{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:YOXVIKR2JZHBMQHYYBOJICXAT6","short_pith_number":"pith:YOXVIKR2","canonical_record":{"source":{"id":"2106.00955","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2021-06-02T05:45:49Z","cross_cats_sorted":[],"title_canon_sha256":"70bf5fedc11b3ff91ed8db347a9b0c705ddac9f20c560e7dadf4e48ec7729f23","abstract_canon_sha256":"8b4183521e6a6d681ea8264d21819d792e5e3479982139c31837420d8ed30345"},"schema_version":"1.0"},"canonical_sha256":"c3af542a3a4e4e1640f8c05c940ae09f8c930baf92931832ffdab00a3757652a","source":{"kind":"arxiv","id":"2106.00955","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2106.00955","created_at":"2026-07-05T02:45:41Z"},{"alias_kind":"arxiv_version","alias_value":"2106.00955v1","created_at":"2026-07-05T02:45:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2106.00955","created_at":"2026-07-05T02:45:41Z"},{"alias_kind":"pith_short_12","alias_value":"YOXVIKR2JZHB","created_at":"2026-07-05T02:45:41Z"},{"alias_kind":"pith_short_16","alias_value":"YOXVIKR2JZHBMQHY","created_at":"2026-07-05T02:45:41Z"},{"alias_kind":"pith_short_8","alias_value":"YOXVIKR2","created_at":"2026-07-05T02:45:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:YOXVIKR2JZHBMQHYYBOJICXAT6","target":"record","payload":{"canonical_record":{"source":{"id":"2106.00955","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2021-06-02T05:45:49Z","cross_cats_sorted":[],"title_canon_sha256":"70bf5fedc11b3ff91ed8db347a9b0c705ddac9f20c560e7dadf4e48ec7729f23","abstract_canon_sha256":"8b4183521e6a6d681ea8264d21819d792e5e3479982139c31837420d8ed30345"},"schema_version":"1.0"},"canonical_sha256":"c3af542a3a4e4e1640f8c05c940ae09f8c930baf92931832ffdab00a3757652a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:45:41.968711Z","signature_b64":"u4o1B9AD9OwWvrAUGjA4prDuJJOj061wQ35ZfDWfqe6N1sBxbUDSgkGr1y1zDcpTkCKzMMfwCveV+mdpxV+uDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c3af542a3a4e4e1640f8c05c940ae09f8c930baf92931832ffdab00a3757652a","last_reissued_at":"2026-07-05T02:45:41.968366Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:45:41.968366Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2106.00955","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":"2026-07-05T02:45:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9SquwIGBFyFszMj6halrhgzr0HVOzBhSj+FHPgSVtuMTl/LzbEA4/6dXbxyqCvTjRYJT26U0wWgD+qYvxXxFCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T05:33:20.778750Z"},"content_sha256":"b36a813b3dd81d964d83a2923f568fc412e47df6db9c2f2dbfdf2de3d66e0657","schema_version":"1.0","event_id":"sha256:b36a813b3dd81d964d83a2923f568fc412e47df6db9c2f2dbfdf2de3d66e0657"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:YOXVIKR2JZHBMQHYYBOJICXAT6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Answer Generation for Retrieval-based Question Answering Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CL","authors_text":"Alessandro Moschitti, Chao-Chun Hsu, Eric Lind, Luca Soldaini","submitted_at":"2021-06-02T05:45:49Z","abstract_excerpt":"Recent advancements in transformer-based models have greatly improved the ability of Question Answering (QA) systems to provide correct answers; in particular, answer sentence selection (AS2) models, core components of retrieval-based systems, have achieved impressive results. While generally effective, these models fail to provide a satisfying answer when all retrieved candidates are of poor quality, even if they contain correct information. In AS2, models are trained to select the best answer sentence among a set of candidates retrieved for a given question. In this work, we propose to gener"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.00955","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2106.00955/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":"2026-07-05T02:45:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iTqcA4nNeyFBoydZk7vH9V56iEIEy1tX+/iB2sJPkYPtnBOsj2pKzGdHWpk4VkrZEHJBn2e0tAEfGn+/OgXxDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T05:33:20.779316Z"},"content_sha256":"39f4a92f9c2e019fe6ec3b63ea44f3e5684703ec428d82119e8cf3591541b124","schema_version":"1.0","event_id":"sha256:39f4a92f9c2e019fe6ec3b63ea44f3e5684703ec428d82119e8cf3591541b124"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YOXVIKR2JZHBMQHYYBOJICXAT6/bundle.json","state_url":"https://