{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:QZLRK4ARZRFA56C7ES4XSPYWXR","short_pith_number":"pith:QZLRK4AR","canonical_record":{"source":{"id":"1811.11345","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2018-11-28T01:55:37Z","cross_cats_sorted":[],"title_canon_sha256":"e17527ec8c812ffb4cd44d7d2b828b1da28291fd5f0ea352e84a875b8a663e71","abstract_canon_sha256":"14b0c3dbbbe030ce26af1ccb93fcfa86a5c63db3901fdf62c7ffef2d04036e3e"},"schema_version":"1.0"},"canonical_sha256":"8657157011cc4a0ef85f24b9793f16bc5b67dae20060cf8556b9f1f133db240d","source":{"kind":"arxiv","id":"1811.11345","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.11345","created_at":"2026-05-17T23:59:44Z"},{"alias_kind":"arxiv_version","alias_value":"1811.11345v1","created_at":"2026-05-17T23:59:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.11345","created_at":"2026-05-17T23:59:44Z"},{"alias_kind":"pith_short_12","alias_value":"QZLRK4ARZRFA","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"QZLRK4ARZRFA56C7","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"QZLRK4AR","created_at":"2026-05-18T12:32:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:QZLRK4ARZRFA56C7ES4XSPYWXR","target":"record","payload":{"canonical_record":{"source":{"id":"1811.11345","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2018-11-28T01:55:37Z","cross_cats_sorted":[],"title_canon_sha256":"e17527ec8c812ffb4cd44d7d2b828b1da28291fd5f0ea352e84a875b8a663e71","abstract_canon_sha256":"14b0c3dbbbe030ce26af1ccb93fcfa86a5c63db3901fdf62c7ffef2d04036e3e"},"schema_version":"1.0"},"canonical_sha256":"8657157011cc4a0ef85f24b9793f16bc5b67dae20060cf8556b9f1f133db240d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:44.141911Z","signature_b64":"vx04L0WzuFaJASz1ajCDduYJQcE4WBit+FwtX7vs9ZVCLos4TGlt3VsDjLCmvQAUsCNmgg8Cn8USX/1hC1AcCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8657157011cc4a0ef85f24b9793f16bc5b67dae20060cf8556b9f1f133db240d","last_reissued_at":"2026-05-17T23:59:44.141440Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:44.141440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.11345","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":"2026-05-17T23:59:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lmwEgXT0MSphy1E/TbB0eOC6xD+e+sZPf/tozOP7LNSEvI9oDxqopL8pHJJJOL501oXpEpXE4OCiw802JOP8DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T06:08:23.459871Z"},"content_sha256":"ee8c4df1afa1b75f70f93378e8ce2cd42f401226631066789f754f28e4f53d5b","schema_version":"1.0","event_id":"sha256:ee8c4df1afa1b75f70f93378e8ce2cd42f401226631066789f754f28e4f53d5b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:QZLRK4ARZRFA56C7ES4XSPYWXR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Two-Dimensional (2D) Particle Swarms for Structure Selection of Nonlinear Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.SY","authors_text":"Akshya Swain, Eduardo MAM Mendes, Faizal Hafiz","submitted_at":"2018-11-28T01:55:37Z","abstract_excerpt":"The present study proposes a new structure selection approach for non-linear system identification based on Two-Dimensional particle swarms (2D-UPSO). The 2D learning framework essentially extends the learning dimension of the conventional particle swarms and explicitly incorporates the information about the cardinality, i.e., number of terms, into the search process. This property of the 2D-UPSO has been exploited to determine the correct structure of the non-linear systems. The efficacy of the proposed approach is demonstrated by considering several simulated benchmark nonlinear systems in d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.11345","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":"2026-05-17T23:59:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WNVnLPBN6myc8Uh1ZBMibGV3ZadgG6o06uCikwsHndiH8mJoRWCXDlCdc1HXDCdrKLGzhmrQdly3qNbmYWdeDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T06:08:23.460216Z"},"content_sha256":"39f27212538b84b242f8efce29cac01380b335e17090429d3d026c0ea59876dc","schema_version":"1.0","event_id":"sha256:39f27212538b84b242f8efce29cac01380b335e17090429d3d026c0ea59876dc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QZLRK4ARZRFA56C7ES4XSPYWXR/bundle.json","state_url":"https