{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:YWSMCQGQNSZZZWC76P6J6V4L5C","short_pith_number":"pith:YWSMCQGQ","canonical_record":{"source":{"id":"2309.11808","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2023-09-21T06:28:07Z","cross_cats_sorted":["cs.DC","cs.MS"],"title_canon_sha256":"bd08142d04a3e1f1255991041517db8ab064cea55754af249b7ccd191b37643c","abstract_canon_sha256":"4d4b1cdf59012b0172d134573af745c7c630cab7faeb238ec9208b1482994f26"},"schema_version":"1.0"},"canonical_sha256":"c5a4c140d06cb39cd85ff3fc9f578be89c3ee12e4d09e0ff406bedb9eedbfaf4","source":{"kind":"arxiv","id":"2309.11808","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.11808","created_at":"2026-07-05T08:50:24Z"},{"alias_kind":"arxiv_version","alias_value":"2309.11808v2","created_at":"2026-07-05T08:50:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.11808","created_at":"2026-07-05T08:50:24Z"},{"alias_kind":"pith_short_12","alias_value":"YWSMCQGQNSZZ","created_at":"2026-07-05T08:50:24Z"},{"alias_kind":"pith_short_16","alias_value":"YWSMCQGQNSZZZWC7","created_at":"2026-07-05T08:50:24Z"},{"alias_kind":"pith_short_8","alias_value":"YWSMCQGQ","created_at":"2026-07-05T08:50:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:YWSMCQGQNSZZZWC76P6J6V4L5C","target":"record","payload":{"canonical_record":{"source":{"id":"2309.11808","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2023-09-21T06:28:07Z","cross_cats_sorted":["cs.DC","cs.MS"],"title_canon_sha256":"bd08142d04a3e1f1255991041517db8ab064cea55754af249b7ccd191b37643c","abstract_canon_sha256":"4d4b1cdf59012b0172d134573af745c7c630cab7faeb238ec9208b1482994f26"},"schema_version":"1.0"},"canonical_sha256":"c5a4c140d06cb39cd85ff3fc9f578be89c3ee12e4d09e0ff406bedb9eedbfaf4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:50:24.734028Z","signature_b64":"qdPINZX1caNxpzzKXtdhQ+aFD0h4xC+COlU2DjSVQJPcsqrCV6UN/8fg1Psq2tYQnPLcBgvgD5gDUbxHaQJhBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c5a4c140d06cb39cd85ff3fc9f578be89c3ee12e4d09e0ff406bedb9eedbfaf4","last_reissued_at":"2026-07-05T08:50:24.733602Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:50:24.733602Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2309.11808","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T08:50:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8yl9YuFzegyF+7oDZXjmODqwpua39h+BVomyisGpQ/FMBtWgT0ZMUlOM1rgv8dODS+Cjr7dM7Hl+2Vq/aZeLCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T23:16:58.457753Z"},"content_sha256":"5e66e24dfa810c50b9ce6f9f4d75c6eb6147c315ab814703dffd3f634ddeb05e","schema_version":"1.0","event_id":"sha256:5e66e24dfa810c50b9ce6f9f4d75c6eb6147c315ab814703dffd3f634ddeb05e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:YWSMCQGQNSZZZWC76P6J6V4L5C","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Unlocking massively parallel spectral proper orthogonal decompositions in the PySPOD package","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.DC","cs.MS"],"primary_cat":"physics.comp-ph","authors_text":"Brandon C. Y. Yeung, Gianmarco Mengaldo, Lisandro Dalcin, Marcin Rogowski, Matteo Parsani, Oliver T. Schmidt, Romit Maulik","submitted_at":"2023-09-21T06:28:07Z","abstract_excerpt":"We propose a parallel (distributed) version of the spectral proper orthogonal decomposition (SPOD) technique. The parallel SPOD algorithm distributes the spatial dimension of the dataset preserving time. This approach is adopted to preserve the non-distributed fast Fourier transform of the data in time, thereby avoiding the associated bottlenecks. The parallel SPOD algorithm is implemented in the PySPOD (https://github.com/MathEXLab/PySPOD) library and makes use of the standard message passing interface (MPI) library, implemented in Python via mpi4py (https://mpi4py.readthedocs.io/en/stable/)."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.11808","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2309.11808/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T08:50:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d29wteHwaI2J6CYNj1VmIs31m88INuxJ7zrRx14ibc4Be0ivyr8JKKVVgEnfP12V5GWtq7oi8Jo88iNUWbq/DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T23:16:58.458313Z"},"content_sha256":"a4cea594e287ed118819eb8943247c4dbdda5b46c6a9f946ed7cbeaf175736cf","schema_version":"1.0","event_id":"sha256:a4cea594e287ed118819eb8943247c4dbdda5b46c6a9f946ed7cbeaf175736cf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YWSMCQGQNSZZZWC76P6J6V4L5C/bundle.json","state_url":"https://pith.science/pith/YWSMCQGQNSZZZWC76P6J6V4L5C/