{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:UZH6IRRTN35SHELFE2XGIJCNY2","short_pith_number":"pith:UZH6IRRT","canonical_record":{"source":{"id":"1901.07518","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-01-22T18:50:36Z","cross_cats_sorted":[],"title_canon_sha256":"5a5c5bc9571b9efaab487af88f39987affe31be5e56487b89cfbc3162fceea56","abstract_canon_sha256":"0650f54235deab24be55a67ceaed69879107cf3864de574ec1d1b4786f518e18"},"schema_version":"1.0"},"canonical_sha256":"a64fe446336efb23916526ae64244dc69bb137a64b44501fd9b9da4a81ca5e19","source":{"kind":"arxiv","id":"1901.07518","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.07518","created_at":"2026-05-17T23:49:02Z"},{"alias_kind":"arxiv_version","alias_value":"1901.07518v2","created_at":"2026-05-17T23:49:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.07518","created_at":"2026-05-17T23:49:02Z"},{"alias_kind":"pith_short_12","alias_value":"UZH6IRRTN35S","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"UZH6IRRTN35SHELF","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"UZH6IRRT","created_at":"2026-05-18T12:33:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:UZH6IRRTN35SHELFE2XGIJCNY2","target":"record","payload":{"canonical_record":{"source":{"id":"1901.07518","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-01-22T18:50:36Z","cross_cats_sorted":[],"title_canon_sha256":"5a5c5bc9571b9efaab487af88f39987affe31be5e56487b89cfbc3162fceea56","abstract_canon_sha256":"0650f54235deab24be55a67ceaed69879107cf3864de574ec1d1b4786f518e18"},"schema_version":"1.0"},"canonical_sha256":"a64fe446336efb23916526ae64244dc69bb137a64b44501fd9b9da4a81ca5e19","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:49:02.194033Z","signature_b64":"TyVKMAMxRZoJ339QX/iJBCfxGcP81UuGKu9aG4s4kCHChOIHmP6soP9oh9X3xYE0/ySc84fPeodnxHI7yK6UBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a64fe446336efb23916526ae64244dc69bb137a64b44501fd9b9da4a81ca5e19","last_reissued_at":"2026-05-17T23:49:02.193523Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:49:02.193523Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.07518","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":"2026-05-17T23:49:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RHu5RFgWEKGU1rxCjwp/t+CFCc1XxaX7zkeTHwl1RnQ6LqIJNBkkV0h5WvMjR612RCry4aVURmdRHESw2Ut3Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T23:50:44.541401Z"},"content_sha256":"8e55ee1376316b3ea217662979dc93b02825ef6b9aef2c24658ed95a81b0e5c9","schema_version":"1.0","event_id":"sha256:8e55ee1376316b3ea217662979dc93b02825ef6b9aef2c24658ed95a81b0e5c9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:UZH6IRRTN35SHELFE2XGIJCNY2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hybrid Task Cascade for Instance Segmentation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Chen Change Loy, Dahua Lin, Jiangmiao Pang, Jianping Shi, Jiaqi Wang, Kai Chen, Shuyang Sun, Wanli Ouyang, Wansen Feng, Xiaoxiao Li, Yu Xiong, Ziwei Liu","submitted_at":"2019-01-22T18:50:36Z","abstract_excerpt":"Cascade is a classic yet powerful architecture that has boosted performance on various tasks. However, how to introduce cascade to instance segmentation remains an open question. A simple combination of Cascade R-CNN and Mask R-CNN only brings limited gain. In exploring a more effective approach, we find that the key to a successful instance segmentation cascade is to fully leverage the reciprocal relationship between detection and segmentation. In this work, we propose a new framework, Hybrid Task Cascade (HTC), which differs in two important aspects: (1) instead of performing cascaded refine"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.07518","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":""},"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":"2026-05-17T23:49:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Dlsub3Ru4QTPUH99hyyMWk+pkGAfqFTTRbs5f8QSz+6ZKz6l6UI7zfuFnKHHVGNJ9FYHwAs7mZSy2uxdZJXJDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T23:50:44.542070Z"},"content_sha256":"1605c7eba80ece58dcb5a2bf829279189044334468b7d7f7e14fec9022185020","schema_version":"1.0","event_id":"sha256:1605c7eba80ece58dcb5a2bf829279189044334468b7d7f7e14fec9022185020"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UZH6IRRTN35SHELFE2XGIJCNY2/bundle.json