{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:E25VCHHJK6QD7NFZMOQHAJ65DS","short_pith_number":"pith:E25VCHHJ","canonical_record":{"source":{"id":"1808.10523","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2018-08-30T21:12:03Z","cross_cats_sorted":[],"title_canon_sha256":"d0e21a49c84bba93469b549b5a903b1270c78910f5c7b1e0515b8cbc22f8d548","abstract_canon_sha256":"ba252ba8b18f8b5931e1d8c05864bb708e5b6163a814dfdd3197b575912102f4"},"schema_version":"1.0"},"canonical_sha256":"26bb511ce957a03fb4b963a07027dd1cab7170fdfdd915c9cd176bf7780b6746","source":{"kind":"arxiv","id":"1808.10523","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.10523","created_at":"2026-05-18T00:06:45Z"},{"alias_kind":"arxiv_version","alias_value":"1808.10523v1","created_at":"2026-05-18T00:06:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.10523","created_at":"2026-05-18T00:06:45Z"},{"alias_kind":"pith_short_12","alias_value":"E25VCHHJK6QD","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"E25VCHHJK6QD7NFZ","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"E25VCHHJ","created_at":"2026-05-18T12:32:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:E25VCHHJK6QD7NFZMOQHAJ65DS","target":"record","payload":{"canonical_record":{"source":{"id":"1808.10523","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2018-08-30T21:12:03Z","cross_cats_sorted":[],"title_canon_sha256":"d0e21a49c84bba93469b549b5a903b1270c78910f5c7b1e0515b8cbc22f8d548","abstract_canon_sha256":"ba252ba8b18f8b5931e1d8c05864bb708e5b6163a814dfdd3197b575912102f4"},"schema_version":"1.0"},"canonical_sha256":"26bb511ce957a03fb4b963a07027dd1cab7170fdfdd915c9cd176bf7780b6746","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:06:45.465068Z","signature_b64":"kxs7idpNACTCSrzSoXUo6dhgmTCGVw3ipLJiPYSd6TVqd6Bm7sma+OJS9SWqvoehMZpTSZYqfd1MoneKLtXDAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"26bb511ce957a03fb4b963a07027dd1cab7170fdfdd915c9cd176bf7780b6746","last_reissued_at":"2026-05-18T00:06:45.464478Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:06:45.464478Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.10523","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":"2026-05-18T00:06:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0wtxp+kQd23tQWjpw75G/oOVStZelt37fcH54SDBhkvYeGkgQ3IwlOprzk+/q/sb0VH85yVUp7vE0O0DzFyTAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T19:46:58.222172Z"},"content_sha256":"5c8b5ded2fa5af52122af253e580c7ac268cf16265b6f3c4e5441490d15b32b2","schema_version":"1.0","event_id":"sha256:5c8b5ded2fa5af52122af253e580c7ac268cf16265b6f3c4e5441490d15b32b2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:E25VCHHJK6QD7NFZMOQHAJ65DS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectral Collaborative Filtering","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.IR","authors_text":"Chun-Ta Lu, Fei Jiang, Jiawei Zhang, Lei Zheng, Philip S. Yu","submitted_at":"2018-08-30T21:12:03Z","abstract_excerpt":"Despite the popularity of Collaborative Filtering (CF), CF-based methods are haunted by the \\textit{cold-start} problem, which has a significantly negative impact on users' experiences with Recommender Systems (RS). In this paper, to overcome the aforementioned drawback, we first formulate the relationships between users and items as a bipartite graph. Then, we propose a new spectral convolution operation directly performing in the \\textit{spectral domain}, where not only the proximity information of a graph but also the connectivity information hidden in the graph are revealed. With the propo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.10523","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":""},"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":"2026-05-18T00:06:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9HZm3OECpI9eSfFKTTnA26wKQ7bRKZVNFX5cWMBkhwrbCarMZKGBHzK+Z8uTFwyCZesr/gUOj1HTp1jSFDBmCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T19:46:58.222859Z"},"content_sha256":"8ad1a50d4cdaf28b79967311a85bf0fe17fed1d69fff0c49bd9d09f85609bab2","schema_version":"1.0","event_id":"sha256:8ad1a50d4cdaf28b79967311a85bf0fe17fed1d69fff0c49bd9d09f85609bab2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/E25VCHHJK6QD7NFZMOQHAJ65DS/bundle.json","state_url":"https://pith.science/pith/E25VCHHJK6QD7NFZMOQHAJ65DS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/E25VCHHJK6QD7NFZMOQHAJ65DS/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":"2026-05-28T19:46:58Z","links":{"resolver":"https://pith.science/pith/E25VCHHJK6QD7NFZMOQHAJ65DS","bundle":"https://pith.science/pith/E25VCHHJK6QD7NFZMOQHAJ65DS/bundle.json","state":"https://pith.science/pith/E25VCHHJK6QD7NFZMOQHAJ65DS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/E25VCHHJK6QD7NFZMOQHAJ65DS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:E25VCHHJK6QD7NFZMOQHAJ65DS","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":"ba252ba8b18f8b5931e1d8c05864bb708e5b6163a814dfdd3197b575912102f4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2018-08-30T21:12:03Z","title_canon_sha256":"d0e21a49c84bba93469b549b5a903b1270c78910f5c7b1e0515b8cbc22f8d548"},"schema_version":"1.0","source":{"id":"1808.10523","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.10523","created_at":"2026-05-18T00:06:45Z"},{"alias_kind":"arxiv_version","alias_value":"1808.10523v1","created_at":"2026-05-18T00:06:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.10523","created_at":"2026-05-18T00:06:45Z"},{"alias_kind":"pith_short_12","alias_value":"E25VCHHJK6QD","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"E25VCHHJK6QD7NFZ","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"E25VCHHJ","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:8ad1a50d4cdaf28b79967311a85bf0fe17fed1d69fff0c49bd9d09f85609bab2","target":"graph","created_at":"2026-05-18T00:06:45Z","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":"Despite the popularity of Collaborative Filtering (CF), CF-based methods are haunted by the \\textit{cold-start} problem, which has a significantly negative impact on users' experiences with Recommender Systems (RS). In this paper, to overcome the aforementioned drawback, we first formulate the relationships between users and items as a bipartite graph. Then, we propose a new spectral convolution operation directly performing in the \\textit{spectral domain}, where not only the proximity information of a graph but also the connectivity information hidden in the graph are revealed. With the propo","authors_text":"Chun-Ta Lu, Fei Jiang, Jiawei Zhang, Lei Zheng, Philip S. Yu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2018-08-30T21:12:03Z","title":"Spectral Collaborative Filtering"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.10523","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":"sha256:5c8b5ded2fa5af52122af253e580c7ac268cf16265b6f3c4e5441490d15b32b2","target":"record","created_at":"2026-05-18T00:06:45Z","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":"ba252ba8b18f8b5931e1d8c05864bb708e5b6163a814dfdd3197b575912102f4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2018-08-30T21:12:03Z","title_canon_sha256":"d0e21a49c84bba93469b549b5a903b1270c78910f5c7b1e0515b8cbc22f8d548"},"schema_version":"1.0","source":{"id":"1808.10523","kind":"arxiv","version":1}},"canonical_sha256":"26bb511ce957a03fb4b963a07027dd1cab7170fdfdd915c9cd176bf7780b6746","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"26bb511ce957a03fb4b963a07027dd1cab7170fdfdd915c9cd176bf7780b6746","first_computed_at":"2026-05-18T00:06:45.464478Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:45.464478Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kxs7idpNACTCSrzSoXUo6dhgmTCGVw3ipLJiPYSd6TVqd6Bm7sma+OJS9SWqvoehMZpTSZYqfd1MoneKLtXDAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:45.465068Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.10523","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5c8b5ded2fa5af52122af253e580c7ac268cf16265b6f3c4e5441490d15b32b2","sha256:8ad1a50d4cdaf28b79967311a85bf0fe17fed1d69fff0c49bd9d09f85609bab2"],"state_sha256":"508bb36d45908347d3fabb8e5e520150be0fd14b2d8604ffbd91f2fa11eac868"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"he7z16hC6uP4oH1E+OFjjzyrubVw6W7DmdxZQDnuhr2QC0ho/t7qBjQOFFeOgLBjlL/viz5Msm0ohf/Uys+YBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T19:46:58.226302Z","bundle_sha256":"241e2d29db2764379ed3520ecba3f890b30613327bc2e16c9bd4573c6184b013"}}