{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:2QLMMHJGHVBAGECOUN2G6RDCO3","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":"c152498817e1c456b67c2d3e155d409a1e4b92b3a389c2bc6716c1485aa3c768","cross_cats_sorted":["cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2011-01-14T15:19:22Z","title_canon_sha256":"4c6fa2d68806118b843a0d3280edd847216a6f40021e1c439c2127850644d527"},"schema_version":"1.0","source":{"id":"1101.2834","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.2834","created_at":"2026-05-18T04:31:30Z"},{"alias_kind":"arxiv_version","alias_value":"1101.2834v2","created_at":"2026-05-18T04:31:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.2834","created_at":"2026-05-18T04:31:30Z"},{"alias_kind":"pith_short_12","alias_value":"2QLMMHJGHVBA","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"2QLMMHJGHVBAGECO","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"2QLMMHJG","created_at":"2026-05-18T12:26:18Z"}],"graph_snapshots":[{"event_id":"sha256:f83ff21aff4a7d6f280b407a7112fc4942861ffa954fba142c8539c08c0f402b","target":"graph","created_at":"2026-05-18T04:31:30Z","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"},"paper":{"abstract_excerpt":"We present an item-based approach for collaborative filtering. We determine a list of recommended items for a user by considering their previous purchases. Additionally other features of the users could be considered such as page views, search queries, etc... In particular we address the problem of efficiently comparing items. Our algorithm can efficiently approximate an estimate of the similarity between two items. As measure of similarity we use an approximation of the Jaccard similarity that can be computed by constant time operations and one bitwise OR. Moreover we improve the accuracy of ","authors_text":"Calogero Zarba, Fabrizio Caruso, Giovanni Giuffrida","cross_cats":["cs.SI"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2011-01-14T15:19:22Z","title":"Subjective Collaborative Filtering"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.2834","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":"sha256:2145fb631e2536ec56407513cc72dfb052dc9b2f61d00d3a3ac3c1ec70299695","target":"record","created_at":"2026-05-18T04:31:30Z","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":"c152498817e1c456b67c2d3e155d409a1e4b92b3a389c2bc6716c1485aa3c768","cross_cats_sorted":["cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2011-01-14T15:19:22Z","title_canon_sha256":"4c6fa2d68806118b843a0d3280edd847216a6f40021e1c439c2127850644d527"},"schema_version":"1.0","source":{"id":"1101.2834","kind":"arxiv","version":2}},"canonical_sha256":"d416c61d263d4203104ea3746f446276d2b2e547d6373882d657d1accff0e2dd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d416c61d263d4203104ea3746f446276d2b2e547d6373882d657d1accff0e2dd","first_computed_at":"2026-05-18T04:31:30.745909Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:31:30.745909Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gxUR6kQewDbvTTvPEI/xBt8zHzkyE6YjMJDEJvrVSK+mFVq+agisGLRDsDklcTBZy3DaTWofZSfmWc31z9wOAg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:31:30.746386Z","signed_message":"canonical_sha256_bytes"},"source_id":"1101.2834","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2145fb631e2536ec56407513cc72dfb052dc9b2f61d00d3a3ac3c1ec70299695","sha256:f83ff21aff4a7d6f280b407a7112fc4942861ffa954fba142c8539c08c0f402b"],"state_sha256":"196bba76c228e7d3f9508ce2d8f0318ed90467269c4f0899e9be987550b0f385"}