{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:2QSZA44ROINZVCP6WMOW4I4QWB","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":"5e6346a6630b3826fb4a0907e1c8c0b89c85f1068e76af1066de528bf3d4e8a6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2021-02-01T07:35:52Z","title_canon_sha256":"5db9943649dc86ed970597d35e8415a577fe345cad130130a9474dea07272863"},"schema_version":"1.0","source":{"id":"2102.00677","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.00677","created_at":"2026-07-05T02:11:14Z"},{"alias_kind":"arxiv_version","alias_value":"2102.00677v1","created_at":"2026-07-05T02:11:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.00677","created_at":"2026-07-05T02:11:14Z"},{"alias_kind":"pith_short_12","alias_value":"2QSZA44ROINZ","created_at":"2026-07-05T02:11:14Z"},{"alias_kind":"pith_short_16","alias_value":"2QSZA44ROINZVCP6","created_at":"2026-07-05T02:11:14Z"},{"alias_kind":"pith_short_8","alias_value":"2QSZA44R","created_at":"2026-07-05T02:11:14Z"}],"graph_snapshots":[{"event_id":"sha256:6aeab787d2e231d6f8a0f96a2277aea7aa79151946ea89268190b640519002c3","target":"graph","created_at":"2026-07-05T02:11:14Z","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/2102.00677/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Answer selection is a task to choose the positive answers from a pool of candidate answers for a given question. In this paper, we propose a novel strategy for answer selection, called hierarchical ranking. We introduce three levels of ranking: point-level ranking, pair-level ranking, and list-level ranking. They formulate their optimization objectives by employing supervisory information from different perspectives to achieve the same goal of ranking candidate answers. Therefore, the three levels of ranking are related and they can promote each other. We take the well-performed compare-aggreg","authors_text":"Hang Gao, Mengting Hu, Renhong Cheng, Tiegang Gao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2021-02-01T07:35:52Z","title":"Hierarchical Ranking for Answer Selection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.00677","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":"sha256:87d45154ee34446cd9f85ee0b111116c8b35d244a202220c4600dfd2ddc7215f","target":"record","created_at":"2026-07-05T02:11:14Z","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":"5e6346a6630b3826fb4a0907e1c8c0b89c85f1068e76af1066de528bf3d4e8a6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2021-02-01T07:35:52Z","title_canon_sha256":"5db9943649dc86ed970597d35e8415a577fe345cad130130a9474dea07272863"},"schema_version":"1.0","source":{"id":"2102.00677","kind":"arxiv","version":1}},"canonical_sha256":"d425907391721b9a89feb31d6e2390b046e2e4a436c85b146f94b0cd249bb951","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d425907391721b9a89feb31d6e2390b046e2e4a436c85b146f94b0cd249bb951","first_computed_at":"2026-07-05T02:11:14.473759Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:11:14.473759Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uKRi0MKtsGcZqxe9NhT1z3SokRQ5ie06A7joX/2X/Upzfvn4pB8igru0vQ6csYQTkoJlZ8pWTHPCN/EPBndoCw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:11:14.474225Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.00677","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:87d45154ee34446cd9f85ee0b111116c8b35d244a202220c4600dfd2ddc7215f","sha256:6aeab787d2e231d6f8a0f96a2277aea7aa79151946ea89268190b640519002c3"],"state_sha256":"f5edb774d0968d98d374841d075bfe33bb33d8e2779aabc5693f08e943a00def"}