{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:WQXR5OBM4KFRF5NL6L57FVVH5L","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":"1120a6d904c2f528a3eb77780f112d3c3eebbeaed39d85fc8c47569c289dc2c4","cross_cats_sorted":["astro-ph.CO","astro-ph.GA","cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-08-29T07:52:42Z","title_canon_sha256":"a74305f6a84763f4a15972d57a09098ebfa2f79e38796460e088acdd70699c01"},"schema_version":"1.0","source":{"id":"1808.09955","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.09955","created_at":"2026-05-18T00:06:50Z"},{"alias_kind":"arxiv_version","alias_value":"1808.09955v1","created_at":"2026-05-18T00:06:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.09955","created_at":"2026-05-18T00:06:50Z"},{"alias_kind":"pith_short_12","alias_value":"WQXR5OBM4KFR","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WQXR5OBM4KFRF5NL","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WQXR5OBM","created_at":"2026-05-18T12:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:1f9a75e860b27f151305cf13f52485e2354f717c2d03e250066a1b1a1a068927","target":"graph","created_at":"2026-05-18T00:06:50Z","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 introduce QuasarNET, a deep convolutional neural network that performs classification and redshift estimation of astrophysical spectra with human-expert accuracy. We pose these two tasks as a \\emph{feature detection} problem: presence or absence of spectral features determines the class, and their wavelength determines the redshift, very much like human-experts proceed. When ran on BOSS data to identify quasars through their emission lines, QuasarNET defines a sample $99.51\\pm0.03$\\% pure and $99.52\\pm0.03$\\% complete, well above the requirements of many analyses using these data. QuasarNET","authors_text":"Christophe Balland, Nicolas Busca","cross_cats":["astro-ph.CO","astro-ph.GA","cs.LG"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-08-29T07:52:42Z","title":"QuasarNET: Human-level spectral classification and redshifting with Deep Neural Networks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.09955","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":"sha256:013d9102bf4be51f69362a2f3f08c187f90b4a6c3a7f576e31801e19a790da68","target":"record","created_at":"2026-05-18T00:06:50Z","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":"1120a6d904c2f528a3eb77780f112d3c3eebbeaed39d85fc8c47569c289dc2c4","cross_cats_sorted":["astro-ph.CO","astro-ph.GA","cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-08-29T07:52:42Z","title_canon_sha256":"a74305f6a84763f4a15972d57a09098ebfa2f79e38796460e088acdd70699c01"},"schema_version":"1.0","source":{"id":"1808.09955","kind":"arxiv","version":1}},"canonical_sha256":"b42f1eb82ce28b12f5abf2fbf2d6a7eaf67089f7f0b964578c960ffff128345c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b42f1eb82ce28b12f5abf2fbf2d6a7eaf67089f7f0b964578c960ffff128345c","first_computed_at":"2026-05-18T00:06:50.307762Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:50.307762Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0M6xIENh9+mWjWFjRT+ZCrmx75mldQGHdZwUaWkB+G98iVhFG/H1H/KOsOKySNOQcNjjdox+QvvadS3PEv9LAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:50.308516Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.09955","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:013d9102bf4be51f69362a2f3f08c187f90b4a6c3a7f576e31801e19a790da68","sha256:1f9a75e860b27f151305cf13f52485e2354f717c2d03e250066a1b1a1a068927"],"state_sha256":"581116954cfb2ce4e82d46bb215acca1573c7409be4728e7ed7062e0e3f2f527"}