{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:H33RYFO7DIXBS52JC2WCTJYGZL","short_pith_number":"pith:H33RYFO7","canonical_record":{"source":{"id":"2012.08097","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2020-12-15T05:21:50Z","cross_cats_sorted":[],"title_canon_sha256":"6b459f2c215951277634de0ae53d9e277e850726080700177147a961af93457f","abstract_canon_sha256":"19686f5dc3176bf0ea8bb4f7331c9b757c5c26be11fa903694964b33a53b80e5"},"schema_version":"1.0"},"canonical_sha256":"3ef71c15df1a2e19774916ac29a706caed7cfa0222d74df8b4fa75e7e9b760aa","source":{"kind":"arxiv","id":"2012.08097","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.08097","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"arxiv_version","alias_value":"2012.08097v1","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.08097","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_12","alias_value":"H33RYFO7DIXB","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_16","alias_value":"H33RYFO7DIXBS52J","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_8","alias_value":"H33RYFO7","created_at":"2026-07-05T01:59:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:H33RYFO7DIXBS52JC2WCTJYGZL","target":"record","payload":{"canonical_record":{"source":{"id":"2012.08097","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2020-12-15T05:21:50Z","cross_cats_sorted":[],"title_canon_sha256":"6b459f2c215951277634de0ae53d9e277e850726080700177147a961af93457f","abstract_canon_sha256":"19686f5dc3176bf0ea8bb4f7331c9b757c5c26be11fa903694964b33a53b80e5"},"schema_version":"1.0"},"canonical_sha256":"3ef71c15df1a2e19774916ac29a706caed7cfa0222d74df8b4fa75e7e9b760aa","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:59:39.988287Z","signature_b64":"GNPFWzOzWML+ShMxvMpnpdXVG+tO5MFMhuzY6QuaEdytnexdIsZ14/iedyyw5tODXfJ5E2Qp/NoThLkONsc/CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3ef71c15df1a2e19774916ac29a706caed7cfa0222d74df8b4fa75e7e9b760aa","last_reissued_at":"2026-07-05T01:59:39.987911Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:59:39.987911Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2012.08097","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":"2026-07-05T01:59:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"09EY8c8uC5KhKVfJKxUX9LBVkq4Y4WdvkIKMJLQU9ThQL3LxwUMjsETRq7J8hvIQWzh34khSDvfP38hAlgSzCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T04:27:52.999510Z"},"content_sha256":"f106fccfa396044a6b0f9cb9d7e2e3e085ec542d11d2d363e3c61f069f7d5407","schema_version":"1.0","event_id":"sha256:f106fccfa396044a6b0f9cb9d7e2e3e085ec542d11d2d363e3c61f069f7d5407"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:H33RYFO7DIXBS52JC2WCTJYGZL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Towards Improving Spatiotemporal Action Recognition in Videos","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Jingfei Xia, Pinxu Ren, Shentong Mo, Xiaoqing Tan","submitted_at":"2020-12-15T05:21:50Z","abstract_excerpt":"Spatiotemporal action recognition deals with locating and classifying actions in videos. Motivated by the latest state-of-the-art real-time object detector You Only Watch Once (YOWO), we aim to modify its structure to increase action detection precision and reduce computational time. Specifically, we propose four novel approaches in attempts to improve YOWO and address the imbalanced class issue in videos by modifying the loss function. We consider two moderate-sized datasets to apply our modification of YOWO - the popular Joint-annotated Human Motion Data Base (J-HMDB-21) and a private datase"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.08097","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2012.08097/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":"2026-07-05T01:59:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WtoXa1N0xRV3jvW711u6IHHItu4vuSsFV5h5IQsK/PCX9w4u59hCSLCNmNGwuq+vKtwCmViFgh3ZIWLK85hWCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T04:27:52.999893Z"},"content_sha256":"28581a8faf413e635edf4de91204a4fd9236d04a6d1c584cf8e396091ab80229","schema_version":"1.0","event_id":"sha256:28581a8faf413e635edf4de91204a4fd9236d04a6d1c584cf8e396091ab80229"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/H33RYFO7DIXBS52JC2WCTJYGZL/bundle.json","state_url":"https://pith.science