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/about"}, {"content_hash": "845caf4e2ae8e8d592bbd735974722939bcb63c865db240491689b31808ba4a2", "fetched_at": "2026-08-29T13:13:53.812625+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/pricing"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-09-03T02:15:06.853229+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-30T07:13:56.531232+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "0fe2456de675529ab5699967db470f8091e6bcb4157d5ac1bd4e0381ed6b255a", "fetched_at": "2026-09-03T02:15:06.853229+00:00", "kind": "readme", "missing": false, "url": "https://github.com/NannyML/The-Little-Book-of-ML-Metrics"}, {"content_hash": "4b88a0c60e8de708fc9ddc5d663fa597a1fe1914c3728fd671dc5e2415d0a229", "fetched_at": "2026-08-29T13:13:53.801620+00:00", "kind": "homepage", "missing": false, "url": "https://www.nannyml.com/metrics"}, {"content_hash": "f5378d5b2037eae4ee0dae5f9023b08f7771fd3af30a04923b810d6bf901e23c", "fetched_at": "2026-08-29T13:13:53.810778+00:00", "kind": "site_page", "missing": false, "url": "https://docs.nannyml.com/cloud"}, {"content_hash": "cd6e7a7ff0ebf34882e9a77edd8f06a1ed74f5a073b0b8c3b0335d5626994607", "fetched_at": "2026-08-29T13:13:53.814312+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/about"}, {"content_hash": "845caf4e2ae8e8d592bbd735974722939bcb63c865db240491689b31808ba4a2", "fetched_at": "2026-08-29T13:13:53.812625+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/pricing"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-30T07:13:56.531232+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "0fe2456de675529ab5699967db470f8091e6bcb4157d5ac1bd4e0381ed6b255a", "fetched_at": "2026-09-03T02:15:06.853229+00:00", "kind": "readme", "missing": false, "url": "https://github.com/NannyML/The-Little-Book-of-ML-Metrics"}, {"content_hash": "4b88a0c60e8de708fc9ddc5d663fa597a1fe1914c3728fd671dc5e2415d0a229", "fetched_at": "2026-08-29T13:13:53.801620+00:00", "kind": "homepage", "missing": false, "url": "https://www.nannyml.com/metrics"}, {"content_hash": "f5378d5b2037eae4ee0dae5f9023b08f7771fd3af30a04923b810d6bf901e23c", "fetched_at": "2026-08-29T13:13:53.810778+00:00", "kind": "site_page", "missing": false, "url": "https://docs.nannyml.com/cloud"}, {"content_hash": "cd6e7a7ff0ebf34882e9a77edd8f06a1ed74f5a073b0b8c3b0335d5626994607", "fetched_at": "2026-08-29T13:13:53.814312+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/about"}, {"content_hash": "845caf4e2ae8e8d592bbd735974722939bcb63c865db240491689b31808ba4a2", "fetched_at": "2026-08-29T13:13:53.812625+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/pricing"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-30T07:13:56.531232+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "0fe2456de675529ab5699967db470f8091e6bcb4157d5ac1bd4e0381ed6b255a", "fetched_at": "2026-09-03T02:15:06.853229+00:00", "kind": "readme", "missing": false, "url": "https://github.com/NannyML/The-Little-Book-of-ML-Metrics"}, {"content_hash": "4b88a0c60e8de708fc9ddc5d663fa597a1fe1914c3728fd671dc5e2415d0a229", "fetched_at": "2026-08-29T13:13:53.801620+00:00", "kind": "homepage", "missing": false, "url": "https://www.nannyml.com/metrics"}, {"content_hash": "f5378d5b2037eae4ee0dae5f9023b08f7771fd3af30a04923b810d6bf901e23c", "fetched_at": "2026-08-29T13:13:53.810778+00:00", "kind": "site_page", "missing": false, "url": "https://docs.nannyml.com/cloud"}, {"content_hash": "cd6e7a7ff0ebf34882e9a77edd8f06a1ed74f5a073b0b8c3b0335d5626994607", "fetched_at": "2026-08-29T13:13:53.814312+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/about"}, {"content_hash": "845caf4e2ae8e8d592bbd735974722939bcb63c865db240491689b31808ba4a2", "fetched_at": "2026-08-29T13:13:53.812625+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/pricing"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-30T07:13:56.531232+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "0fe2456de675529ab5699967db470f8091e6bcb4157d5ac1bd4e0381ed6b255a", "fetched_at": "2026-09-03T02:15:06.853229+00:00", "kind": "readme", "missing": false, "url": "https://github.com/NannyML/The-Little-Book-of-ML-Metrics"}, {"content_hash": "4b88a0c60e8de708fc9ddc5d663fa597a1fe1914c3728fd671dc5e2415d0a229", "fetched_at": "2026-08-29T13:13:53.801620+00:00", "kind": "homepage", "missing": false, "url": "https://www.nannyml.com/metrics"}, {"content_hash": "f5378d5b2037eae4ee0dae5f9023b08f7771fd3af30a04923b810d6bf901e23c", "fetched_at": "2026-08-29T13:13:53.810778+00:00", "kind": "site_page", "missing": false, "url": "https://docs.nannyml.com/cloud"}, {"content_hash": "cd6e7a7ff0ebf34882e9a77edd8f06a1ed74f5a073b0b8c3b0335d5626994607", "fetched_at": "2026-08-29T13:13:53.814312+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/about"}, {"content_hash": "845caf4e2ae8e8d592bbd735974722939bcb63c865db240491689b31808ba4a2", "fetched_at": "2026-08-29T13:13:53.812625+00:00", "kind": "site_page", "missing": false, "url": "https://www.nannyml.com/pricing"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 85, "longevity": 55, "rhythm": 8}, "computed_at": "2026-09-03T02:20:16.233290+00:00", "flags": ["prerelease_only", "no_license"], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 771, "days_push": 90, "days_rel": 688, "gap_med": null, "n_releases_24m": 1}, "score": 52, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 3, "stale_scrape": false}}