{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:IATIAHY3ZT7WSTRCQ37ZT3HPAS","short_pith_number":"pith:IATIAHY3","canonical_record":{"source":{"id":"2607.01817","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2026-07-02T07:30:53Z","cross_cats_sorted":[],"title_canon_sha256":"c91ccc92007e88ff56cd1417279eb4e650454051992342bfb4afb1e35aac84d7","abstract_canon_sha256":"ec83defdb061cacf7dabbd732ece7bdb9da571100577f11590d845ea625f95dd"},"schema_version":"1.0"},"canonical_sha256":"4026801f1bccff694e2286ff99ecef0484328c9fe2152df6fc711865a781fd68","source":{"kind":"arxiv","id":"2607.01817","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.01817","created_at":"2026-07-03T01:17:30Z"},{"alias_kind":"arxiv_version","alias_value":"2607.01817v1","created_at":"2026-07-03T01:17:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.01817","created_at":"2026-07-03T01:17:30Z"},{"alias_kind":"pith_short_12","alias_value":"IATIAHY3ZT7W","created_at":"2026-07-03T01:17:30Z"},{"alias_kind":"pith_short_16","alias_value":"IATIAHY3ZT7WSTRC","created_at":"2026-07-03T01:17:30Z"},{"alias_kind":"pith_short_8","alias_value":"IATIAHY3","created_at":"2026-07-03T01:17:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:IATIAHY3ZT7WSTRCQ37ZT3HPAS","target":"record","payload":{"canonical_record":{"source":{"id":"2607.01817","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2026-07-02T07:30:53Z","cross_cats_sorted":[],"title_canon_sha256":"c91ccc92007e88ff56cd1417279eb4e650454051992342bfb4afb1e35aac84d7","abstract_canon_sha256":"ec83defdb061cacf7dabbd732ece7bdb9da571100577f11590d845ea625f95dd"},"schema_version":"1.0"},"canonical_sha256":"4026801f1bccff694e2286ff99ecef0484328c9fe2152df6fc711865a781fd68","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-03T01:17:30.741275Z","signature_b64":"fBaZNE+fO00+BeqrEZ46pSQxnOD9ECK0/+Zmaj4mAD4hcdM5ikRbpezd9wdfYdUkU6bYwjbGzHFm1BXdwLojCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4026801f1bccff694e2286ff99ecef0484328c9fe2152df6fc711865a781fd68","last_reissued_at":"2026-07-03T01:17:30.740867Z","signature_status":"signed_v1","first_computed_at":"2026-07-03T01:17:30.740867Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.01817","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":"2026-07-03T01:17:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H6oCcjDfp4kOYaVj4vHexld5zcTSCXLhm06iebrjyura1MMbucU9BeeX0vdhLcDETFSz5exlIWQ7vyKH2n4aAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-03T10:00:05.689718Z"},"content_sha256":"8ce201653e5235a6032614baf64978d6e888b0402b9b880974167759d5602f00","schema_version":"1.0","event_id":"sha256:8ce201653e5235a6032614baf64978d6e888b0402b9b880974167759d5602f00"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:IATIAHY3ZT7WSTRCQ37ZT3HPAS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"HCMS: Head-Chunked Multi-Stream Pipeline for Communication-Computation Overlap in Long-Sequence Parallel Attention","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.DC","authors_text":"Chao Yuan, Jing Liu, Pan Li, Yingnan Sun","submitted_at":"2026-07-02T07:30:53Z","abstract_excerpt":"All-to-all based sequence parallelism methods execute communication and computation strictly in serial when processing medium-long sequences, resulting in hardware resource underutilization. This paper proposes Head-Chunked Multi-Stream Pipeline (HCMS), which exploits the computational independence of multi-head attention by partitioning attention heads into multiple chunks and achieving fine-grained communication-computation overlap through dual CUDA streams. HCMS is orthogonally compatible with existing optimizations such as FlashAttention and SDPA, requires no modification to underlying ker"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.01817","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/2607.01817/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":"2026-07-03T01:17:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lbu41eSqnch7P3fxt2WbCGEGSdjP4a+jKAlTcJTQOLRZuCHrQ1ATEmSH7QhFu9E8HSHLJmzUsq7RksrEZfSHAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-03T10:00:05.690089Z"},"content_sha256":"558551ee4602cd2c9e745269c0a88475d5681cf7134bf8c36d600737834b8b4e","schema_version":"1.0","event_id":"sha256:558551ee4602cd2c9e745269c0a88475d5681cf7134bf8c36d600737834b8b4e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IATIAHY3ZT7WSTRCQ37ZT3HPAS/bundle.json","state_url":