{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:WZ2SUPOHNZ62K7RDDWHYKBSBLT","short_pith_number":"pith:WZ2SUPOH","canonical_record":{"source":{"id":"2603.06274","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2026-03-06T13:33:29Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"caa84f17b6510fab4af3ccada771a5202362f7e67c48eaf3c5b191d6993f9634","abstract_canon_sha256":"6424064e8315bfae309e9d4021e00ff5b9e99598bf07a5d86322e6ee73859f1b"},"schema_version":"1.0"},"canonical_sha256":"b6752a3dc76e7da57e231d8f8506415cca260a92241a53c0b92b6e8ed13f4afa","source":{"kind":"arxiv","id":"2603.06274","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2603.06274","created_at":"2026-08-03T01:14:08Z"},{"alias_kind":"arxiv_version","alias_value":"2603.06274v2","created_at":"2026-08-03T01:14:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2603.06274","created_at":"2026-08-03T01:14:08Z"},{"alias_kind":"pith_short_12","alias_value":"WZ2SUPOHNZ62","created_at":"2026-08-03T01:14:08Z"},{"alias_kind":"pith_short_16","alias_value":"WZ2SUPOHNZ62K7RD","created_at":"2026-08-03T01:14:08Z"},{"alias_kind":"pith_short_8","alias_value":"WZ2SUPOH","created_at":"2026-08-03T01:14:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:WZ2SUPOHNZ62K7RDDWHYKBSBLT","target":"record","payload":{"canonical_record":{"source":{"id":"2603.06274","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2026-03-06T13:33:29Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"caa84f17b6510fab4af3ccada771a5202362f7e67c48eaf3c5b191d6993f9634","abstract_canon_sha256":"6424064e8315bfae309e9d4021e00ff5b9e99598bf07a5d86322e6ee73859f1b"},"schema_version":"1.0"},"canonical_sha256":"b6752a3dc76e7da57e231d8f8506415cca260a92241a53c0b92b6e8ed13f4afa","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-03T01:14:08.582513Z","signature_b64":"IceLIUI9tlylNCYAOF4dl20E2fM79JC8NEeTp8xZ1TFJjG6DTCxvHekLGJiByzUelZg9DzdrCdJtqNrvYf5bBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b6752a3dc76e7da57e231d8f8506415cca260a92241a53c0b92b6e8ed13f4afa","last_reissued_at":"2026-08-03T01:14:08.580898Z","signature_status":"signed_v1","first_computed_at":"2026-08-03T01:14:08.580898Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2603.06274","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":"2026-08-03T01:14:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vWjIQgdJRRCivwhMwmJ1EXSh9Zsr8yBjEXsrBsfai3hrRCG3zEOqiYdsalDu2Thr9QcGCvsq8ICeLUGS1hp8Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T21:16:00.629154Z"},"content_sha256":"7569abcf9968ada5efbdb5dd0516b98b78319e4e4651bfa8d59b31d56587d6fe","schema_version":"1.0","event_id":"sha256:7569abcf9968ada5efbdb5dd0516b98b78319e4e4651bfa8d59b31d56587d6fe"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:WZ2SUPOHNZ62K7RDDWHYKBSBLT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Stem: Rethinking Causal Information Flow in Sparse Attention","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI"],"primary_cat":"cs.LG","authors_text":"Guanghua Yu, Jianchen Zhu, Linchuan Xie, Lin Niu, S Kevin Zhou, Xin Luo, Yifu Sun","submitted_at":"2026-03-06T13:33:29Z","abstract_excerpt":"The quadratic computational complexity of self-attention remains a fundamental bottleneck for scaling Large Language Models (LLMs) to long contexts, particularly during the pre-filling phase. In this paper, we rethink the causal attention mechanism from the perspective of information flow. Due to causal constraints, tokens at initial positions participate in the aggregation of every subsequent token. However, existing sparse methods typically apply a uniform top-k selection across all token positions within a layer, ignoring the cumulative dependency of token information inherent in causal