{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:USBWQLMJQ5YI4H5GXIA2BAUX4P","short_pith_number":"pith:USBWQLMJ","canonical_record":{"source":{"id":"1705.06818","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-18T22:28:27Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"1878f4d1fe407fc25adb19f72fca0c707deb7d6787f20d57bad608a273e8e68f","abstract_canon_sha256":"aabf34c3af643ae68381fd93de28c213065e69dac1381a6143bd25cca9ea20ea"},"schema_version":"1.0"},"canonical_sha256":"a483682d8987708e1fa6ba01a08297e3e732c0688a0abfe28f2cdd3054f294be","source":{"kind":"arxiv","id":"1705.06818","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.06818","created_at":"2026-05-18T00:44:11Z"},{"alias_kind":"arxiv_version","alias_value":"1705.06818v1","created_at":"2026-05-18T00:44:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.06818","created_at":"2026-05-18T00:44:11Z"},{"alias_kind":"pith_short_12","alias_value":"USBWQLMJQ5YI","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_16","alias_value":"USBWQLMJQ5YI4H5G","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_8","alias_value":"USBWQLMJ","created_at":"2026-05-18T12:31:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:USBWQLMJQ5YI4H5GXIA2BAUX4P","target":"record","payload":{"canonical_record":{"source":{"id":"1705.06818","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-18T22:28:27Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"1878f4d1fe407fc25adb19f72fca0c707deb7d6787f20d57bad608a273e8e68f","abstract_canon_sha256":"aabf34c3af643ae68381fd93de28c213065e69dac1381a6143bd25cca9ea20ea"},"schema_version":"1.0"},"canonical_sha256":"a483682d8987708e1fa6ba01a08297e3e732c0688a0abfe28f2cdd3054f294be","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:44:11.227360Z","signature_b64":"Dm4LWXQt8ylHACpYCNtuHVn158sZl0jGZv5v/L4g9Krb8pWhyNTgD5ArmgcnYXkxYEJW3FyBec4WPqeES7VoCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a483682d8987708e1fa6ba01a08297e3e732c0688a0abfe28f2cdd3054f294be","last_reissued_at":"2026-05-18T00:44:11.226868Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:44:11.226868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1705.06818","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":"2026-05-18T00:44:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZSj0du0hvEkI2+8QRLW+HcWLyIeELqqa8QF3yVvC2HUc8tMtFmbigCyLj5fZGWHJfcyP/dCTNfLdTAnurN1YBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T22:36:41.371481Z"},"content_sha256":"5eaaa2b270b67a91bf9919c641a2c3f6c2de65e540662ab51381a4a09ad5af13","schema_version":"1.0","event_id":"sha256:5eaaa2b270b67a91bf9919c641a2c3f6c2de65e540662ab51381a4a09ad5af13"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:USBWQLMJQ5YI4H5GXIA2BAUX4P","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Improving galaxy morphology with machine learning","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.GA","authors_text":"D. H. Stalder, F. G. da Costa, P. H. Barchi, R. R. de Carvalho, R. R. Rosa, R. Sautter, T. C. Moura","submitted_at":"2017-05-18T22:28:27Z","abstract_excerpt":"This paper presents machine learning experiments performed over results of galaxy classification into elliptical (E) and spiral (S) with morphological parameters: concetration (CN), assimetry metrics (A3), smoothness metrics (S3), entropy (H) and gradient pattern analysis parameter (GA). Except concentration, all parameters performed a image segmentation pre-processing. For supervision and to compute confusion matrices, we used as true label the galaxy classification from GalaxyZoo. With a 48145 objects dataset after preprocessing (44760 galaxies labeled as S and 3385 as E), we performed exper"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.06818","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":"2026-05-18T00:44:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dq90u4gp/EV0eAo0+38INtYeHEu2/g39eb1fFRewMCzVYSDoN7ybrkByz1Kgf+/FcrjMGUbWfUmGPZeqmASLCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T22:36:41.371828Z"},"content_sha256":"98ebba23c3e55212206187d750ec7677253d6f1f211157246c3747a7855e5a9f","schema_version":"1.0","event_id":"sha256:98ebba23c3e55212206187d750ec7677253d6f1f211157246c3747a7855e5a9f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/USBWQLMJQ5YI4H5GXIA2BAUX4P/bundle.json","state_url":"https://