/pith/H33RYFO7DIXBS52JC2WCTJYGZL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/H33RYFO7DIXBS52JC2WCTJYGZL/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":"2026-07-07T04:27:53Z","links":{"resolver":"https://pith.science/pith/H33RYFO7DIXBS52JC2WCTJYGZL","bundle":"https://pith.science/pith/H33RYFO7DIXBS52JC2WCTJYGZL/bundle.json","state":"https://pith.science/pith/H33RYFO7DIXBS52JC2WCTJYGZL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/H33RYFO7DIXBS52JC2WCTJYGZL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:H33RYFO7DIXBS52JC2WCTJYGZL","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":"19686f5dc3176bf0ea8bb4f7331c9b757c5c26be11fa903694964b33a53b80e5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2020-12-15T05:21:50Z","title_canon_sha256":"6b459f2c215951277634de0ae53d9e277e850726080700177147a961af93457f"},"schema_version":"1.0","source":{"id":"2012.08097","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.08097","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"arxiv_version","alias_value":"2012.08097v1","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.08097","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_12","alias_value":"H33RYFO7DIXB","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_16","alias_value":"H33RYFO7DIXBS52J","created_at":"2026-07-05T01:59:39Z"},{"alias_kind":"pith_short_8","alias_value":"H33RYFO7","created_at":"2026-07-05T01:59:39Z"}],"graph_snapshots":[{"event_id":"sha256:28581a8faf413e635edf4de91204a4fd9236d04a6d1c584cf8e396091ab80229","target":"graph","created_at":"2026-07-05T01:59:39Z","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/2012.08097/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Spatiotemporal action recognition deals with locating and classifying actions in videos. Motivated by the latest state-of-the-art real-time object detector You Only Watch Once (YOWO), we aim to modify its structure to increase action detection precision and reduce computational time. Specifically, we propose four novel approaches in attempts to improve YOWO and address the imbalanced class issue in videos by modifying the loss function. We consider two moderate-sized datasets to apply our modification of YOWO - the popular Joint-annotated Human Motion Data Base (J-HMDB-21) and a private datase","authors_text":"Jingfei Xia, Pinxu Ren, Shentong Mo, Xiaoqing Tan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2020-12-15T05:21:50Z","title":"Towards Improving Spatiotemporal Action Recognition in Videos"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.08097","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:f106fccfa396044a6b0f9cb9d7e2e3e085ec542d11d2d363e3c61f069f7d5407","target":"record","created_at":"2026-07-05T01:59:39Z","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":"19686f5dc3176bf0ea8bb4f7331c9b757c5c26be11fa903694964b33a53b80e5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2020-12-15T05:21:50Z","title_canon_sha256":"6b459f2c215951277634de0ae53d9e277e850726080700177147a961af93457f"},"schema_version":"1.0","source":{"id":"2012.08097","kind":"arxiv","version":1}},"canonical_sha256":"3ef71c15df1a2e19774916ac29a706caed7cfa0222d74df8b4fa75e7e9b760aa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3ef71c15df1a2e19774916ac29a706caed7cfa0222d74df8b4fa75e7e9b760aa","first_computed_at":"2026-07-05T01:59:39.987911Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:59:39.987911Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GNPFWzOzWML+ShMxvMpnpdXVG+tO5MFMhuzY6QuaEdytnexdIsZ14/iedyyw5tODXfJ5E2Qp/NoThLkONsc/CQ==","signature_status":"signed_v1","signed_at":"2026-07-05T01:59:39.988287Z","signed_message":"canonical_sha256_bytes"},"source_id":"2012.08097","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f106fccfa396044a6b0f9cb9d7e2e3e085ec542d11d2d363e3c61f069f7d5407","sha256:28581a8faf413e635edf4de91204a4fd9236d04a6d1c584cf8e396091ab80229"],"state_sha256":"38d9994abc6c9c09d4026a4542cd737188f71d7d319e0b76d16d4facb3cd31f4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UwOCr/3TDinClNVUaRsc5dEqCjm5TskK5llSHATajUfi/Y9OX6LUpKQRSl/2/xyaO2EWnWYCjrIj3AjXOO8MCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T04:27:53.002866Z","bundle_sha256":"3cb5a5ca45531bf1192f529b2728a1465973f2bdd96112323fad6390c5db7899"}}