{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:GNA6RCGOMR2Q276HDGAF6DRZWI","short_pith_number":"pith:GNA6RCGO","canonical_record":{"source":{"id":"2112.01570","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2021-12-02T19:25:38Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"f0d4877a13263cc9d8cd2d2c316aa8805df4347bf79252a4308ed73d7f5dd2b3","abstract_canon_sha256":"a7211f71925e8ee4a91b72fb074eba8742864285dfd64fb6260b339543b0ac34"},"schema_version":"1.0"},"canonical_sha256":"3341e888ce64750d7fc719805f0e39b2116905bce44991a80a6a8df9573b8a9c","source":{"kind":"arxiv","id":"2112.01570","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.01570","created_at":"2026-07-05T03:37:12Z"},{"alias_kind":"arxiv_version","alias_value":"2112.01570v1","created_at":"2026-07-05T03:37:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.01570","created_at":"2026-07-05T03:37:12Z"},{"alias_kind":"pith_short_12","alias_value":"GNA6RCGOMR2Q","created_at":"2026-07-05T03:37:12Z"},{"alias_kind":"pith_short_16","alias_value":"GNA6RCGOMR2Q276H","created_at":"2026-07-05T03:37:12Z"},{"alias_kind":"pith_short_8","alias_value":"GNA6RCGO","created_at":"2026-07-05T03:37:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:GNA6RCGOMR2Q276HDGAF6DRZWI","target":"record","payload":{"canonical_record":{"source":{"id":"2112.01570","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2021-12-02T19:25:38Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"f0d4877a13263cc9d8cd2d2c316aa8805df4347bf79252a4308ed73d7f5dd2b3","abstract_canon_sha256":"a7211f71925e8ee4a91b72fb074eba8742864285dfd64fb6260b339543b0ac34"},"schema_version":"1.0"},"canonical_sha256":"3341e888ce64750d7fc719805f0e39b2116905bce44991a80a6a8df9573b8a9c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:37:12.086542Z","signature_b64":"hfNSqyBX0Z+7qdLLFDZrBDpnitmWnYMIXZPSsb6Zv+6vBRB3lqNryvwliYvSCQcVXvdOq7VrKYB/XvjoXMZbCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3341e888ce64750d7fc719805f0e39b2116905bce44991a80a6a8df9573b8a9c","last_reissued_at":"2026-07-05T03:37:12.086122Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:37:12.086122Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2112.01570","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:37:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3xLAuliMftBxslCjY7PPP4nPDmcMoKONGZYwwiAIa7KxZMm3oobIjZpWp2+55ShAFLvaqDnbZ5zEBaZqzegUCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T21:02:23.877666Z"},"content_sha256":"b6d0b2e6bbaeaa38b3979cce48d8f3b9c2efebf4f203dcd9a6932153d18f3adb","schema_version":"1.0","event_id":"sha256:b6d0b2e6bbaeaa38b3979cce48d8f3b9c2efebf4f203dcd9a6932153d18f3adb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:GNA6RCGOMR2Q276HDGAF6DRZWI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Trajectory Clustering Performance Evaluation: If we know the answer, it's not clustering","license":"http://creativecommons.org/licenses/by-sa/4.0/","headline":"","cross_cats":["cs.AI"],"primary_cat":"cs.LG","authors_text":"Mohsen Rezaie, Nicolas Saunier","submitted_at":"2021-12-02T19:25:38Z","abstract_excerpt":"Advancements in Intelligent Traffic Systems (ITS) have made huge amounts of traffic data available through automatic data collection. A big part of this data is stored as trajectories of moving vehicles and road users. Automatic analysis of this data with minimal human supervision would both lower the costs and eliminate subjectivity of the analysis. Trajectory clustering is an unsupervised task.\n  In this paper, we perform a comprehensive comparison of similarity measures, clustering algorithms and evaluation measures using trajectory data from seven intersections. We also propose a method to"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.01570","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2112.01570/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:37:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Se74gjiwAsYju7c04jT/EkMLLXGTKMymvcKAXUhQiBioRvM+JrXFngEjHamjKazqMp86LCppYkpljQvazDB3Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T21:02:23.877961Z"},"content_sha256":"73719d6323289b35a80f63538c10e570557595bbe6bf3056cf25a71958d153fd","schema_version":"1.0","event_id":"sha256:73719d6323289b35a80f63538c10e570557595bbe6bf3056cf25a71958d153fd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GNA6RCGOMR2Q276HDGAF6DRZWI/bundle.json","state_url