{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:4CEQJJBRD422VK653NCBTVKOQQ","short_pith_number":"pith:4CEQJJBR","canonical_record":{"source":{"id":"2106.15814","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-06-30T05:12:13Z","cross_cats_sorted":[],"title_canon_sha256":"a62f88e62a2fa199f33a908fef08406bb22b1b12d2ace013f6cab9d7439e2272","abstract_canon_sha256":"5abb9b946bc41917899b97ab993f58511a03102760fcdd3c1e669dae9398dc5e"},"schema_version":"1.0"},"canonical_sha256":"e08904a4311f35aaabdddb4419d54e843537fffbb515ed021c4cf455665b9623","source":{"kind":"arxiv","id":"2106.15814","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2106.15814","created_at":"2026-07-05T04:18:15Z"},{"alias_kind":"arxiv_version","alias_value":"2106.15814v2","created_at":"2026-07-05T04:18:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2106.15814","created_at":"2026-07-05T04:18:15Z"},{"alias_kind":"pith_short_12","alias_value":"4CEQJJBRD422","created_at":"2026-07-05T04:18:15Z"},{"alias_kind":"pith_short_16","alias_value":"4CEQJJBRD422VK65","created_at":"2026-07-05T04:18:15Z"},{"alias_kind":"pith_short_8","alias_value":"4CEQJJBR","created_at":"2026-07-05T04:18:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:4CEQJJBRD422VK653NCBTVKOQQ","target":"record","payload":{"canonical_record":{"source":{"id":"2106.15814","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-06-30T05:12:13Z","cross_cats_sorted":[],"title_canon_sha256":"a62f88e62a2fa199f33a908fef08406bb22b1b12d2ace013f6cab9d7439e2272","abstract_canon_sha256":"5abb9b946bc41917899b97ab993f58511a03102760fcdd3c1e669dae9398dc5e"},"schema_version":"1.0"},"canonical_sha256":"e08904a4311f35aaabdddb4419d54e843537fffbb515ed021c4cf455665b9623","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:18:15.091170Z","signature_b64":"M1jHIuJ7vLCx/a0BHJqZm4fCB+i2okFlMMIY2Vmi2MNLOBCv/oMioSXAT9Kh/PZg60D2jhIedlwq0vp+0ujVBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e08904a4311f35aaabdddb4419d54e843537fffbb515ed021c4cf455665b9623","last_reissued_at":"2026-07-05T04:18:15.090767Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:18:15.090767Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2106.15814","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T04:18:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lOzsUF9qY93aqj8pJC37kWA9LG9a8VV7JlSObuYgTXJ0HlhFFdDveId+ZO3jVD4nNuUMDqvtgGmBMjranSUACQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T20:06:12.222946Z"},"content_sha256":"d047d41fb62d17f20a793a39c438384e19cebb7fd9c8f3fc75f9685687756062","schema_version":"1.0","event_id":"sha256:d047d41fb62d17f20a793a39c438384e19cebb7fd9c8f3fc75f9685687756062"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:4CEQJJBRD422VK653NCBTVKOQQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Discovering Collaborative Signals for Next POI Recommendation with Iterative Seq2Graph Augmentation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.IR","authors_text":"Hongzhi Yin, Tong Chen, Yadan Luo, Yang Li, Zi Huang","submitted_at":"2021-06-30T05:12:13Z","abstract_excerpt":"Being an indispensable component in location-based social networks, next point-of-interest (POI) recommendation recommends users unexplored POIs based on their recent visiting histories. However, existing work mainly models check-in data as isolated POI sequences, neglecting the crucial collaborative signals from cross-sequence check-in information. Furthermore, the sparse POI-POI transitions restrict the ability of a model to learn effective sequential patterns for recommendation. In this paper, we propose Sequence-to-Graph (Seq2Graph) augmentation for each POI sequence, allowing collaborativ"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.15814","kind":"arxiv","version":2},"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/2106.15814/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":"2026-07-05T04:18:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LAmGT58SeNlE1iDrHTq3exYeK7wk4+PE/FMIFPBMHbuP29NEct4b6Ly1gMUomoS75y4KdLw+Rk5VpVROur2TDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T20:06:12.223447Z"},"content_sha256":"1f267ba4b7b5852702fab4ffaff48168d0a0277cf9f9d845a4099bff1de818a7","schema_version":"1.0","event_id":"sha256:1f267ba4b7b5852702fab4ffaff48168d0a0277cf9f9d845a4099bff1de818a7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4CEQJJBRD422VK653NCBTVKOQQ/bundle.json","state_url":"https://pith.science