{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:XAUYHUVYTMRYR6YCNVGNNYHCNT","short_pith_number":"pith:XAUYHUVY","canonical_record":{"source":{"id":"2505.05625","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2025-05-08T20:03:30Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"2339a4c32fbb018a03bd15dee4526fb8128face748d2f71b648d2b0e476e6b65","abstract_canon_sha256":"cfa95c05ab42ec176ec0c63f9786f6d77556ceb400761ea9a1186d715cf2647b"},"schema_version":"1.0"},"canonical_sha256":"b82983d2b89b2388fb026d4cd6e0e26cd65e5eb5364c436356b9339318573589","source":{"kind":"arxiv","id":"2505.05625","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.05625","created_at":"2026-07-05T12:01:22Z"},{"alias_kind":"arxiv_version","alias_value":"2505.05625v3","created_at":"2026-07-05T12:01:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.05625","created_at":"2026-07-05T12:01:22Z"},{"alias_kind":"pith_short_12","alias_value":"XAUYHUVYTMRY","created_at":"2026-07-05T12:01:22Z"},{"alias_kind":"pith_short_16","alias_value":"XAUYHUVYTMRYR6YC","created_at":"2026-07-05T12:01:22Z"},{"alias_kind":"pith_short_8","alias_value":"XAUYHUVY","created_at":"2026-07-05T12:01:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:XAUYHUVYTMRYR6YCNVGNNYHCNT","target":"record","payload":{"canonical_record":{"source":{"id":"2505.05625","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2025-05-08T20:03:30Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"2339a4c32fbb018a03bd15dee4526fb8128face748d2f71b648d2b0e476e6b65","abstract_canon_sha256":"cfa95c05ab42ec176ec0c63f9786f6d77556ceb400761ea9a1186d715cf2647b"},"schema_version":"1.0"},"canonical_sha256":"b82983d2b89b2388fb026d4cd6e0e26cd65e5eb5364c436356b9339318573589","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T12:01:22.641305Z","signature_b64":"4ZhQ5Nnp3Ox6R8fRMyCR9KAqZXQZLYtH2UqwAAYoRpSHCVGRBBWnIu8WbYoVYtrKRssflki8tmsamcVAR0CICw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b82983d2b89b2388fb026d4cd6e0e26cd65e5eb5364c436356b9339318573589","last_reissued_at":"2026-07-05T12:01:22.640818Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T12:01:22.640818Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2505.05625","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T12:01:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qc1/s1EMC8fskA8OxwV5ror2b4CfJ3n8uy9T+F/QVuueJdoMAbsurPpXEd5bFM2dGUxjzG7eKcONwkxjGwfYBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T21:22:38.264707Z"},"content_sha256":"52e139bc04a513bb1fa6a17f5aefc92f9e0aef5ef0fdfdf0c2cf08b03079ae48","schema_version":"1.0","event_id":"sha256:52e139bc04a513bb1fa6a17f5aefc92f9e0aef5ef0fdfdf0c2cf08b03079ae48"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:XAUYHUVYTMRYR6YCNVGNNYHCNT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"SPIN-ODE: Stiff Physics-Informed Neural ODE for Chemical Reaction Rate Estimation","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI"],"primary_cat":"cs.LG","authors_text":"Michael Boy, Wenqing Peng, Zhi-Song Liu","submitted_at":"2025-05-08T20:03:30Z","abstract_excerpt":"Estimating rate coefficients from complex chemical reactions is essential for advancing detailed chemistry. However, the stiffness inherent in real-world atmospheric chemistry systems poses severe challenges, leading to training instability and poor convergence, which hinder effective rate coefficient estimation using learning-based approaches. To address this, we propose a Stiff Physics-Informed Neural ODE framework (SPIN-ODE) for chemical reaction modelling. Our method introduces a three-stage optimisation process: first, a black-box neural ODE is trained to fit concentration trajectories; s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.05625","kind":"arxiv","version":3},"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/2505.05625/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":"2026-07-05T12:01:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9Zi/R5hyzqM5SmuNiueWPon8TC5VbXJkpNaZnJTyz5wqjgtjn2b2HS9o200rCI4kknoQ9rRzS4/gr8FjXjDTAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T21:22:38.265228Z"},"content_sha256":"df48ab221631b64e98d5cf7fe591bb384d8973f6f0ae249bda4792cfb5f33922","schema_version":"1.0","event_id":"sha256:df48ab221631b64e98d5cf7fe591bb384d8973f6f0ae249bda4792cfb5f33922"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XAUYHUVYTMRYR6YCNVGNNYHCNT/bundle.json","state_url":"https://pith