{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:DU2EEY4ZOW4V5WFQ25HNCAXH6V","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":"8c841f9b00caf5b1e289f388301f8b3e775456d0758ae47e5a85e61deebc8807","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-09T00:47:01Z","title_canon_sha256":"9f05e1f5634d828dfcfe0ef2664a8e2898942360e2ddbac81a040e64d4f2d6be"},"schema_version":"1.0","source":{"id":"1011.1951","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1011.1951","created_at":"2026-05-18T02:04:50Z"},{"alias_kind":"arxiv_version","alias_value":"1011.1951v1","created_at":"2026-05-18T02:04:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.1951","created_at":"2026-05-18T02:04:50Z"},{"alias_kind":"pith_short_12","alias_value":"DU2EEY4ZOW4V","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_16","alias_value":"DU2EEY4ZOW4V5WFQ","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_8","alias_value":"DU2EEY4Z","created_at":"2026-05-18T12:26:06Z"}],"graph_snapshots":[{"event_id":"sha256:32a0f874ad3da440a20c16193074f7bf5ee5ee789d1e76bae24b2ff615601a18","target":"graph","created_at":"2026-05-18T02:04:50Z","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"},"paper":{"abstract_excerpt":"We study the star/galaxy classification efficiency of 13 different decision tree algorithms applied to photometric objects in the Sloan Digital Sky Survey Data Release Seven (SDSS DR7). Each algorithm is defined by a set of parameters which, when varied, produce different final classification trees. We extensively explore the parameter space of each algorithm, using the set of $884,126$ SDSS objects with spectroscopic data as the training set. The efficiency of star-galaxy separation is measured using the completeness function. We find that the Functional Tree algorithm (FT) yields the best re","authors_text":"E. C. Vasconcellos, F. L. LaBarbera, H. F. Campos Velho, H. V. Capelato, M. Trevisan, R. R. de Carvalho, R. R. Gal, R. S. R. Ruiz","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-09T00:47:01Z","title":"Decision Tree Classifiers for Star/Galaxy Separation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.1951","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:d95a657a68af84ba9d3f8b3b88a052d4c7a639a9bd524d3b842d0f3e87ffb838","target":"record","created_at":"2026-05-18T02:04:50Z","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":"8c841f9b00caf5b1e289f388301f8b3e775456d0758ae47e5a85e61deebc8807","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-09T00:47:01Z","title_canon_sha256":"9f05e1f5634d828dfcfe0ef2664a8e2898942360e2ddbac81a040e64d4f2d6be"},"schema_version":"1.0","source":{"id":"1011.1951","kind":"arxiv","version":1}},"canonical_sha256":"1d3442639975b95ed8b0d74ed102e7f546b6444d55148b50c734f5bcc1ccfdb9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1d3442639975b95ed8b0d74ed102e7f546b6444d55148b50c734f5bcc1ccfdb9","first_computed_at":"2026-05-18T02:04:50.177234Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:04:50.177234Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IIw3iryrLgvypnlHutYvcTZ6T9jt+hV06JIWJDZfeLpMLXXAiaRnEfCtJLGEz5nJBkCSNejaAbgjFGqQ4LU/BA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:04:50.177707Z","signed_message":"canonical_sha256_bytes"},"source_id":"1011.1951","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d95a657a68af84ba9d3f8b3b88a052d4c7a639a9bd524d3b842d0f3e87ffb838","sha256:32a0f874ad3da440a20c16193074f7bf5ee5ee789d1e76bae24b2ff615601a18"],"state_sha256":"87a5c8a597c284c49a9b2072435145d9e102e2b3b19d532aeeb7064cf3801a78"}