{"adoption": {"forks": 205, "observed_at": "2026-08-28T04:03:13.134578+00:00", "stars": 1011}, "canonical_url": "https://ross.abutalabs.com/products/cityflow", "card": {"archived": false, "artifact_type": "library", "description": "A Multi-Agent Reinforcement Learning Environment for Large Scale City Traffic Scenario", "domain": ["simulation", "reinforcement-learning", "autonomous-vehicles", "machine-learning"], "enriched": true, "function": ["simulation", "machine-learning", "reinforcement-learning", "agent-framework"], "health_score": 43, "homepage": "https://cityflow-project.github.io", "language": "C++", "license": "Apache-2.0", "license_family": "permissive", "maturity": "active", "member_repos": ["cityflow-project/CityFlow"], "name": "cityflow-project/CityFlow", "platform": ["python", "cpp"], "pushed_at": "2025-08-19T21:39:36+00:00", "repo": "cityflow-project/CityFlow", "stars": 1011, "tags": ["traffic-simulation", "traffic-signal-control", "multi-agent-reinforcement-learning", "gym-environment", "transportation", "linux", "macos", "docker"], "topics": ["multiagent-systems", "multiagent-reinforcement-learning", "traffic-simulation", "traffic-signal-control"], "urls": [], "use_cases": ["train reinforcement learning agents for traffic signal control", "simulate city-wide traffic with thousands of vehicles", "benchmark multi-agent RL algorithms on road networks", "compare traffic control policies against SUMO", "build custom road networks and traffic flows for transportation research", "run reproducible traffic simulations for ML experiments"], "what_it_is": "CityFlow is an open-source microscopic traffic simulator designed as a multi-agent reinforcement learning environment for large-scale city traffic scenarios. It provides a fast, multithreaded C++ engine with a Python interface, significantly outperforming SUMO for city-wide traffic signal control research.", "when_to_avoid": ["you need detailed driver behavior modeling or mobility features beyond traffic flow", "you require SUMO's ecosystem of tools, formats, and plugins", "you need a GUI-first traffic planning tool rather than a programmatic RL environment", "your scenario is small-scale where simulation speed is not a concern"], "when_to_choose": ["you need a fast RL environment for large-scale traffic signal control", "SUMO is too slow for your city-scale simulation experiments", "you want a Python-friendly simulator for multi-agent reinforcement learning research", "reproducibility of traffic simulations matters for your work"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/cityflow", "repo": "cityflow-project/CityFlow", "role": "main", "score": 49}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-30T07:11:49.654202+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "bdca7003fd7a1b27366929941124645f6ec3a6e132b6f89006d922e5c4b3a2c6", "fetched_at": "2026-08-28T04:03:13.134578+00:00", "kind": "readme", "missing": false, "url": "https://github.com/cityflow-project/CityFlow"}, {"content_hash": "f1f7ef62f35330965a8b9176f81e137cd09a5c0fbd23b865b2af9a70264e4237", "fetched_at": "2026-08-29T13:11:28.582820+00:00", "kind": "homepage", "missing": false, "url": "https://cityflow-project.github.io"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-30T07:11:49.654202+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "bdca7003fd7a1b27366929941124645f6ec3a6e132b6f89006d922e5c4b3a2c6", "fetched_at": "2026-08-28T04:03:13.134578+00:00", "kind": "readme", "missing": false, "url": "https://github.com/cityflow-project/CityFlow"}, {"content_hash": "f1f7ef62f35330965a8b9176f81e137cd09a5c0fbd23b865b2af9a70264e4237", "fetched_at": "2026-08-29T13:11:28.582820+00:00", "kind": "homepage", "missing": false, "url": "https://cityflow-project.github.io"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-30T07:11:49.654202+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "bdca7003fd7a1b27366929941124645f6ec3a6e132b6f89006d922e5c4b3a2c6", "fetched_at": "2026-08-28T04:03:13.134578+00:00", "kind": "readme", "missing": false, "url": "https://github.com/cityflow-project/CityFlow"}, {"content_hash": "f1f7ef62f35330965a8b9176f81e137cd09a5c0fbd23b865b2af9a70264e4237", "fetched_at": "2026-08-29T13:11:28.582820+00:00", "kind": "homepage", "missing": false, "url": "https://cityflow-project.