.science/pith/XAUYHUVYTMRYR6YCNVGNNYHCNT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XAUYHUVYTMRYR6YCNVGNNYHCNT/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":"2026-08-18T21:22:38Z","links":{"resolver":"https://pith.science/pith/XAUYHUVYTMRYR6YCNVGNNYHCNT","bundle":"https://pith.science/pith/XAUYHUVYTMRYR6YCNVGNNYHCNT/bundle.json","state":"https://pith.science/pith/XAUYHUVYTMRYR6YCNVGNNYHCNT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XAUYHUVYTMRYR6YCNVGNNYHCNT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:XAUYHUVYTMRYR6YCNVGNNYHCNT","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":"cfa95c05ab42ec176ec0c63f9786f6d77556ceb400761ea9a1186d715cf2647b","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2025-05-08T20:03:30Z","title_canon_sha256":"2339a4c32fbb018a03bd15dee4526fb8128face748d2f71b648d2b0e476e6b65"},"schema_version":"1.0","source":{"id":"2505.05625","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.05625","created_at":"2026-07-05T12:01:22Z"},{"alias_kind":"arxiv_version","alias_value":"2505.05625v3","created_at":"2026-07-05T12:01:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.05625","created_at":"2026-07-05T12:01:22Z"},{"alias_kind":"pith_short_12","alias_value":"XAUYHUVYTMRY","created_at":"2026-07-05T12:01:22Z"},{"alias_kind":"pith_short_16","alias_value":"XAUYHUVYTMRYR6YC","created_at":"2026-07-05T12:01:22Z"},{"alias_kind":"pith_short_8","alias_value":"XAUYHUVY","created_at":"2026-07-05T12:01:22Z"}],"graph_snapshots":[{"event_id":"sha256:df48ab221631b64e98d5cf7fe591bb384d8973f6f0ae249bda4792cfb5f33922","target":"graph","created_at":"2026-07-05T12:01:22Z","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/2505.05625/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Estimating rate coefficients from complex chemical reactions is essential for advancing detailed chemistry. However, the stiffness inherent in real-world atmospheric chemistry systems poses severe challenges, leading to training instability and poor convergence, which hinder effective rate coefficient estimation using learning-based approaches. To address this, we propose a Stiff Physics-Informed Neural ODE framework (SPIN-ODE) for chemical reaction modelling. Our method introduces a three-stage optimisation process: first, a black-box neural ODE is trained to fit concentration trajectories; s","authors_text":"Michael Boy, Wenqing Peng, Zhi-Song Liu","cross_cats":["cs.AI"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2025-05-08T20:03:30Z","title":"SPIN-ODE: Stiff Physics-Informed Neural ODE for Chemical Reaction Rate Estimation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.05625","kind":"arxiv","version":3},"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":"sha256:52e139bc04a513bb1fa6a17f5aefc92f9e0aef5ef0fdfdf0c2cf08b03079ae48","target":"record","created_at":"2026-07-05T12:01:22Z","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":"cfa95c05ab42ec176ec0c63f9786f6d77556ceb400761ea9a1186d715cf2647b","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2025-05-08T20:03:30Z","title_canon_sha256":"2339a4c32fbb018a03bd15dee4526fb8128face748d2f71b648d2b0e476e6b65"},"schema_version":"1.0","source":{"id":"2505.05625","kind":"arxiv","version":3}},"canonical_sha256":"b82983d2b89b2388fb026d4cd6e0e26cd65e5eb5364c436356b9339318573589","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b82983d2b89b2388fb026d4cd6e0e26cd65e5eb5364c436356b9339318573589","first_computed_at":"2026-07-05T12:01:22.640818Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T12:01:22.640818Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4ZhQ5Nnp3Ox6R8fRMyCR9KAqZXQZLYtH2UqwAAYoRpSHCVGRBBWnIu8WbYoVYtrKRssflki8tmsamcVAR0CICw==","signature_status":"signed_v1","signed_at":"2026-07-05T12:01:22.641305Z","signed_message":"canonical_sha256_bytes"},"source_id":"2505.05625","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:52e139bc04a513bb1fa6a17f5aefc92f9e0aef5ef0fdfdf0c2cf08b03079ae48","sha256:df48ab221631b64e98d5cf7fe591bb384d8973f6f0ae249bda4792cfb5f33922"],"state_sha256":"f7139a2b04411e730e0ec5cd06a9e43aaa60857d965c211b47431316ec23d5cd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wRaQy6toULwQ6XC2Qw8uqenO1ImMEPNOdFU0trB/uQ16PJmPaN0X/sNy2Zvd4FC0w80G68oAu8IC4zUICi5mCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T21:22:38.271464Z","bundle_sha256":"678d90a962c677cc26c1baf0f4482deee3b5339242dc10b04f5f7a58682981a0"}}