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YWSMCQGQNSZZZWC76P6J6V4L5C/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":"2026-08-05T23:16:58Z","links":{"resolver":"https://pith.science/pith/YWSMCQGQNSZZZWC76P6J6V4L5C","bundle":"https://pith.science/pith/YWSMCQGQNSZZZWC76P6J6V4L5C/bundle.json","state":"https://pith.science/pith/YWSMCQGQNSZZZWC76P6J6V4L5C/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YWSMCQGQNSZZZWC76P6J6V4L5C/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:YWSMCQGQNSZZZWC76P6J6V4L5C","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":"4d4b1cdf59012b0172d134573af745c7c630cab7faeb238ec9208b1482994f26","cross_cats_sorted":["cs.DC","cs.MS"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2023-09-21T06:28:07Z","title_canon_sha256":"bd08142d04a3e1f1255991041517db8ab064cea55754af249b7ccd191b37643c"},"schema_version":"1.0","source":{"id":"2309.11808","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.11808","created_at":"2026-07-05T08:50:24Z"},{"alias_kind":"arxiv_version","alias_value":"2309.11808v2","created_at":"2026-07-05T08:50:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.11808","created_at":"2026-07-05T08:50:24Z"},{"alias_kind":"pith_short_12","alias_value":"YWSMCQGQNSZZ","created_at":"2026-07-05T08:50:24Z"},{"alias_kind":"pith_short_16","alias_value":"YWSMCQGQNSZZZWC7","created_at":"2026-07-05T08:50:24Z"},{"alias_kind":"pith_short_8","alias_value":"YWSMCQGQ","created_at":"2026-07-05T08:50:24Z"}],"graph_snapshots":[{"event_id":"sha256:a4cea594e287ed118819eb8943247c4dbdda5b46c6a9f946ed7cbeaf175736cf","target":"graph","created_at":"2026-07-05T08:50:24Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2309.11808/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We propose a parallel (distributed) version of the spectral proper orthogonal decomposition (SPOD) technique. The parallel SPOD algorithm distributes the spatial dimension of the dataset preserving time. This approach is adopted to preserve the non-distributed fast Fourier transform of the data in time, thereby avoiding the associated bottlenecks. The parallel SPOD algorithm is implemented in the PySPOD (https://github.com/MathEXLab/PySPOD) library and makes use of the standard message passing interface (MPI) library, implemented in Python via mpi4py (https://mpi4py.readthedocs.io/en/stable/).","authors_text":"Brandon C. Y. Yeung, Gianmarco Mengaldo, Lisandro Dalcin, Marcin Rogowski, Matteo Parsani, Oliver T. Schmidt, Romit Maulik","cross_cats":["cs.DC","cs.MS"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2023-09-21T06:28:07Z","title":"Unlocking massively parallel spectral proper orthogonal decompositions in the PySPOD package"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.11808","kind":"arxiv","version":2},"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":"sha256:5e66e24dfa810c50b9ce6f9f4d75c6eb6147c315ab814703dffd3f634ddeb05e","target":"record","created_at":"2026-07-05T08:50:24Z","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":"4d4b1cdf59012b0172d134573af745c7c630cab7faeb238ec9208b1482994f26","cross_cats_sorted":["cs.DC","cs.MS"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2023-09-21T06:28:07Z","title_canon_sha256":"bd08142d04a3e1f1255991041517db8ab064cea55754af249b7ccd191b37643c"},"schema_version":"1.0","source":{"id":"2309.11808","kind":"arxiv","version":2}},"canonical_sha256":"c5a4c140d06cb39cd85ff3fc9f578be89c3ee12e4d09e0ff406bedb9eedbfaf4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c5a4c140d06cb39cd85ff3fc9f578be89c3ee12e4d09e0ff406bedb9eedbfaf4","first_computed_at":"2026-07-05T08:50:24.733602Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:50:24.733602Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qdPINZX1caNxpzzKXtdhQ+aFD0h4xC+COlU2DjSVQJPcsqrCV6UN/8fg1Psq2tYQnPLcBgvgD5gDUbxHaQJhBw==","signature_status":"signed_v1","signed_at":"2026-07-05T08:50:24.734028Z","signed_message":"canonical_sha256_bytes"},"source_id":"2309.11808","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5e66e24dfa810c50b9ce6f9f4d75c6eb6147c315ab814703dffd3f634ddeb05e","sha256:a4cea594e287ed118819eb8943247c4dbdda5b46c6a9f946ed7cbeaf175736cf"],"state_sha256":"468fd9fd8b3ae268115cec1c72dc455641a022117e2455a454f93986c1057c3b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m/jnfe/uuz+ruxUncXeI+PK0fQbBFGHk8HzvyhNjWZQDz1Tgd7xtBTtr5l8+deCu7Cg2a3OS/2Vn5+/nhDCOAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T23:16:58.463143Z","bundle_sha256":"95d3e219501a128cf16f79ba9dbe26957214141e5da19b904faa133331c6bda4"}}