{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:HMTT4LOWSSHROMPPV7JHA6HEJS","short_pith_number":"pith:HMTT4LOW","canonical_record":{"source":{"id":"1305.5023","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-05-22T05:35:47Z","cross_cats_sorted":[],"title_canon_sha256":"b637253917839fbd33abd8cab136f6932c301995ff488f5b0a29b64e953c66f3","abstract_canon_sha256":"01436998307919eff927062d7b103bd1ae52150327864a51e89e01ff7ab2b19b"},"schema_version":"1.0"},"canonical_sha256":"3b273e2dd6948f1731efafd27078e44cbdbb75275463f4c509b65590a259f4ea","source":{"kind":"arxiv","id":"1305.5023","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.5023","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"arxiv_version","alias_value":"1305.5023v1","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.5023","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"pith_short_12","alias_value":"HMTT4LOWSSHR","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"HMTT4LOWSSHROMPP","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"HMTT4LOW","created_at":"2026-05-18T12:27:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:HMTT4LOWSSHROMPPV7JHA6HEJS","target":"record","payload":{"canonical_record":{"source":{"id":"1305.5023","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-05-22T05:35:47Z","cross_cats_sorted":[],"title_canon_sha256":"b637253917839fbd33abd8cab136f6932c301995ff488f5b0a29b64e953c66f3","abstract_canon_sha256":"01436998307919eff927062d7b103bd1ae52150327864a51e89e01ff7ab2b19b"},"schema_version":"1.0"},"canonical_sha256":"3b273e2dd6948f1731efafd27078e44cbdbb75275463f4c509b65590a259f4ea","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:48:21.103047Z","signature_b64":"ImVQwL2oQj4SgDB5ovpWcZgPFRJY6DKaY57gBCPsKrKYjFtfpFCivMqdvWI2gl//Gztbru079wTuuhM6DeXmDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3b273e2dd6948f1731efafd27078e44cbdbb75275463f4c509b65590a259f4ea","last_reissued_at":"2026-05-18T00:48:21.102563Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:48:21.102563Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1305.5023","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":"2026-05-18T00:48:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oWKqolMyWPWa3Do6fGi5ZiNzELkjRVwwtDw7GTBZgTcP5H3V6aGpAyCSQgWcgDrKBlbED0fdn8QUcF5ETfPWAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T02:16:48.430621Z"},"content_sha256":"8ace415cc788a3036a2ef9889939a46bcae57784d0a65ca5cce2669ba89cb535","schema_version":"1.0","event_id":"sha256:8ace415cc788a3036a2ef9889939a46bcae57784d0a65ca5cce2669ba89cb535"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:HMTT4LOWSSHROMPPV7JHA6HEJS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Estimating Photometric Redshifts of Quasars via K-nearest Neighbor Approach Based on Large Survey Databases","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Ma He, Peng Nanbo, Wu Xue-Bing, Zhang Yanxia, Zhao YongHeng","submitted_at":"2013-05-22T05:35:47Z","abstract_excerpt":"We apply one of lazy learning methods named k-nearest neighbor algorithm (kNN) to estimate the photometric redshifts of quasars, based on various datasets from the Sloan Digital Sky Survey (SDSS), UKIRT Infrared Deep Sky Survey (UKIDSS) and Wide-field Infrared Survey Explorer (WISE) (the SDSS sample, the SDSS-UKIDSS sample, the SDSS-WISE sample and the SDSS-UKIDSS-WISE sample). The influence of the k value and different input patterns on the performance of kNN is discussed. kNN arrives at the best performance when k is different with a special input pattern for a special dataset. The best resu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.5023","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":""},"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":"2026-05-18T00:48:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zzgykxRl69W5Y1pMFMub3iWKWjuSztYb4OvVQyRdJxMMYqayIW9OG7Rb70wbh+EtNzz7jqgZAYPk5l1uJKYpAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T02:16:48.430971Z"},"content_sha256":"955803e72b5b60c4ee2c6b16008ed80e523a60c1b1ce0d73cfaed063c8ecc490","schema_version":"1.0","event_id":"sha256:955803e72b5b60c4ee2c6b16008ed80e523a60c1b1ce0d73cfaed063c8ecc490"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HMTT4LOWSSHROMPPV7JHA6HEJS/bundle