{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:CCJUCR3SVU25C2ABGXIXUFE7FS","short_pith_number":"pith:CCJUCR3S","canonical_record":{"source":{"id":"2102.08252","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-02-16T16:17:14Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"78553039718ba727751652eca0f962b7009c180fa8e5a2c72aa40a97737d91fe","abstract_canon_sha256":"4e4d0a349f9a916a33b70e729933d92487f006be47a91f360533012c3c387f18"},"schema_version":"1.0"},"canonical_sha256":"1093414772ad35d1680135d17a149f2c86a1b82f6c5d73eac9762c163dcdcb85","source":{"kind":"arxiv","id":"2102.08252","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.08252","created_at":"2026-07-05T02:21:46Z"},{"alias_kind":"arxiv_version","alias_value":"2102.08252v2","created_at":"2026-07-05T02:21:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.08252","created_at":"2026-07-05T02:21:46Z"},{"alias_kind":"pith_short_12","alias_value":"CCJUCR3SVU25","created_at":"2026-07-05T02:21:46Z"},{"alias_kind":"pith_short_16","alias_value":"CCJUCR3SVU25C2AB","created_at":"2026-07-05T02:21:46Z"},{"alias_kind":"pith_short_8","alias_value":"CCJUCR3S","created_at":"2026-07-05T02:21:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:CCJUCR3SVU25C2ABGXIXUFE7FS","target":"record","payload":{"canonical_record":{"source":{"id":"2102.08252","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-02-16T16:17:14Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"78553039718ba727751652eca0f962b7009c180fa8e5a2c72aa40a97737d91fe","abstract_canon_sha256":"4e4d0a349f9a916a33b70e729933d92487f006be47a91f360533012c3c387f18"},"schema_version":"1.0"},"canonical_sha256":"1093414772ad35d1680135d17a149f2c86a1b82f6c5d73eac9762c163dcdcb85","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:21:46.189951Z","signature_b64":"mEE0NtJlHh9LlkPEiHEtIolAYRxymg0NJ8Ecgx0Ik9pTzIF12z72RKtlfALkllRbYQe/PObbAM5Sd7DtuQMYCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1093414772ad35d1680135d17a149f2c86a1b82f6c5d73eac9762c163dcdcb85","last_reissued_at":"2026-07-05T02:21:46.189575Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:21:46.189575Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2102.08252","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":"2026-07-05T02:21:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Vw5GFyHEOqUJsTC2NbOBX3EhBWOLXcQfVsaBvbB0uftAuVaxhZ0JUG7hMWzFTA0XgCZsBH55DlojhUYqhSRXBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T12:21:07.801377Z"},"content_sha256":"303c0b464f0dc96023f2ffaeaafe9dce13195853a450c8a6cbef4ef44d0f22ac","schema_version":"1.0","event_id":"sha256:303c0b464f0dc96023f2ffaeaafe9dce13195853a450c8a6cbef4ef44d0f22ac"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:CCJUCR3SVU25C2ABGXIXUFE7FS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fanaroff-Riley classification of radio galaxies using group-equivariant convolutional neural networks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.IM","authors_text":"Anna M. M. Scaife, Fiona Porter","submitted_at":"2021-02-16T16:17:14Z","abstract_excerpt":"Weight sharing in convolutional neural networks (CNNs) ensures that their feature maps will be translation-equivariant. However, although conventional convolutions are equivariant to translation, they are not equivariant to other isometries of the input image data, such as rotation and reflection. For the classification of astronomical objects such as radio galaxies, which are expected statistically to be globally orientation invariant, this lack of dihedral equivariance means that a conventional CNN must learn explicitly to classify all rotated versions of a particular type of object individu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.08252","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/2102.08252/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":"2026-07-05T02:21:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RFjUef2NFRKPDZvwlozuvzaAUNAfrlce9ucLAFVAIk8co1fYcFCmt7sPDCPnLBvLikQz1tikukabW/rX3CzEDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T12:21:07.801908Z"},"content_sha256":"86ff33c0addbe41d0473da72dc3995abc632dfcb2597c607fcca579d22e2d411","schema_version":"1.0","event_id":"sha256:86ff33c0addbe41d0473da72dc3995abc632dfcb2597c607fcca579d22e2d411"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CCJUCR3SVU25C2ABGXIXUFE7FS/bundle.json","state_url":