":"https://pith.science/pith/GNA6RCGOMR2Q276HDGAF6DRZWI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GNA6RCGOMR2Q276HDGAF6DRZWI/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-31T21:02:23Z","links":{"resolver":"https://pith.science/pith/GNA6RCGOMR2Q276HDGAF6DRZWI","bundle":"https://pith.science/pith/GNA6RCGOMR2Q276HDGAF6DRZWI/bundle.json","state":"https://pith.science/pith/GNA6RCGOMR2Q276HDGAF6DRZWI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GNA6RCGOMR2Q276HDGAF6DRZWI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:GNA6RCGOMR2Q276HDGAF6DRZWI","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"a7211f71925e8ee4a91b72fb074eba8742864285dfd64fb6260b339543b0ac34","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2021-12-02T19:25:38Z","title_canon_sha256":"f0d4877a13263cc9d8cd2d2c316aa8805df4347bf79252a4308ed73d7f5dd2b3"},"schema_version":"1.0","source":{"id":"2112.01570","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.01570","created_at":"2026-07-05T03:37:12Z"},{"alias_kind":"arxiv_version","alias_value":"2112.01570v1","created_at":"2026-07-05T03:37:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.01570","created_at":"2026-07-05T03:37:12Z"},{"alias_kind":"pith_short_12","alias_value":"GNA6RCGOMR2Q","created_at":"2026-07-05T03:37:12Z"},{"alias_kind":"pith_short_16","alias_value":"GNA6RCGOMR2Q276H","created_at":"2026-07-05T03:37:12Z"},{"alias_kind":"pith_short_8","alias_value":"GNA6RCGO","created_at":"2026-07-05T03:37:12Z"}],"graph_snapshots":[{"event_id":"sha256:73719d6323289b35a80f63538c10e570557595bbe6bf3056cf25a71958d153fd","target":"graph","created_at":"2026-07-05T03:37:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2112.01570/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Advancements in Intelligent Traffic Systems (ITS) have made huge amounts of traffic data available through automatic data collection. A big part of this data is stored as trajectories of moving vehicles and road users. Automatic analysis of this data with minimal human supervision would both lower the costs and eliminate subjectivity of the analysis. Trajectory clustering is an unsupervised task.\n  In this paper, we perform a comprehensive comparison of similarity measures, clustering algorithms and evaluation measures using trajectory data from seven intersections. We also propose a method to","authors_text":"Mohsen Rezaie, Nicolas Saunier","cross_cats":["cs.AI"],"headline":"","license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2021-12-02T19:25:38Z","title":"Trajectory Clustering Performance Evaluation: If we know the answer, it's not clustering"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.01570","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:b6d0b2e6bbaeaa38b3979cce48d8f3b9c2efebf4f203dcd9a6932153d18f3adb","target":"record","created_at":"2026-07-05T03:37:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"a7211f71925e8ee4a91b72fb074eba8742864285dfd64fb6260b339543b0ac34","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2021-12-02T19:25:38Z","title_canon_sha256":"f0d4877a13263cc9d8cd2d2c316aa8805df4347bf79252a4308ed73d7f5dd2b3"},"schema_version":"1.0","source":{"id":"2112.01570","kind":"arxiv","version":1}},"canonical_sha256":"3341e888ce64750d7fc719805f0e39b2116905bce44991a80a6a8df9573b8a9c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3341e888ce64750d7fc719805f0e39b2116905bce44991a80a6a8df9573b8a9c","first_computed_at":"2026-07-05T03:37:12.086122Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:37:12.086122Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hfNSqyBX0Z+7qdLLFDZrBDpnitmWnYMIXZPSsb6Zv+6vBRB3lqNryvwliYvSCQcVXvdOq7VrKYB/XvjoXMZbCA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:37:12.086542Z","signed_message":"canonical_sha256_bytes"},"source_id":"2112.01570","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b6d0b2e6bbaeaa38b3979cce48d8f3b9c2efebf4f203dcd9a6932153d18f3adb","sha256:73719d6323289b35a80f63538c10e570557595bbe6bf3056cf25a71958d153fd"],"state_sha256":"9142da39603104b5589cff7d4c15b07afbd315b310977e7e0b8f818e2e5c25d6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8RJm8kWyid5ZpNAAt3YY4oyXZmnNT4MtyxMhK44uR3qSbohJ+KeLRowDh897XE/lCf52Nh7ACVAiTXBvUmmNCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-31T21:02:23.880532Z","bundle_sha256":"855c01a662bd93a684818d5f79bb7e36c9b4e0266de72016c8753fca3de2bac7"}}