{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:SMVKJYVQEFMQFNPPK63NUJRTAD","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":"9aa829390ba1edf9051dcfaca371055db766c7d54f672e580c129f8449651d59","cross_cats_sorted":["cs.CY","math.NA","math.OC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2014-02-11T11:26:34Z","title_canon_sha256":"989d0a97b7441c01ffabff116645dde6a9b6540cbce270cf980e1dde9da5f95a"},"schema_version":"1.0","source":{"id":"1402.2455","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.2455","created_at":"2026-05-17T23:49:44Z"},{"alias_kind":"arxiv_version","alias_value":"1402.2455v1","created_at":"2026-05-17T23:49:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.2455","created_at":"2026-05-17T23:49:44Z"},{"alias_kind":"pith_short_12","alias_value":"SMVKJYVQEFMQ","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"SMVKJYVQEFMQFNPP","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"SMVKJYVQ","created_at":"2026-05-18T12:28:49Z"}],"graph_snapshots":[{"event_id":"sha256:9b6e3411942ac0bb64ee1a4448e7054506d9b0555a08bda5f3029bb208fbaa16","target":"graph","created_at":"2026-05-17T23:49:44Z","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 maximum likelihood model in emission tomography and propose a new family of algorithms for its solution, called String-Averaging Expectation-Maximization (SAEM). In the String-Averaging algorithmic regime, the index set of all underlying equations is split into subsets, called \"strings,\" and the algorithm separately proceeds along each string, possibly in parallel. Then, the end-points of all strings are averaged to form the next iterate. SAEM algorithms with several strings presents better practical merits than the classical Row-Action Maximum-Likelihood Algorithm (RAMLA). We pre","authors_text":"\\'A. R. De Pierro, E. S. Helou, H. H.-S. Lu, I-L. Chern, M. Jiang, T.-B. Chen, Y. Censor","cross_cats":["cs.CY","math.NA","math.OC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2014-02-11T11:26:34Z","title":"String-Averaging Expectation-Maximization for Maximum Likelihood Estimation in Emission Tomography"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.2455","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":"sha256:85921b116755deed3c7b585732dd17e5c7a195d2c7e952f179b527073810c665","target":"record","created_at":"2026-05-17T23:49:44Z","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":"9aa829390ba1edf9051dcfaca371055db766c7d54f672e580c129f8449651d59","cross_cats_sorted":["cs.CY","math.NA","math.OC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2014-02-11T11:26:34Z","title_canon_sha256":"989d0a97b7441c01ffabff116645dde6a9b6540cbce270cf980e1dde9da5f95a"},"schema_version":"1.0","source":{"id":"1402.2455","kind":"arxiv","version":1}},"canonical_sha256":"932aa4e2b0215902b5ef57b6da263300f43d5205f0522955718b79a5d4405b13","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"932aa4e2b0215902b5ef57b6da263300f43d5205f0522955718b79a5d4405b13","first_computed_at":"2026-05-17T23:49:44.636868Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:44.636868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uAM1F0j8Li8qr2SU4AGcQ3myFnO6pTzSZrouNPsxKFPwoPrAkSv7gxF6VTBT8nqVP+kn1nAIAJtopyGu2ii3Bw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:44.637377Z","signed_message":"canonical_sha256_bytes"},"source_id":"1402.2455","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:85921b116755deed3c7b585732dd17e5c7a195d2c7e952f179b527073810c665","sha256:9b6e3411942ac0bb64ee1a4448e7054506d9b0555a08bda5f3029bb208fbaa16"],"state_sha256":"15db0271ee0c4e1562157ab3fd367820e47ae894a4688a8afa857ff9617ddd92"}