{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:55KJWOPPBDFLT5MUTKWJ7DVYML","short_pith_number":"pith:55KJWOPP","canonical_record":{"source":{"id":"2209.07257","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-09-15T12:47:42Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"989504f652796cb1d6c4a488c79de68760b050c2cb28cad41efae565ff66f5bc","abstract_canon_sha256":"8c34759aee4a843c36f19c00ea4fca64b1e1e3996b58bd258463a3dc067027dd"},"schema_version":"1.0"},"canonical_sha256":"ef549b39ef08cab9f5949aac9f8eb862ea069d65d98fad380bea0f732ed8c4b3","source":{"kind":"arxiv","id":"2209.07257","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2209.07257","created_at":"2026-07-05T05:05:39Z"},{"alias_kind":"arxiv_version","alias_value":"2209.07257v2","created_at":"2026-07-05T05:05:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2209.07257","created_at":"2026-07-05T05:05:39Z"},{"alias_kind":"pith_short_12","alias_value":"55KJWOPPBDFL","created_at":"2026-07-05T05:05:39Z"},{"alias_kind":"pith_short_16","alias_value":"55KJWOPPBDFLT5MU","created_at":"2026-07-05T05:05:39Z"},{"alias_kind":"pith_short_8","alias_value":"55KJWOPP","created_at":"2026-07-05T05:05:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:55KJWOPPBDFLT5MUTKWJ7DVYML","target":"record","payload":{"canonical_record":{"source":{"id":"2209.07257","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-09-15T12:47:42Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"989504f652796cb1d6c4a488c79de68760b050c2cb28cad41efae565ff66f5bc","abstract_canon_sha256":"8c34759aee4a843c36f19c00ea4fca64b1e1e3996b58bd258463a3dc067027dd"},"schema_version":"1.0"},"canonical_sha256":"ef549b39ef08cab9f5949aac9f8eb862ea069d65d98fad380bea0f732ed8c4b3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:05:39.402110Z","signature_b64":"x8b7GBrQBZAkoHZuYBwcvRrutb/GTwQc3w4W5dT250CCbtxDNJB3ssOUzUmxoVaaS9pq0s7HHZzVnKPjE/arDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ef549b39ef08cab9f5949aac9f8eb862ea069d65d98fad380bea0f732ed8c4b3","last_reissued_at":"2026-07-05T05:05:39.401705Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:05:39.401705Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2209.07257","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":"2026-07-05T05:05:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yd4Gqao4Rtde2kXWoVhHvA5BNQimgBTkswGojDJ31HHWhiAlfUVV2EYKpOwebxe8O1B85zNTZvPrOnNs76d7Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-20T11:32:02.862457Z"},"content_sha256":"a7259d7870ceebee73d347e64b6015ffcc15d58cff4d1072b22f9c45fac13058","schema_version":"1.0","event_id":"sha256:a7259d7870ceebee73d347e64b6015ffcc15d58cff4d1072b22f9c45fac13058"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:55KJWOPPBDFLT5MUTKWJ7DVYML","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The probabilistic random forest applied to the QUBRICS survey: improving the selection of high-redshift quasars with synthetic data","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.IM","authors_text":"Andrea Grazian, Angela Bongiorno, Fabio Fontanot, Francesco Guarneri, Giorgio Calderone, Guido Cupani, Ivano Saccheo, Konstantina Boutsia, Luciano Nicastro, Matteo Porru, Michael T. Murphy, Stefano Cristiani, Valentina D'Odorico","submitted_at":"2022-09-15T12:47:42Z","abstract_excerpt":"Several recent works have focused on the search for bright, high-z quasars (QSOs) in the South. Among them, the QUasars as BRIght beacons for Cosmology in the Southern hemisphere (QUBRICS) survey has now delivered hundreds of new spectroscopically confirmed QSOs selected by means of machine learning algorithms. Building upon the results obtained by introducing the probabilistic random forest (PRF) for the QUBRICS selection, we explore in this work the feasibility of training the algorithm on synthetic data to improve the completeness in the higher redshift bins. We also compare the performance"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2209.07257","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/2209.07257/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":"2026-07-05T05:05:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r8at0zZ5GUS7N0a85XDGvlQ0M/PlLvFjxfo/PRVzVp8Nhjdp27C/hD7lvuzgra0XZ7K94Msso88AabsjBuTrDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-20T11:32:02.862830Z"},"content_sha256":"bf54cac90682dd992aa566b0091a232e0e1dbf0e14001b2431df65a9e6579450","schema_version":"1.0","event_id":"sha256:bf54cac90682dd992aa566b0091a232e0e1dbf0e14001b2431df65a9e6579450"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/55KJWOPPBDFLT5MUTKWJ7DVYML/bundle.json","state_url":"https://pith.science/pith/55KJWOPPBDFLT5MUTKWJ7DVYML/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/55KJWOPPBDFLT5MUTKWJ7DVYML/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":"2026-07-20T11:32:02Z","links":{"resolver":"https://pith.science/pith/55KJWOPPBDFLT5MUTKWJ7DVYML","bundle":"https://pith.science/pith/55KJWOPPBDFLT5MUTKWJ7DVYML/bundle.json","state":"https://pith.science/pith/55KJWOPPBDFLT5MUTKWJ7DVYML/state.json","well_known_bundle":"https://pith.science/.well-known/pith/55KJWOPPBDFLT5MUTKWJ7DVYML/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:55KJWOPPBDFLT5MUTKWJ7DVYML","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":"8c34759aee4a843c36f19c00ea4fca64b1e1e3996b58bd258463a3dc067027dd","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-09-15T12:47:42Z","title_canon_sha256":"989504f652796cb1d6c4a488c79de68760b050c2cb28cad41efae565ff66f5bc"},"schema_version":"1.0","source":{"id":"2209.07257","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2209.07257","created_at":"2026-07-05T05:05:39Z"},{"alias_kind":"arxiv_version","alias_value":"2209.07257v2","created_at":"2026-07-05T05:05:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2209.07257","created_at":"2026-07-05T05:05:39Z"},{"alias_kind":"pith_short_12","alias_value":"55KJWOPPBDFL","created_at":"2026-07-05T05:05:39Z"},{"alias_kind":"pith_short_16","alias_value":"55KJWOPPBDFLT5MU","created_at":"2026-07-05T05:05:39Z"},{"alias_kind":"pith_short_8","alias_value":"55KJWOPP","created_at":"2026-07-05T05:05:39Z"}],"graph_snapshots":[{"event_id":"sha256:bf54cac90682dd992aa566b0091a232e0e1dbf0e14001b2431df65a9e6579450","target":"graph","created_at":"2026-07-05T05:05:39Z","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/2209.07257/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Several recent works have focused on the search for bright, high-z quasars (QSOs) in the South. Among them, the QUasars as BRIght beacons for Cosmology in the Southern hemisphere (QUBRICS) survey has now delivered hundreds of new spectroscopically confirmed QSOs selected by means of machine learning algorithms. Building upon the results obtained by introducing the probabilistic random forest (PRF) for the QUBRICS selection, we explore in this work the feasibility of training the algorithm on synthetic data to improve the completeness in the higher redshift bins. We also compare the performance","authors_text":"Andrea Grazian, Angela Bongiorno, Fabio Fontanot, Francesco Guarneri, Giorgio Calderone, Guido Cupani, Ivano Saccheo, Konstantina Boutsia, Luciano Nicastro, Matteo Porru, Michael T. Murphy, Stefano Cristiani, Valentina D'Odorico","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-09-15T12:47:42Z","title":"The probabilistic random forest applied to the QUBRICS survey: improving the selection of high-redshift quasars with synthetic data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2209.07257","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:a7259d7870ceebee73d347e64b6015ffcc15d58cff4d1072b22f9c45fac13058","target":"record","created_at":"2026-07-05T05:05:39Z","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":"8c34759aee4a843c36f19c00ea4fca64b1e1e3996b58bd258463a3dc067027dd","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-09-15T12:47:42Z","title_canon_sha256":"989504f652796cb1d6c4a488c79de68760b050c2cb28cad41efae565ff66f5bc"},"schema_version":"1.0","source":{"id":"2209.07257","kind":"arxiv","version":2}},"canonical_sha256":"ef549b39ef08cab9f5949aac9f8eb862ea069d65d98fad380bea0f732ed8c4b3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ef549b39ef08cab9f5949aac9f8eb862ea069d65d98fad380bea0f732ed8c4b3","first_computed_at":"2026-07-05T05:05:39.401705Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:05:39.401705Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"x8b7GBrQBZAkoHZuYBwcvRrutb/GTwQc3w4W5dT250CCbtxDNJB3ssOUzUmxoVaaS9pq0s7HHZzVnKPjE/arDg==","signature_status":"signed_v1","signed_at":"2026-07-05T05:05:39.402110Z","signed_message":"canonical_sha256_bytes"},"source_id":"2209.07257","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a7259d7870ceebee73d347e64b6015ffcc15d58cff4d1072b22f9c45fac13058","sha256:bf54cac90682dd992aa566b0091a232e0e1dbf0e14001b2431df65a9e6579450"],"state_sha256":"c3a039c07f3d5a76f674f711794d400f01a7fe1d0921bf7c569e60816b9bbfc8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"huH7eGEbqfjPMb+EG7Mrh5DqkrGTh4u9ChdJEp6rx8uEAiTXFaQ802XrzeeSMc7pdJwDuVEhaKvXB6g6y3YJAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-20T11:32:02.864995Z","bundle_sha256":"4c27122a82d0c48cc0623ed8296a9bd8bcf925d272a4e6e712b0b369700d96a1"}}