{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:3NYSOKBXPBRJP65QNJBMCKASR3","short_pith_number":"pith:3NYSOKBX","canonical_record":{"source":{"id":"1809.00366","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2018-09-02T16:24:38Z","cross_cats_sorted":["cs.LG","stat.ML"],"title_canon_sha256":"f6a8bfcd5a6d711baf57805334f7ef0e3761839b43995d4eb5479e34efaedfe7","abstract_canon_sha256":"ad2c930fd07bba4fe7239c404c8aba94dfbd2e713b130459bcdd2fe8aa062740"},"schema_version":"1.0"},"canonical_sha256":"db71272837786297fbb06a42c128128ed02e244738c8d456815cdf0bfa84d4f6","source":{"kind":"arxiv","id":"1809.00366","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.00366","created_at":"2026-07-05T00:47:55Z"},{"alias_kind":"arxiv_version","alias_value":"1809.00366v2","created_at":"2026-07-05T00:47:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.00366","created_at":"2026-07-05T00:47:55Z"},{"alias_kind":"pith_short_12","alias_value":"3NYSOKBXPBRJ","created_at":"2026-07-05T00:47:55Z"},{"alias_kind":"pith_short_16","alias_value":"3NYSOKBXPBRJP65Q","created_at":"2026-07-05T00:47:55Z"},{"alias_kind":"pith_short_8","alias_value":"3NYSOKBX","created_at":"2026-07-05T00:47:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:3NYSOKBXPBRJP65QNJBMCKASR3","target":"record","payload":{"canonical_record":{"source":{"id":"1809.00366","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2018-09-02T16:24:38Z","cross_cats_sorted":["cs.LG","stat.ML"],"title_canon_sha256":"f6a8bfcd5a6d711baf57805334f7ef0e3761839b43995d4eb5479e34efaedfe7","abstract_canon_sha256":"ad2c930fd07bba4fe7239c404c8aba94dfbd2e713b130459bcdd2fe8aa062740"},"schema_version":"1.0"},"canonical_sha256":"db71272837786297fbb06a42c128128ed02e244738c8d456815cdf0bfa84d4f6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:47:55.315305Z","signature_b64":"MWTT+Sqg2iPluhA2lUcmAqTI1ESLkgqzys8Pj5O6e1IxjvGsU0QxvLxoLmFjBudCb5RWtAUv1DLpEfke5Dt/CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"db71272837786297fbb06a42c128128ed02e244738c8d456815cdf0bfa84d4f6","last_reissued_at":"2026-07-05T00:47:55.314765Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:47:55.314765Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.00366","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":"2026-07-05T00:47:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GDGi3LEsTGC72cwi0eawnyeefzF0qPZxFD4c0VY9VYYZRUa44oWC4OUlMf/ISAuYPxSraRlyRZ/aMVfg0r0jDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T17:57:32.695324Z"},"content_sha256":"2b7d803c4b14082a1d5d7c5e0c23cef0771c81af25b1ab6591198e607e2e379e","schema_version":"1.0","event_id":"sha256:2b7d803c4b14082a1d5d7c5e0c23cef0771c81af25b1ab6591198e607e2e379e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:3NYSOKBXPBRJP65QNJBMCKASR3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cold-start recommendations in Collective Matrix Factorization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.LG","stat.ML"],"primary_cat":"cs.IR","authors_text":"David Cortes","submitted_at":"2018-09-02T16:24:38Z","abstract_excerpt":"This work explores the ability of collective matrix factorization models in recommender systems to make predictions about users and items for which there is side information available but no feedback or interactions data, and proposes a new formulation with a faster cold-start prediction formula that can be used in real-time systems. While these cold-start recommendations are not as good as warm-start ones, they were found to be of better quality than non-personalized recommendations, and predictions about new users were found to be more reliable than those about new items. The formulation pro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.00366","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/1809.00366/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":"2026-07-05T00:47:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"A5lU5MTTrAtP5+U34jIfS9+JZJhFeEIGJ+7jjADY1mhO3ih0pmCFzSrMjfQmj/3igpe7QEOfMNGiSuvqeC3QBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T17:57:32.696196Z"},"content_sha256":"824a3c0974d6e93a8356d0afe946a96bc8df9cd5a3d6be916b7044db440cd856","schema_version":"1.0","event_id":"sha256:824a3c0974d6e93a8356d0afe946a96bc8df9cd5a3d6be916b7044db440cd856"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3NYSOKBXPBRJP65QNJBMCKASR3/bundle.json","state_url":"https://pith.science/pith/3NYSOKBXPBRJP65QNJBMCKASR3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3NYSOKBXPBRJP65QNJBMCKASR3/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":"2026-08-17T17:57:32Z","links":{"resolver":"https://pith.science/pith/3NYSOKBXPBRJP65QNJBMCKASR3","bundle":"https://pith.science/pith/3NYSOKBXPBRJP65QNJBMCKASR3/bundle.json","state":"https://pith.science/pith/3NYSOKBXPBRJP65QNJBMCKASR3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3NYSOKBXPBRJP65QNJBMCKASR3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:3NYSOKBXPBRJP65QNJBMCKASR3","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":"ad2c930fd07bba4fe7239c404c8aba94dfbd2e713b130459bcdd2fe8aa062740","cross_cats_sorted":["cs.LG","stat.ML"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2018-09-02T16:24:38Z","title_canon_sha256":"f6a8bfcd5a6d711baf57805334f7ef0e3761839b43995d4eb5479e34efaedfe7"},"schema_version":"1.0","source":{"id":"1809.00366","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.00366","created_at":"2026-07-05T00:47:55Z"},{"alias_kind":"arxiv_version","alias_value":"1809.00366v2","created_at":"2026-07-05T00:47:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.00366","created_at":"2026-07-05T00:47:55Z"},{"alias_kind":"pith_short_12","alias_value":"3NYSOKBXPBRJ","created_at":"2026-07-05T00:47:55Z"},{"alias_kind":"pith_short_16","alias_value":"3NYSOKBXPBRJP65Q","created_at":"2026-07-05T00:47:55Z"},{"alias_kind":"pith_short_8","alias_value":"3NYSOKBX","created_at":"2026-07-05T00:47:55Z"}],"graph_snapshots":[{"event_id":"sha256:824a3c0974d6e93a8356d0afe946a96bc8df9cd5a3d6be916b7044db440cd856","target":"graph","created_at":"2026-07-05T00:47:55Z","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/1809.00366/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This work explores the ability of collective matrix factorization models in recommender systems to make predictions about users and items for which there is side information available but no feedback or interactions data, and proposes a new formulation with a faster cold-start prediction formula that can be used in real-time systems. While these cold-start recommendations are not as good as warm-start ones, they were found to be of better quality than non-personalized recommendations, and predictions about new users were found to be more reliable than those about new items. The formulation pro","authors_text":"David Cortes","cross_cats":["cs.LG","stat.ML"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2018-09-02T16:24:38Z","title":"Cold-start recommendations in Collective Matrix Factorization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.00366","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":"sha256:2b7d803c4b14082a1d5d7c5e0c23cef0771c81af25b1ab6591198e607e2e379e","target":"record","created_at":"2026-07-05T00:47:55Z","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":"ad2c930fd07bba4fe7239c404c8aba94dfbd2e713b130459bcdd2fe8aa062740","cross_cats_sorted":["cs.LG","stat.ML"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2018-09-02T16:24:38Z","title_canon_sha256":"f6a8bfcd5a6d711baf57805334f7ef0e3761839b43995d4eb5479e34efaedfe7"},"schema_version":"1.0","source":{"id":"1809.00366","kind":"arxiv","version":2}},"canonical_sha256":"db71272837786297fbb06a42c128128ed02e244738c8d456815cdf0bfa84d4f6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"db71272837786297fbb06a42c128128ed02e244738c8d456815cdf0bfa84d4f6","first_computed_at":"2026-07-05T00:47:55.314765Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:47:55.314765Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MWTT+Sqg2iPluhA2lUcmAqTI1ESLkgqzys8Pj5O6e1IxjvGsU0QxvLxoLmFjBudCb5RWtAUv1DLpEfke5Dt/CA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:47:55.315305Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.00366","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2b7d803c4b14082a1d5d7c5e0c23cef0771c81af25b1ab6591198e607e2e379e","sha256:824a3c0974d6e93a8356d0afe946a96bc8df9cd5a3d6be916b7044db440cd856"],"state_sha256":"b1f801fce147a6737d5fa55dc17446aa5b11c0a0da4cfd8a6affe2afaed97850"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c7PfZXuCV9wKpfsgc7Boj8u/a0kaOW613HhdOAWCKG7PO1WQoBMafi4COoIBCW/vfwz82ZVGMfzbUcOsOxsrAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-17T17:57:32.703993Z","bundle_sha256":"fee9a0a30ab18808b2863c9aa7cc21d0856f2969b1888e5f491203a49ba77acf"}}