pith.science/pith/USBWQLMJQ5YI4H5GXIA2BAUX4P/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/USBWQLMJQ5YI4H5GXIA2BAUX4P/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":"2026-07-01T22:36:41Z","links":{"resolver":"https://pith.science/pith/USBWQLMJQ5YI4H5GXIA2BAUX4P","bundle":"https://pith.science/pith/USBWQLMJQ5YI4H5GXIA2BAUX4P/bundle.json","state":"https://pith.science/pith/USBWQLMJQ5YI4H5GXIA2BAUX4P/state.json","well_known_bundle":"https://pith.science/.well-known/pith/USBWQLMJQ5YI4H5GXIA2BAUX4P/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:USBWQLMJQ5YI4H5GXIA2BAUX4P","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":"aabf34c3af643ae68381fd93de28c213065e69dac1381a6143bd25cca9ea20ea","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-18T22:28:27Z","title_canon_sha256":"1878f4d1fe407fc25adb19f72fca0c707deb7d6787f20d57bad608a273e8e68f"},"schema_version":"1.0","source":{"id":"1705.06818","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.06818","created_at":"2026-05-18T00:44:11Z"},{"alias_kind":"arxiv_version","alias_value":"1705.06818v1","created_at":"2026-05-18T00:44:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.06818","created_at":"2026-05-18T00:44:11Z"},{"alias_kind":"pith_short_12","alias_value":"USBWQLMJQ5YI","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_16","alias_value":"USBWQLMJQ5YI4H5G","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_8","alias_value":"USBWQLMJ","created_at":"2026-05-18T12:31:49Z"}],"graph_snapshots":[{"event_id":"sha256:98ebba23c3e55212206187d750ec7677253d6f1f211157246c3747a7855e5a9f","target":"graph","created_at":"2026-05-18T00:44:11Z","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":"This paper presents machine learning experiments performed over results of galaxy classification into elliptical (E) and spiral (S) with morphological parameters: concetration (CN), assimetry metrics (A3), smoothness metrics (S3), entropy (H) and gradient pattern analysis parameter (GA). Except concentration, all parameters performed a image segmentation pre-processing. For supervision and to compute confusion matrices, we used as true label the galaxy classification from GalaxyZoo. With a 48145 objects dataset after preprocessing (44760 galaxies labeled as S and 3385 as E), we performed exper","authors_text":"D. H. Stalder, F. G. da Costa, P. H. Barchi, R. R. de Carvalho, R. R. Rosa, R. Sautter, T. C. Moura","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-18T22:28:27Z","title":"Improving galaxy morphology with machine learning"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.06818","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":"sha256:5eaaa2b270b67a91bf9919c641a2c3f6c2de65e540662ab51381a4a09ad5af13","target":"record","created_at":"2026-05-18T00:44:11Z","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":"aabf34c3af643ae68381fd93de28c213065e69dac1381a6143bd25cca9ea20ea","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-18T22:28:27Z","title_canon_sha256":"1878f4d1fe407fc25adb19f72fca0c707deb7d6787f20d57bad608a273e8e68f"},"schema_version":"1.0","source":{"id":"1705.06818","kind":"arxiv","version":1}},"canonical_sha256":"a483682d8987708e1fa6ba01a08297e3e732c0688a0abfe28f2cdd3054f294be","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a483682d8987708e1fa6ba01a08297e3e732c0688a0abfe28f2cdd3054f294be","first_computed_at":"2026-05-18T00:44:11.226868Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:44:11.226868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Dm4LWXQt8ylHACpYCNtuHVn158sZl0jGZv5v/L4g9Krb8pWhyNTgD5ArmgcnYXkxYEJW3FyBec4WPqeES7VoCg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:44:11.227360Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.06818","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5eaaa2b270b67a91bf9919c641a2c3f6c2de65e540662ab51381a4a09ad5af13","sha256:98ebba23c3e55212206187d750ec7677253d6f1f211157246c3747a7855e5a9f"],"state_sha256":"1ac82f9680e9c243b64681ca3ee63092132ded5cd4d455a31381c7c2924b7b06"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lzQV3hwsN4fLg+tziT58qCbk2bWOSgNC86mDHMyw/38r0mGvO70lvZqNYsIk+l8G3/7TIA8E/I85SASlOZ65Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-01T22:36:41.373803Z","bundle_sha256":"909e72ceb6fcf4680e26bf311c5635eb537c947699a12104951bc3845eda1a20"}}