.json","state_url":"https://pith.science/pith/HMTT4LOWSSHROMPPV7JHA6HEJS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HMTT4LOWSSHROMPPV7JHA6HEJS/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":"2026-06-03T02:16:48Z","links":{"resolver":"https://pith.science/pith/HMTT4LOWSSHROMPPV7JHA6HEJS","bundle":"https://pith.science/pith/HMTT4LOWSSHROMPPV7JHA6HEJS/bundle.json","state":"https://pith.science/pith/HMTT4LOWSSHROMPPV7JHA6HEJS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HMTT4LOWSSHROMPPV7JHA6HEJS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:HMTT4LOWSSHROMPPV7JHA6HEJS","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":"01436998307919eff927062d7b103bd1ae52150327864a51e89e01ff7ab2b19b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-05-22T05:35:47Z","title_canon_sha256":"b637253917839fbd33abd8cab136f6932c301995ff488f5b0a29b64e953c66f3"},"schema_version":"1.0","source":{"id":"1305.5023","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.5023","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"arxiv_version","alias_value":"1305.5023v1","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.5023","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"pith_short_12","alias_value":"HMTT4LOWSSHR","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"HMTT4LOWSSHROMPP","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"HMTT4LOW","created_at":"2026-05-18T12:27:46Z"}],"graph_snapshots":[{"event_id":"sha256:955803e72b5b60c4ee2c6b16008ed80e523a60c1b1ce0d73cfaed063c8ecc490","target":"graph","created_at":"2026-05-18T00:48:21Z","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 apply one of lazy learning methods named k-nearest neighbor algorithm (kNN) to estimate the photometric redshifts of quasars, based on various datasets from the Sloan Digital Sky Survey (SDSS), UKIRT Infrared Deep Sky Survey (UKIDSS) and Wide-field Infrared Survey Explorer (WISE) (the SDSS sample, the SDSS-UKIDSS sample, the SDSS-WISE sample and the SDSS-UKIDSS-WISE sample). The influence of the k value and different input patterns on the performance of kNN is discussed. kNN arrives at the best performance when k is different with a special input pattern for a special dataset. The best resu","authors_text":"Ma He, Peng Nanbo, Wu Xue-Bing, Zhang Yanxia, Zhao YongHeng","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-05-22T05:35:47Z","title":"Estimating Photometric Redshifts of Quasars via K-nearest Neighbor Approach Based on Large Survey Databases"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.5023","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":"sha256:8ace415cc788a3036a2ef9889939a46bcae57784d0a65ca5cce2669ba89cb535","target":"record","created_at":"2026-05-18T00:48:21Z","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":"01436998307919eff927062d7b103bd1ae52150327864a51e89e01ff7ab2b19b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-05-22T05:35:47Z","title_canon_sha256":"b637253917839fbd33abd8cab136f6932c301995ff488f5b0a29b64e953c66f3"},"schema_version":"1.0","source":{"id":"1305.5023","kind":"arxiv","version":1}},"canonical_sha256":"3b273e2dd6948f1731efafd27078e44cbdbb75275463f4c509b65590a259f4ea","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3b273e2dd6948f1731efafd27078e44cbdbb75275463f4c509b65590a259f4ea","first_computed_at":"2026-05-18T00:48:21.102563Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:48:21.102563Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ImVQwL2oQj4SgDB5ovpWcZgPFRJY6DKaY57gBCPsKrKYjFtfpFCivMqdvWI2gl//Gztbru079wTuuhM6DeXmDg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:48:21.103047Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.5023","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8ace415cc788a3036a2ef9889939a46bcae57784d0a65ca5cce2669ba89cb535","sha256:955803e72b5b60c4ee2c6b16008ed80e523a60c1b1ce0d73cfaed063c8ecc490"],"state_sha256":"210119c0724797cdc7a7c7474b3e043b8b08c3342996570f23b892a6adc7aa97"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WeqZlUKsUtejBMlyDjh5afqzVmz/IWRsOhjY1NsMpdgaEpGMZlsOOPQZR51Mcl6SfV5TSQMCu/xYHgJhGBT7Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T02:16:48.432904Z","bundle_sha256":"d65b8a5db6151bf3439341f00f829a7da2d5e6fff458220f0fb4b61a44aa3a1d"}}