{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:R5HC2G4GTXCF5EOYGQKPFFSFML","short_pith_number":"pith:R5HC2G4G","canonical_record":{"source":{"id":"2010.00200","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2020-10-01T05:27:51Z","cross_cats_sorted":["cs.CL"],"title_canon_sha256":"2bd23a73f41a7c9acd9bb2ba7ca09dac450a2baacde0fec100a0467c6cec49e6","abstract_canon_sha256":"eb904ff37708c64497664ad43ac76dde25b5b2b0addac68b06a74904edb468d1"},"schema_version":"1.0"},"canonical_sha256":"8f4e2d1b869dc45e91d83414f2964562dbc6083fc7c5d4175ebb111227a4a295","source":{"kind":"arxiv","id":"2010.00200","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2010.00200","created_at":"2026-07-05T01:39:31Z"},{"alias_kind":"arxiv_version","alias_value":"2010.00200v1","created_at":"2026-07-05T01:39:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2010.00200","created_at":"2026-07-05T01:39:31Z"},{"alias_kind":"pith_short_12","alias_value":"R5HC2G4GTXCF","created_at":"2026-07-05T01:39:31Z"},{"alias_kind":"pith_short_16","alias_value":"R5HC2G4GTXCF5EOY","created_at":"2026-07-05T01:39:31Z"},{"alias_kind":"pith_short_8","alias_value":"R5HC2G4G","created_at":"2026-07-05T01:39:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:R5HC2G4GTXCF5EOYGQKPFFSFML","target":"record","payload":{"canonical_record":{"source":{"id":"2010.00200","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2020-10-01T05:27:51Z","cross_cats_sorted":["cs.CL"],"title_canon_sha256":"2bd23a73f41a7c9acd9bb2ba7ca09dac450a2baacde0fec100a0467c6cec49e6","abstract_canon_sha256":"eb904ff37708c64497664ad43ac76dde25b5b2b0addac68b06a74904edb468d1"},"schema_version":"1.0"},"canonical_sha256":"8f4e2d1b869dc45e91d83414f2964562dbc6083fc7c5d4175ebb111227a4a295","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:39:31.284403Z","signature_b64":"KKnXZQmM99rpwKYOEcDkFV/Y4QY733VL0RJRKGVpGLbMiiFln9ZciYdBlLvsIhb+W/gxHBO4c1lw5wGEskPsDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8f4e2d1b869dc45e91d83414f2964562dbc6083fc7c5d4175ebb111227a4a295","last_reissued_at":"2026-07-05T01:39:31.284001Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:39:31.284001Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2010.00200","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":"2026-07-05T01:39:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cF2yVCVQMA/rUhgrSZ+FTuFHV1CH0iOJldGLmzomZXfcI5yCSn+pVBCHl27zXqSfpv1i9il6F4kYwD1SChWxCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T06:51:47.396003Z"},"content_sha256":"37a269ccd82f5a177fdf458e7c6b7dfaf61d849c98290de007e72416844587de","schema_version":"1.0","event_id":"sha256:37a269ccd82f5a177fdf458e7c6b7dfaf61d849c98290de007e72416844587de"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:R5HC2G4GTXCF5EOYGQKPFFSFML","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"RRF102: Meeting the TREC-COVID Challenge with a 100+ Runs Ensemble","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CL"],"primary_cat":"cs.IR","authors_text":"Honglei Zhuang, Ji Ma, Keith Hall, Michael Bendersky, Ryan McDonald, Shuguang Han","submitted_at":"2020-10-01T05:27:51Z","abstract_excerpt":"In this paper, we report the results of our participation in the TREC-COVID challenge. To meet the challenge of building a search engine for rapidly evolving biomedical collection, we propose a simple yet effective weighted hierarchical rank fusion approach, that ensembles together 102 runs from (a) lexical and semantic retrieval systems, (b) pre-trained and fine-tuned BERT rankers, and (c) relevance feedback runs. Our ablation studies demonstrate the contributions of each of these systems to the overall ensemble. The submitted ensemble runs achieved state-of-the-art performance in rounds 4 an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2010.00200","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/2010.00200/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":"2026-07-05T01:39:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BY3Jna4n1tWt2zA9HTX7/Y+sFABQbO1kfU6K54j9tM1bkuAH1DrwnMOzCoFaCMNBAtL4fGUFZ1tcw8fIfm/BAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T06:51:47.396422Z"},"content_sha256":"59e0dc84017fd4ee7cb3a96cb747f04b081d9a3b39d5d27d871f7a233ca19e9b","schema_version":"1.0","event_id":"sha256:59e0dc84017fd4ee7cb3a96cb747f04b081d9a3b39d5d27d871f7a233ca19e9b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R5HC2G4GTXCF5EOYGQKPFFSFML/bundle.json","state_url":"https://pith.science/pith/R5HC2G4GTXCF5EOYGQKPFFSFML/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R5HC2G4GTXCF5EOYGQKPFFSFML/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":"2026-07-09T06:51:47Z","links":{"resolver":"https://pith.science/pith/R5HC2G4GTXCF5EOYGQKPFFSFML","bundle":"https://pith.science/pith/R5HC2G4GTXCF5EOYGQKPFFSFML/bundle.json","state":"https://pith.science/pith/R5HC2G4GTXCF5EOYGQKPFFSFML/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R5HC2G4GTXCF5EOYGQKPFFSFML/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:R5HC2G4GTXCF5EOYGQKPFFSFML","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":"eb904ff37708c64497664ad43ac76dde25b5b2b0addac68b06a74904edb468d1","cross_cats_sorted":["cs.CL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2020-10-01T05:27:51Z","title_canon_sha256":"2bd23a73f41a7c9acd9bb2ba7ca09dac450a2baacde0fec100a0467c6cec49e6"},"schema_version":"1.0","source":{"id":"2010.00200","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2010.00200","created_at":"2026-07-05T01:39:31Z"},{"alias_kind":"arxiv_version","alias_value":"2010.00200v1","created_at":"2026-07-05T01:39:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2010.00200","created_at":"2026-07-05T01:39:31Z"},{"alias_kind":"pith_short_12","alias_value":"R5HC2G4GTXCF","created_at":"2026-07-05T01:39:31Z"},{"alias_kind":"pith_short_16","alias_value":"R5HC2G4GTXCF5EOY","created_at":"2026-07-05T01:39:31Z"},{"alias_kind":"pith_short_8","alias_value":"R5HC2G4G","created_at":"2026-07-05T01:39:31Z"}],"graph_snapshots":[{"event_id":"sha256:59e0dc84017fd4ee7cb3a96cb747f04b081d9a3b39d5d27d871f7a233ca19e9b","target":"graph","created_at":"2026-07-05T01:39:31Z","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/2010.00200/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper, we report the results of our participation in the TREC-COVID challenge. To meet the challenge of building a search engine for rapidly evolving biomedical collection, we propose a simple yet effective weighted hierarchical rank fusion approach, that ensembles together 102 runs from (a) lexical and semantic retrieval systems, (b) pre-trained and fine-tuned BERT rankers, and (c) relevance feedback runs. Our ablation studies demonstrate the contributions of each of these systems to the overall ensemble. The submitted ensemble runs achieved state-of-the-art performance in rounds 4 an","authors_text":"Honglei Zhuang, Ji Ma, Keith Hall, Michael Bendersky, Ryan McDonald, Shuguang Han","cross_cats":["cs.CL"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2020-10-01T05:27:51Z","title":"RRF102: Meeting the TREC-COVID Challenge with a 100+ Runs Ensemble"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2010.00200","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":"sha256:37a269ccd82f5a177fdf458e7c6b7dfaf61d849c98290de007e72416844587de","target":"record","created_at":"2026-07-05T01:39:31Z","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":"eb904ff37708c64497664ad43ac76dde25b5b2b0addac68b06a74904edb468d1","cross_cats_sorted":["cs.CL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IR","submitted_at":"2020-10-01T05:27:51Z","title_canon_sha256":"2bd23a73f41a7c9acd9bb2ba7ca09dac450a2baacde0fec100a0467c6cec49e6"},"schema_version":"1.0","source":{"id":"2010.00200","kind":"arxiv","version":1}},"canonical_sha256":"8f4e2d1b869dc45e91d83414f2964562dbc6083fc7c5d4175ebb111227a4a295","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8f4e2d1b869dc45e91d83414f2964562dbc6083fc7c5d4175ebb111227a4a295","first_computed_at":"2026-07-05T01:39:31.284001Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:39:31.284001Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KKnXZQmM99rpwKYOEcDkFV/Y4QY733VL0RJRKGVpGLbMiiFln9ZciYdBlLvsIhb+W/gxHBO4c1lw5wGEskPsDA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:39:31.284403Z","signed_message":"canonical_sha256_bytes"},"source_id":"2010.00200","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:37a269ccd82f5a177fdf458e7c6b7dfaf61d849c98290de007e72416844587de","sha256:59e0dc84017fd4ee7cb3a96cb747f04b081d9a3b39d5d27d871f7a233ca19e9b"],"state_sha256":"28ab00f102370174abab56657f7d2331bebf6227f026b0564b32fced1b00bf39"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S9F7HmZScJW9K8gBTnNmL1GPEMZTcuFvBCS+4Kmx+MFsnyQxZtcum5h4KlYcIBD7YBYEqFugCluszrUhgkD/DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-09T06:51:47.398783Z","bundle_sha256":"69985eacebf0d7dd5aba09d10ce692ca5d132db4610073c3a0f9bd7ec8bfc7a5"}}