"https://pith.science/pith/IATIAHY3ZT7WSTRCQ37ZT3HPAS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IATIAHY3ZT7WSTRCQ37ZT3HPAS/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":"2026-07-03T10:00:05Z","links":{"resolver":"https://pith.science/pith/IATIAHY3ZT7WSTRCQ37ZT3HPAS","bundle":"https://pith.science/pith/IATIAHY3ZT7WSTRCQ37ZT3HPAS/bundle.json","state":"https://pith.science/pith/IATIAHY3ZT7WSTRCQ37ZT3HPAS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IATIAHY3ZT7WSTRCQ37ZT3HPAS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:IATIAHY3ZT7WSTRCQ37ZT3HPAS","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":"ec83defdb061cacf7dabbd732ece7bdb9da571100577f11590d845ea625f95dd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2026-07-02T07:30:53Z","title_canon_sha256":"c91ccc92007e88ff56cd1417279eb4e650454051992342bfb4afb1e35aac84d7"},"schema_version":"1.0","source":{"id":"2607.01817","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.01817","created_at":"2026-07-03T01:17:30Z"},{"alias_kind":"arxiv_version","alias_value":"2607.01817v1","created_at":"2026-07-03T01:17:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.01817","created_at":"2026-07-03T01:17:30Z"},{"alias_kind":"pith_short_12","alias_value":"IATIAHY3ZT7W","created_at":"2026-07-03T01:17:30Z"},{"alias_kind":"pith_short_16","alias_value":"IATIAHY3ZT7WSTRC","created_at":"2026-07-03T01:17:30Z"},{"alias_kind":"pith_short_8","alias_value":"IATIAHY3","created_at":"2026-07-03T01:17:30Z"}],"graph_snapshots":[{"event_id":"sha256:558551ee4602cd2c9e745269c0a88475d5681cf7134bf8c36d600737834b8b4e","target":"graph","created_at":"2026-07-03T01:17:30Z","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/2607.01817/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"All-to-all based sequence parallelism methods execute communication and computation strictly in serial when processing medium-long sequences, resulting in hardware resource underutilization. This paper proposes Head-Chunked Multi-Stream Pipeline (HCMS), which exploits the computational independence of multi-head attention by partitioning attention heads into multiple chunks and achieving fine-grained communication-computation overlap through dual CUDA streams. HCMS is orthogonally compatible with existing optimizations such as FlashAttention and SDPA, requires no modification to underlying ker","authors_text":"Chao Yuan, Jing Liu, Pan Li, Yingnan Sun","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2026-07-02T07:30:53Z","title":"HCMS: Head-Chunked Multi-Stream Pipeline for Communication-Computation Overlap in Long-Sequence Parallel Attention"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.01817","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":"sha256:8ce201653e5235a6032614baf64978d6e888b0402b9b880974167759d5602f00","target":"record","created_at":"2026-07-03T01:17:30Z","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":"ec83defdb061cacf7dabbd732ece7bdb9da571100577f11590d845ea625f95dd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2026-07-02T07:30:53Z","title_canon_sha256":"c91ccc92007e88ff56cd1417279eb4e650454051992342bfb4afb1e35aac84d7"},"schema_version":"1.0","source":{"id":"2607.01817","kind":"arxiv","version":1}},"canonical_sha256":"4026801f1bccff694e2286ff99ecef0484328c9fe2152df6fc711865a781fd68","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4026801f1bccff694e2286ff99ecef0484328c9fe2152df6fc711865a781fd68","first_computed_at":"2026-07-03T01:17:30.740867Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-03T01:17:30.740867Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fBaZNE+fO00+BeqrEZ46pSQxnOD9ECK0/+Zmaj4mAD4hcdM5ikRbpezd9wdfYdUkU6bYwjbGzHFm1BXdwLojCw==","signature_status":"signed_v1","signed_at":"2026-07-03T01:17:30.741275Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.01817","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8ce201653e5235a6032614baf64978d6e888b0402b9b880974167759d5602f00","sha256:558551ee4602cd2c9e745269c0a88475d5681cf7134bf8c36d600737834b8b4e"],"state_sha256":"89e64b475cf1675b9a7c46f385691879b680fd469b963493b67c5381fc0292cf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qrzAh9XBEG+j8Z3WDiP4D4EeQ4lSK244CIXoYGD8cKK+LvOvkwIMKMPQ8bRORuXOkVKnZlomNrWp4tUYENm/AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-03T10:00:05.692186Z","bundle_sha256":"a416f3f06e4d6e67ce73f57f209c88513ab7413651e123bf980443d7ccac73d3"}}