","state_url":"https://pith.science/pith/UZH6IRRTN35SHELFE2XGIJCNY2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UZH6IRRTN35SHELFE2XGIJCNY2/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":"2026-05-18T23:50:44Z","links":{"resolver":"https://pith.science/pith/UZH6IRRTN35SHELFE2XGIJCNY2","bundle":"https://pith.science/pith/UZH6IRRTN35SHELFE2XGIJCNY2/bundle.json","state":"https://pith.science/pith/UZH6IRRTN35SHELFE2XGIJCNY2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UZH6IRRTN35SHELFE2XGIJCNY2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:UZH6IRRTN35SHELFE2XGIJCNY2","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":"0650f54235deab24be55a67ceaed69879107cf3864de574ec1d1b4786f518e18","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-01-22T18:50:36Z","title_canon_sha256":"5a5c5bc9571b9efaab487af88f39987affe31be5e56487b89cfbc3162fceea56"},"schema_version":"1.0","source":{"id":"1901.07518","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.07518","created_at":"2026-05-17T23:49:02Z"},{"alias_kind":"arxiv_version","alias_value":"1901.07518v2","created_at":"2026-05-17T23:49:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.07518","created_at":"2026-05-17T23:49:02Z"},{"alias_kind":"pith_short_12","alias_value":"UZH6IRRTN35S","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"UZH6IRRTN35SHELF","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"UZH6IRRT","created_at":"2026-05-18T12:33:30Z"}],"graph_snapshots":[{"event_id":"sha256:1605c7eba80ece58dcb5a2bf829279189044334468b7d7f7e14fec9022185020","target":"graph","created_at":"2026-05-17T23:49:02Z","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":"Cascade is a classic yet powerful architecture that has boosted performance on various tasks. However, how to introduce cascade to instance segmentation remains an open question. A simple combination of Cascade R-CNN and Mask R-CNN only brings limited gain. In exploring a more effective approach, we find that the key to a successful instance segmentation cascade is to fully leverage the reciprocal relationship between detection and segmentation. In this work, we propose a new framework, Hybrid Task Cascade (HTC), which differs in two important aspects: (1) instead of performing cascaded refine","authors_text":"Chen Change Loy, Dahua Lin, Jiangmiao Pang, Jianping Shi, Jiaqi Wang, Kai Chen, Shuyang Sun, Wanli Ouyang, Wansen Feng, Xiaoxiao Li, Yu Xiong, Ziwei Liu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-01-22T18:50:36Z","title":"Hybrid Task Cascade for Instance Segmentation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.07518","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":"sha256:8e55ee1376316b3ea217662979dc93b02825ef6b9aef2c24658ed95a81b0e5c9","target":"record","created_at":"2026-05-17T23:49:02Z","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":"0650f54235deab24be55a67ceaed69879107cf3864de574ec1d1b4786f518e18","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-01-22T18:50:36Z","title_canon_sha256":"5a5c5bc9571b9efaab487af88f39987affe31be5e56487b89cfbc3162fceea56"},"schema_version":"1.0","source":{"id":"1901.07518","kind":"arxiv","version":2}},"canonical_sha256":"a64fe446336efb23916526ae64244dc69bb137a64b44501fd9b9da4a81ca5e19","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a64fe446336efb23916526ae64244dc69bb137a64b44501fd9b9da4a81ca5e19","first_computed_at":"2026-05-17T23:49:02.193523Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:02.193523Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TyVKMAMxRZoJ339QX/iJBCfxGcP81UuGKu9aG4s4kCHChOIHmP6soP9oh9X3xYE0/ySc84fPeodnxHI7yK6UBQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:02.194033Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.07518","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e55ee1376316b3ea217662979dc93b02825ef6b9aef2c24658ed95a81b0e5c9","sha256:1605c7eba80ece58dcb5a2bf829279189044334468b7d7f7e14fec9022185020"],"state_sha256":"1d181bbe0cf565b5c752079d00a64a9ab02a75bc810065cc8bcdfce67e032c43"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UQLINurzSWXlTx3GF5ksK7eVCT4i552oUsBxy9JncpPpF1ppu5AwcwpLZZJDa9Pdasa2eS5u/8hD1siAbYvhCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-18T23:50:44.544077Z","bundle_sha256":"f61e8003e12da6224eb4dfedf4fd159ae4cf0592cd9677e2c7399911d19b8ad3"}}