{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:U2SDXGCQQSUHRBRU4CDU43YKJF","short_pith_number":"pith:U2SDXGCQ","schema_version":"1.0","canonical_sha256":"a6a43b985084a8788634e0874e6f0a497eac8cd2d3bdafd1b74396e7708a4547","source":{"kind":"arxiv","id":"2106.12990","version":1},"attestation_state":"computed","paper":{"title":"The Probabilistic Random Forest applied to the selection of quasar candidates in the QUBRICS Survey","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Andrea Grazian, Fabio Fontanot, Francesco Guarneri, Giorgio Calderone, Guido Cupani, Konstantina Boutsia, Stefano Cristiani, Valentina D'Odorico","submitted_at":"2021-06-24T13:05:26Z","abstract_excerpt":"The number of known, bright ($i<18$), high-redshift ($z>2.5$) QSOs in the Southern Hemisphere is considerably lower than the corresponding number in the Northern Hemisphere due to the lack of multi-wavelength surveys at $\\delta<0$. Recent works, such as the QUBRICS survey, successfully identified new, high-redshift QSOs in the South by means of a machine learning approach applied on a large photometric dataset. Building on the success of QUBRICS, we present a new QSO selection method based on the Probabilistic Random Forest (PRF), an improvement of the classic Random Forest algorithm. The PRF "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2106.12990","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-06-24T13:05:26Z","cross_cats_sorted":[],"title_canon_sha256":"5916b40a325b3c2c3b6b6935d9446795bac92c79b6f312580b56f4c984812769","abstract_canon_sha256":"dc8bb7fc79e2d1e7a1f8104cede0f850a2921fb931fd99eba8295cb23c5a5f52"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:57:24.476091Z","signature_b64":"807HE0jOthllDi+VOEMtOJbI5ZyxaBScsfnePiFyHN/0MGIwX94Ju87XS/aSesneXq/qBLCBRYtqBIXyfqKEDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a6a43b985084a8788634e0874e6f0a497eac8cd2d3bdafd1b74396e7708a4547","last_reissued_at":"2026-07-05T02:57:24.475670Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:57:24.475670Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Probabilistic Random Forest applied to the selection of quasar candidates in the QUBRICS Survey","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Andrea Grazian, Fabio Fontanot, Francesco Guarneri, Giorgio Calderone, Guido Cupani, Konstantina Boutsia, Stefano Cristiani, Valentina D'Odorico","submitted_at":"2021-06-24T13:05:26Z","abstract_excerpt":"The number of known, bright ($i<18$), high-redshift ($z>2.5$) QSOs in the Southern Hemisphere is considerably lower than the corresponding number in the Northern Hemisphere due to the lack of multi-wavelength surveys at $\\delta<0$. Recent works, such as the QUBRICS survey, successfully identified new, high-redshift QSOs in the South by means of a machine learning approach applied on a large photometric dataset. Building on the success of QUBRICS, we present a new QSO selection method based on the Probabilistic Random Forest (PRF), an improvement of the classic Random Forest algorithm. The PRF "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.12990","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/2106.12990/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2106.12990","created_at":"2026-07-05T02:57:24.475727+00:00"},{"alias_kind":"arxiv_version","alias_value":"2106.12990v1","created_at":"2026-07-05T02:57:24.475727+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2106.12990","created_at":"2026-07-05T02:57:24.475727+00:00"},{"alias_kind":"pith_short_12","alias_value":"U2SDXGCQQSUH","created_at":"2026-07-05T02:57:24.475727+00:00"},{"alias_kind":"pith_short_16","alias_value":"U2SDXGCQQSUHRBRU","created_at":"2026-07-05T02:57:24.475727+00:00"},{"alias_kind":"pith_short_8","alias_value":"U2SDXGCQ","created_at":"2026-07-05T02:57:24.475727+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/U2SDXGCQQSUHRBRU4CDU43YKJF","json":"https://pith.science/pith/U2SDXGCQQSUHRBRU4CDU43YKJF.json","graph_json":"https://pith.science/api/pith-number/U2SDXGCQQSUHRBRU4CDU43YKJF/graph.json","events_json":"https://pith.science/api/pith-number/U2SDXGCQQSUHRBRU4CDU43YKJF/events.json","paper":"https://pith.science/paper/U2SDXGCQ"},"agent_actions":{"view_html":"https://pith.science/pith/U2SDXGCQQSUHRBRU4CDU43YKJF","download_json":"https://pith.science/pith/U2SDXGCQQSUHRBRU4CDU43YKJF.json","view_paper":"https://pith.science/paper/U2SDXGCQ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2106.12990&json=true","fetch_graph":"https://pith.science/api/pith-number/U2SDXGCQQSUHRBRU4CDU43YKJF/graph.json","fetch_events":"https://pith.science/api/pith-number/U2SDXGCQQSUHRBRU4CDU43YKJF/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/U2SDXGCQQSUHRBRU4CDU43YKJF/action/timestamp_anchor","attest_storage":"https://pith.science/pith/U2SDXGCQQSUHRBRU4CDU43YKJF/action/storage_attestation","attest_author":"https://pith.science/pith/U2SDXGCQQSUHRBRU4CDU43YKJF/action/author_attestation","sign_citation":"https://pith.science/pith/U2SDXGCQQSUHRBRU4CDU43YKJF/action/citation_signature","submit_replication":"https://pith.science/pith/U2SDXGCQQSUHRBRU4CDU43YKJF/action/replication_record"}},"created_at":"2026-07-05T02:57:24.475727+00:00","updated_at":"2026-07-05T02:57:24.475727+00:00"}