"https://pith.science/pith/CCJUCR3SVU25C2ABGXIXUFE7FS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CCJUCR3SVU25C2ABGXIXUFE7FS/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":"2026-08-09T12:21:07Z","links":{"resolver":"https://pith.science/pith/CCJUCR3SVU25C2ABGXIXUFE7FS","bundle":"https://pith.science/pith/CCJUCR3SVU25C2ABGXIXUFE7FS/bundle.json","state":"https://pith.science/pith/CCJUCR3SVU25C2ABGXIXUFE7FS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CCJUCR3SVU25C2ABGXIXUFE7FS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:CCJUCR3SVU25C2ABGXIXUFE7FS","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":"4e4d0a349f9a916a33b70e729933d92487f006be47a91f360533012c3c387f18","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-02-16T16:17:14Z","title_canon_sha256":"78553039718ba727751652eca0f962b7009c180fa8e5a2c72aa40a97737d91fe"},"schema_version":"1.0","source":{"id":"2102.08252","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.08252","created_at":"2026-07-05T02:21:46Z"},{"alias_kind":"arxiv_version","alias_value":"2102.08252v2","created_at":"2026-07-05T02:21:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.08252","created_at":"2026-07-05T02:21:46Z"},{"alias_kind":"pith_short_12","alias_value":"CCJUCR3SVU25","created_at":"2026-07-05T02:21:46Z"},{"alias_kind":"pith_short_16","alias_value":"CCJUCR3SVU25C2AB","created_at":"2026-07-05T02:21:46Z"},{"alias_kind":"pith_short_8","alias_value":"CCJUCR3S","created_at":"2026-07-05T02:21:46Z"}],"graph_snapshots":[{"event_id":"sha256:86ff33c0addbe41d0473da72dc3995abc632dfcb2597c607fcca579d22e2d411","target":"graph","created_at":"2026-07-05T02:21:46Z","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/2102.08252/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Weight sharing in convolutional neural networks (CNNs) ensures that their feature maps will be translation-equivariant. However, although conventional convolutions are equivariant to translation, they are not equivariant to other isometries of the input image data, such as rotation and reflection. For the classification of astronomical objects such as radio galaxies, which are expected statistically to be globally orientation invariant, this lack of dihedral equivariance means that a conventional CNN must learn explicitly to classify all rotated versions of a particular type of object individu","authors_text":"Anna M. M. Scaife, Fiona Porter","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-02-16T16:17:14Z","title":"Fanaroff-Riley classification of radio galaxies using group-equivariant convolutional neural networks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.08252","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":"sha256:303c0b464f0dc96023f2ffaeaafe9dce13195853a450c8a6cbef4ef44d0f22ac","target":"record","created_at":"2026-07-05T02:21:46Z","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":"4e4d0a349f9a916a33b70e729933d92487f006be47a91f360533012c3c387f18","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-02-16T16:17:14Z","title_canon_sha256":"78553039718ba727751652eca0f962b7009c180fa8e5a2c72aa40a97737d91fe"},"schema_version":"1.0","source":{"id":"2102.08252","kind":"arxiv","version":2}},"canonical_sha256":"1093414772ad35d1680135d17a149f2c86a1b82f6c5d73eac9762c163dcdcb85","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1093414772ad35d1680135d17a149f2c86a1b82f6c5d73eac9762c163dcdcb85","first_computed_at":"2026-07-05T02:21:46.189575Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:21:46.189575Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mEE0NtJlHh9LlkPEiHEtIolAYRxymg0NJ8Ecgx0Ik9pTzIF12z72RKtlfALkllRbYQe/PObbAM5Sd7DtuQMYCA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:21:46.189951Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.08252","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:303c0b464f0dc96023f2ffaeaafe9dce13195853a450c8a6cbef4ef44d0f22ac","sha256:86ff33c0addbe41d0473da72dc3995abc632dfcb2597c607fcca579d22e2d411"],"state_sha256":"c88a465107c357152849e17a68a99a9caec9c4da8ea78d2e47f5495b8b6d1145"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RScBuqRcaIPX3IkG6wy7xDKeGLt7TLhXwkBcDp3kFJHZMoOqTivUvFxqxmiaQzw1Rm0uqJGssH7uMgaKpKf7DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T12:21:07.805896Z","bundle_sha256":"59741ddca4eb0ddffc031eed58132969bbafdf999ccb0b5e3df8b2003bdd1e8d"}}