/pith/4CEQJJBRD422VK653NCBTVKOQQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4CEQJJBRD422VK653NCBTVKOQQ/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":"2026-08-21T20:06:12Z","links":{"resolver":"https://pith.science/pith/4CEQJJBRD422VK653NCBTVKOQQ","bundle":"https://pith.science/pith/4CEQJJBRD422VK653NCBTVKOQQ/bundle.json","state":"https://pith.science/pith/4CEQJJBRD422VK653NCBTVKOQQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4CEQJJBRD422VK653NCBTVKOQQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:4CEQJJBRD422VK653NCBTVKOQQ","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":"5abb9b946bc41917899b97ab993f58511a03102760fcdd3c1e669dae9398dc5e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-06-30T05:12:13Z","title_canon_sha256":"a62f88e62a2fa199f33a908fef08406bb22b1b12d2ace013f6cab9d7439e2272"},"schema_version":"1.0","source":{"id":"2106.15814","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2106.15814","created_at":"2026-07-05T04:18:15Z"},{"alias_kind":"arxiv_version","alias_value":"2106.15814v2","created_at":"2026-07-05T04:18:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2106.15814","created_at":"2026-07-05T04:18:15Z"},{"alias_kind":"pith_short_12","alias_value":"4CEQJJBRD422","created_at":"2026-07-05T04:18:15Z"},{"alias_kind":"pith_short_16","alias_value":"4CEQJJBRD422VK65","created_at":"2026-07-05T04:18:15Z"},{"alias_kind":"pith_short_8","alias_value":"4CEQJJBR","created_at":"2026-07-05T04:18:15Z"}],"graph_snapshots":[{"event_id":"sha256:1f267ba4b7b5852702fab4ffaff48168d0a0277cf9f9d845a4099bff1de818a7","target":"graph","created_at":"2026-07-05T04:18:15Z","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/2106.15814/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Being an indispensable component in location-based social networks, next point-of-interest (POI) recommendation recommends users unexplored POIs based on their recent visiting histories. However, existing work mainly models check-in data as isolated POI sequences, neglecting the crucial collaborative signals from cross-sequence check-in information. Furthermore, the sparse POI-POI transitions restrict the ability of a model to learn effective sequential patterns for recommendation. In this paper, we propose Sequence-to-Graph (Seq2Graph) augmentation for each POI sequence, allowing collaborativ","authors_text":"Hongzhi Yin, Tong Chen, Yadan Luo, Yang Li, Zi Huang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-06-30T05:12:13Z","title":"Discovering Collaborative Signals for Next POI Recommendation with Iterative Seq2Graph Augmentation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.15814","kind":"arxiv","version":2},"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:d047d41fb62d17f20a793a39c438384e19cebb7fd9c8f3fc75f9685687756062","target":"record","created_at":"2026-07-05T04:18:15Z","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":"5abb9b946bc41917899b97ab993f58511a03102760fcdd3c1e669dae9398dc5e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2021-06-30T05:12:13Z","title_canon_sha256":"a62f88e62a2fa199f33a908fef08406bb22b1b12d2ace013f6cab9d7439e2272"},"schema_version":"1.0","source":{"id":"2106.15814","kind":"arxiv","version":2}},"canonical_sha256":"e08904a4311f35aaabdddb4419d54e843537fffbb515ed021c4cf455665b9623","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e08904a4311f35aaabdddb4419d54e843537fffbb515ed021c4cf455665b9623","first_computed_at":"2026-07-05T04:18:15.090767Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:18:15.090767Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"M1jHIuJ7vLCx/a0BHJqZm4fCB+i2okFlMMIY2Vmi2MNLOBCv/oMioSXAT9Kh/PZg60D2jhIedlwq0vp+0ujVBw==","signature_status":"signed_v1","signed_at":"2026-07-05T04:18:15.091170Z","signed_message":"canonical_sha256_bytes"},"source_id":"2106.15814","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d047d41fb62d17f20a793a39c438384e19cebb7fd9c8f3fc75f9685687756062","sha256:1f267ba4b7b5852702fab4ffaff48168d0a0277cf9f9d845a4099bff1de818a7"],"state_sha256":"00a397b7619d5216e290db36f7d8e9e61c8bb5d23dfbaa09eada9a5a84be2b5c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pvPQZLpWThgZYWHGdvXwhRU9bXyAJtmI38YyyrFXYNUUju+XZ0zGHfcjlhvqW9TnF/+akl5tOp69L2LuHCmqAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-21T20:06:12.228381Z","bundle_sha256":"feb0972f3ffc7afd3e1e96cbd8a63221cb92d77e063234214204c3713ddee193"}}