{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:W3WGEISOJW72ILFJQIIEN5PP4A","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":"306e4dd30a8280304bdad8be6e837595e59c3803585780500ab830252029cc78","cross_cats_sorted":["physics.ao-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2025-01-31T18:23:45Z","title_canon_sha256":"94dbdecb50000b69aa93dbb41eea348ffec9239c3d44fe7eb77c59d97894ecff"},"schema_version":"1.0","source":{"id":"2501.19374","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.19374","created_at":"2026-07-05T11:12:25Z"},{"alias_kind":"arxiv_version","alias_value":"2501.19374v2","created_at":"2026-07-05T11:12:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.19374","created_at":"2026-07-05T11:12:25Z"},{"alias_kind":"pith_short_12","alias_value":"W3WGEISOJW72","created_at":"2026-07-05T11:12:25Z"},{"alias_kind":"pith_short_16","alias_value":"W3WGEISOJW72ILFJ","created_at":"2026-07-05T11:12:25Z"},{"alias_kind":"pith_short_8","alias_value":"W3WGEISO","created_at":"2026-07-05T11:12:25Z"}],"graph_snapshots":[{"event_id":"sha256:7d7a18ea6a6f462a44b5987bd8fc14452d24258a99417e932b43bc3afd8db581","target":"graph","created_at":"2026-07-05T11:12:25Z","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/2501.19374/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Recent advancements in data-driven weather forecasting models have delivered deterministic models that outperform the leading operational forecast systems based on traditional, physics-based models. However, these data-driven models are typically trained with a mean squared error loss function, which causes smoothing of fine scales through a \"double penalty\" effect. We develop a simple, parameter-free modification to this loss function that avoids this problem by separating the loss attributable to decorrelation from the loss attributable to spectral amplitude errors. Fine-tuning the GraphCast","authors_text":"Christopher Subich, Jing Yang, Leo Separovic, Syed Zahid Husain","cross_cats":["physics.ao-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2025-01-31T18:23:45Z","title":"Fixing the Double Penalty in Data-Driven Weather Forecasting Through a Modified Spherical Harmonic Loss Function"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.19374","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":"sha256:7479044d4dd5cea074fc934857f0c5180197030d56221032db8fec58595d12d0","target":"record","created_at":"2026-07-05T11:12:25Z","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":"306e4dd30a8280304bdad8be6e837595e59c3803585780500ab830252029cc78","cross_cats_sorted":["physics.ao-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2025-01-31T18:23:45Z","title_canon_sha256":"94dbdecb50000b69aa93dbb41eea348ffec9239c3d44fe7eb77c59d97894ecff"},"schema_version":"1.0","source":{"id":"2501.19374","kind":"arxiv","version":2}},"canonical_sha256":"b6ec62224e4dbfa42ca9821046f5efe02b906e91b44cfcc94a3ec6f7c4b0907b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b6ec62224e4dbfa42ca9821046f5efe02b906e91b44cfcc94a3ec6f7c4b0907b","first_computed_at":"2026-07-05T11:12:25.122485Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:12:25.122485Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/cz5tsMT0HdSQfCuTgOpGT8IvtV9qOVYuw8OoKZfEBv1h7KYoKwkfWQaM/J6m5yAQl68CmQIQfMWbf9z4a1PAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:12:25.123066Z","signed_message":"canonical_sha256_bytes"},"source_id":"2501.19374","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7479044d4dd5cea074fc934857f0c5180197030d56221032db8fec58595d12d0","sha256:7d7a18ea6a6f462a44b5987bd8fc14452d24258a99417e932b43bc3afd8db581"],"state_sha256":"999fa5e2f481a3eb2435621be099d360701053509400f18d181a166b4614951a"}