github.io"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-30T07:11:49.654202+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "bdca7003fd7a1b27366929941124645f6ec3a6e132b6f89006d922e5c4b3a2c6", "fetched_at": "2026-08-28T04:03:13.134578+00:00", "kind": "readme", "missing": false, "url": "https://github.com/cityflow-project/CityFlow"}, {"content_hash": "f1f7ef62f35330965a8b9176f81e137cd09a5c0fbd23b865b2af9a70264e4237", "fetched_at": "2026-08-29T13:11:28.582820+00:00", "kind": "homepage", "missing": false, "url": "https://cityflow-project.github.io"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-30T07:11:49.654202+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "bdca7003fd7a1b27366929941124645f6ec3a6e132b6f89006d922e5c4b3a2c6", "fetched_at": "2026-08-28T04:03:13.134578+00:00", "kind": "readme", "missing": false, "url": "https://github.com/cityflow-project/CityFlow"}, {"content_hash": "f1f7ef62f35330965a8b9176f81e137cd09a5c0fbd23b865b2af9a70264e4237", "fetched_at": "2026-08-29T13:11:28.582820+00:00", "kind": "homepage", "missing": false, "url": "https://cityflow-project.github.io"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-30T07:11:49.654202+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "bdca7003fd7a1b27366929941124645f6ec3a6e132b6f89006d922e5c4b3a2c6", "fetched_at": "2026-08-28T04:03:13.134578+00:00", "kind": "readme", "missing": false, "url": "https://github.com/cityflow-project/CityFlow"}, {"content_hash": "f1f7ef62f35330965a8b9176f81e137cd09a5c0fbd23b865b2af9a70264e4237", "fetched_at": "2026-08-29T13:11:28.582820+00:00", "kind": "homepage", "missing": false, "url": "https://cityflow-project.github.io"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:03:13.134578+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-30T07:11:49.654202+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "bdca7003fd7a1b27366929941124645f6ec3a6e132b6f89006d922e5c4b3a2c6", "fetched_at": "2026-08-28T04:03:13.134578+00:00", "kind": "readme", "missing": false, "url": "https://github.com/cityflow-project/CityFlow"}, {"content_hash": "f1f7ef62f35330965a8b9176f81e137cd09a5c0fbd23b865b2af9a70264e4237", "fetched_at": "2026-08-29T13:11:28.582820+00:00", "kind": "homepage", "missing": false, "url": "https://cityflow-project.github.io"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-30T07:11:49.654202+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "bdca7003fd7a1b27366929941124645f6ec3a6e132b6f89006d922e5c4b3a2c6", "fetched_at": "2026-08-28T04:03:13.134578+00:00", "kind": "readme", "missing": false, "url": "https://github.com/cityflow-project/CityFlow"}, {"content_hash": "f1f7ef62f35330965a8b9176f81e137cd09a5c0fbd23b865b2af9a70264e4237", "fetched_at": "2026-08-29T13:11:28.582820+00:00", "kind": "homepage", "missing": false, "url": "https://cityflow-project.github.io"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-30T07:11:49.654202+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "bdca7003fd7a1b27366929941124645f6ec3a6e132b6f89006d922e5c4b3a2c6", "fetched_at": "2026-08-28T04:03:13.134578+00:00", "kind": "readme", "missing": false, "url": "https://github.com/cityflow-project/CityFlow"}, {"content_hash": "f1f7ef62f35330965a8b9176f81e137cd09a5c0fbd23b865b2af9a70264e4237", "fetched_at": "2026-08-29T13:11:28.582820+00:00", "kind": "homepage", "missing": false, "url": "https://cityflow-project.github.io"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-30T07:11:49.654202+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "bdca7003fd7a1b27366929941124645f6ec3a6e132b6f89006d922e5c4b3a2c6", "fetched_at": "2026-08-28T04:03:13.134578+00:00", "kind": "readme", "missing": false, "url": "https://github.com/cityflow-project/CityFlow"}, {"content_hash": "f1f7ef62f35330965a8b9176f81e137cd09a5c0fbd23b865b2af9a70264e4237", "fetched_at": "2026-08-29T13:11:28.582820+00:00", "kind": "homepage", "missing": false, "url": "https://cityflow-project.github.io"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 37, "longevity": 100, "rhythm": 35}, "computed_at": "2026-09-03T02:20:16.233290+00:00", "flags": ["no_releases"], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 2745, "days_push": 379, "days_rel": null, "gap_med": null, "n_releases_24m": 0}, "score": 49, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}