://pith.science/pith/QZLRK4ARZRFA56C7ES4XSPYWXR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QZLRK4ARZRFA56C7ES4XSPYWXR/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":"2026-06-23T06:08:23Z","links":{"resolver":"https://pith.science/pith/QZLRK4ARZRFA56C7ES4XSPYWXR","bundle":"https://pith.science/pith/QZLRK4ARZRFA56C7ES4XSPYWXR/bundle.json","state":"https://pith.science/pith/QZLRK4ARZRFA56C7ES4XSPYWXR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QZLRK4ARZRFA56C7ES4XSPYWXR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:QZLRK4ARZRFA56C7ES4XSPYWXR","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":"14b0c3dbbbe030ce26af1ccb93fcfa86a5c63db3901fdf62c7ffef2d04036e3e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2018-11-28T01:55:37Z","title_canon_sha256":"e17527ec8c812ffb4cd44d7d2b828b1da28291fd5f0ea352e84a875b8a663e71"},"schema_version":"1.0","source":{"id":"1811.11345","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.11345","created_at":"2026-05-17T23:59:44Z"},{"alias_kind":"arxiv_version","alias_value":"1811.11345v1","created_at":"2026-05-17T23:59:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.11345","created_at":"2026-05-17T23:59:44Z"},{"alias_kind":"pith_short_12","alias_value":"QZLRK4ARZRFA","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"QZLRK4ARZRFA56C7","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"QZLRK4AR","created_at":"2026-05-18T12:32:50Z"}],"graph_snapshots":[{"event_id":"sha256:39f27212538b84b242f8efce29cac01380b335e17090429d3d026c0ea59876dc","target":"graph","created_at":"2026-05-17T23:59:44Z","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":"The present study proposes a new structure selection approach for non-linear system identification based on Two-Dimensional particle swarms (2D-UPSO). The 2D learning framework essentially extends the learning dimension of the conventional particle swarms and explicitly incorporates the information about the cardinality, i.e., number of terms, into the search process. This property of the 2D-UPSO has been exploited to determine the correct structure of the non-linear systems. The efficacy of the proposed approach is demonstrated by considering several simulated benchmark nonlinear systems in d","authors_text":"Akshya Swain, Eduardo MAM Mendes, Faizal Hafiz","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2018-11-28T01:55:37Z","title":"Two-Dimensional (2D) Particle Swarms for Structure Selection of Nonlinear Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.11345","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:ee8c4df1afa1b75f70f93378e8ce2cd42f401226631066789f754f28e4f53d5b","target":"record","created_at":"2026-05-17T23:59:44Z","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":"14b0c3dbbbe030ce26af1ccb93fcfa86a5c63db3901fdf62c7ffef2d04036e3e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2018-11-28T01:55:37Z","title_canon_sha256":"e17527ec8c812ffb4cd44d7d2b828b1da28291fd5f0ea352e84a875b8a663e71"},"schema_version":"1.0","source":{"id":"1811.11345","kind":"arxiv","version":1}},"canonical_sha256":"8657157011cc4a0ef85f24b9793f16bc5b67dae20060cf8556b9f1f133db240d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8657157011cc4a0ef85f24b9793f16bc5b67dae20060cf8556b9f1f133db240d","first_computed_at":"2026-05-17T23:59:44.141440Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:44.141440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vx04L0WzuFaJASz1ajCDduYJQcE4WBit+FwtX7vs9ZVCLos4TGlt3VsDjLCmvQAUsCNmgg8Cn8USX/1hC1AcCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:44.141911Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.11345","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ee8c4df1afa1b75f70f93378e8ce2cd42f401226631066789f754f28e4f53d5b","sha256:39f27212538b84b242f8efce29cac01380b335e17090429d3d026c0ea59876dc"],"state_sha256":"5feabe7efcf84ff79822cb453e93067ab62de8528b9cba2f311e3815ef6ea0e3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WeHegnK71UtHCOOOxvyUMY2M75Nkm/YRTZvZ2zqWw3nEB560Sk8QNAVcyr2EvVXVTDqZudo0Btk/t2yKV2t1BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T06:08:23.462157Z","bundle_sha256":"bdde91c09b13c54eb60aa10b1256c163c86e22de9b4a2b2caab3ba284708375e"}}