pith.science/pith/YOXVIKR2JZHBMQHYYBOJICXAT6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YOXVIKR2JZHBMQHYYBOJICXAT6/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":"2026-08-20T05:33:20Z","links":{"resolver":"https://pith.science/pith/YOXVIKR2JZHBMQHYYBOJICXAT6","bundle":"https://pith.science/pith/YOXVIKR2JZHBMQHYYBOJICXAT6/bundle.json","state":"https://pith.science/pith/YOXVIKR2JZHBMQHYYBOJICXAT6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YOXVIKR2JZHBMQHYYBOJICXAT6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:YOXVIKR2JZHBMQHYYBOJICXAT6","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":"8b4183521e6a6d681ea8264d21819d792e5e3479982139c31837420d8ed30345","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2021-06-02T05:45:49Z","title_canon_sha256":"70bf5fedc11b3ff91ed8db347a9b0c705ddac9f20c560e7dadf4e48ec7729f23"},"schema_version":"1.0","source":{"id":"2106.00955","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2106.00955","created_at":"2026-07-05T02:45:41Z"},{"alias_kind":"arxiv_version","alias_value":"2106.00955v1","created_at":"2026-07-05T02:45:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2106.00955","created_at":"2026-07-05T02:45:41Z"},{"alias_kind":"pith_short_12","alias_value":"YOXVIKR2JZHB","created_at":"2026-07-05T02:45:41Z"},{"alias_kind":"pith_short_16","alias_value":"YOXVIKR2JZHBMQHY","created_at":"2026-07-05T02:45:41Z"},{"alias_kind":"pith_short_8","alias_value":"YOXVIKR2","created_at":"2026-07-05T02:45:41Z"}],"graph_snapshots":[{"event_id":"sha256:39f4a92f9c2e019fe6ec3b63ea44f3e5684703ec428d82119e8cf3591541b124","target":"graph","created_at":"2026-07-05T02:45:41Z","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/2106.00955/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Recent advancements in transformer-based models have greatly improved the ability of Question Answering (QA) systems to provide correct answers; in particular, answer sentence selection (AS2) models, core components of retrieval-based systems, have achieved impressive results. While generally effective, these models fail to provide a satisfying answer when all retrieved candidates are of poor quality, even if they contain correct information. In AS2, models are trained to select the best answer sentence among a set of candidates retrieved for a given question. In this work, we propose to gener","authors_text":"Alessandro Moschitti, Chao-Chun Hsu, Eric Lind, Luca Soldaini","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2021-06-02T05:45:49Z","title":"Answer Generation for Retrieval-based Question Answering Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.00955","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:b36a813b3dd81d964d83a2923f568fc412e47df6db9c2f2dbfdf2de3d66e0657","target":"record","created_at":"2026-07-05T02:45:41Z","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":"8b4183521e6a6d681ea8264d21819d792e5e3479982139c31837420d8ed30345","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2021-06-02T05:45:49Z","title_canon_sha256":"70bf5fedc11b3ff91ed8db347a9b0c705ddac9f20c560e7dadf4e48ec7729f23"},"schema_version":"1.0","source":{"id":"2106.00955","kind":"arxiv","version":1}},"canonical_sha256":"c3af542a3a4e4e1640f8c05c940ae09f8c930baf92931832ffdab00a3757652a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c3af542a3a4e4e1640f8c05c940ae09f8c930baf92931832ffdab00a3757652a","first_computed_at":"2026-07-05T02:45:41.968366Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:45:41.968366Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"u4o1B9AD9OwWvrAUGjA4prDuJJOj061wQ35ZfDWfqe6N1sBxbUDSgkGr1y1zDcpTkCKzMMfwCveV+mdpxV+uDw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:45:41.968711Z","signed_message":"canonical_sha256_bytes"},"source_id":"2106.00955","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b36a813b3dd81d964d83a2923f568fc412e47df6db9c2f2dbfdf2de3d66e0657","sha256:39f4a92f9c2e019fe6ec3b63ea44f3e5684703ec428d82119e8cf3591541b124"],"state_sha256":"d7e1184e0badde29b085ee0beff1e48340cf0b986077ec5632c4129fc928fca3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XJYd+idIkFlemB+BHbeLkUsUv78IBH9L7M5aHTefs6WNXJ6AV0AbvHKFhG41zFr8lVOwsCQo1X8KFYFq5+X8CA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T05:33:20.784708Z","bundle_sha256":"7887f8dbe8e4e047ce8e18ff6e1ea28da18b85e061ddefd426f51ae02a702973"}}