arc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2603.06274","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/2603.06274/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":"2026-08-03T01:14:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"drQT1L/W3Zs2IC7l3+XDgIM58O6hh1tpl3r9aruBGKGcxLSeoP1cCJH/vd+iyxkz0mF9GMDSZnERknF2Ehz5AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T21:16:00.629615Z"},"content_sha256":"fe8749ca0ec2197e44289097535275ace33792a8c2c3e86e377b56b31ac7af42","schema_version":"1.0","event_id":"sha256:fe8749ca0ec2197e44289097535275ace33792a8c2c3e86e377b56b31ac7af42"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WZ2SUPOHNZ62K7RDDWHYKBSBLT/bundle.json","state_url":"https://pith.science/pith/WZ2SUPOHNZ62K7RDDWHYKBSBLT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WZ2SUPOHNZ62K7RDDWHYKBSBLT/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":"2026-08-03T21:16:00Z","links":{"resolver":"https://pith.science/pith/WZ2SUPOHNZ62K7RDDWHYKBSBLT","bundle":"https://pith.science/pith/WZ2SUPOHNZ62K7RDDWHYKBSBLT/bundle.json","state":"https://pith.science/pith/WZ2SUPOHNZ62K7RDDWHYKBSBLT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WZ2SUPOHNZ62K7RDDWHYKBSBLT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:WZ2SUPOHNZ62K7RDDWHYKBSBLT","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":"6424064e8315bfae309e9d4021e00ff5b9e99598bf07a5d86322e6ee73859f1b","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2026-03-06T13:33:29Z","title_canon_sha256":"caa84f17b6510fab4af3ccada771a5202362f7e67c48eaf3c5b191d6993f9634"},"schema_version":"1.0","source":{"id":"2603.06274","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2603.06274","created_at":"2026-08-03T01:14:08Z"},{"alias_kind":"arxiv_version","alias_value":"2603.06274v2","created_at":"2026-08-03T01:14:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2603.06274","created_at":"2026-08-03T01:14:08Z"},{"alias_kind":"pith_short_12","alias_value":"WZ2SUPOHNZ62","created_at":"2026-08-03T01:14:08Z"},{"alias_kind":"pith_short_16","alias_value":"WZ2SUPOHNZ62K7RD","created_at":"2026-08-03T01:14:08Z"},{"alias_kind":"pith_short_8","alias_value":"WZ2SUPOH","created_at":"2026-08-03T01:14:08Z"}],"graph_snapshots":[{"event_id":"sha256:fe8749ca0ec2197e44289097535275ace33792a8c2c3e86e377b56b31ac7af42","target":"graph","created_at":"2026-08-03T01:14:08Z","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/2603.06274/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The quadratic computational complexity of self-attention remains a fundamental bottleneck for scaling Large Language Models (LLMs) to long contexts, particularly during the pre-filling phase. In this paper, we rethink the causal attention mechanism from the perspective of information flow. Due to causal constraints, tokens at initial positions participate in the aggregation of every subsequent token. However, existing sparse methods typically apply a uniform top-k selection across all token positions within a layer, ignoring the cumulative dependency of token information inherent in causal arc","authors_text":"Guanghua Yu, Jianchen Zhu, Linchuan Xie, Lin Niu, S Kevin Zhou, Xin Luo, Yifu Sun","cross_cats":["cs.AI"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2026-03-06T13:33:29Z","title":"Stem: Rethinking Causal Information Flow in Sparse Attention"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2603.06274","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":"sha256:7569abcf9968ada5efbdb5dd0516b98b78319e4e4651bfa8d59b31d56587d6fe","target":"record","created_at":"2026-08-03T01:14:08Z","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":"6424064e8315bfae309e9d4021e00ff5b9e99598bf07a5d86322e6ee73859f1b","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2026-03-06T13:33:29Z","title_canon_sha256":"caa84f17b6510fab4af3ccada771a5202362f7e67c48eaf3c5b191d6993f9634"},"schema_version":"1.0","source":{"id":"2603.06274","kind":"arxiv","version":2}},"canonical_sha256":"b6752a3dc76e7da57e231d8f8506415cca260a92241a53c0b92b6e8ed13f4afa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b6752a3dc76e7da57e231d8f8506415cca260a92241a53c0b92b6e8ed13f4afa","first_computed_at":"2026-08-03T01:14:08.580898Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-03T01:14:08.580898Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IceLIUI9tlylNCYAOF4dl20E2fM79JC8NEeTp8xZ1TFJjG6DTCxvHekLGJiByzUelZg9DzdrCdJtqNrvYf5bBg==","signature_status":"signed_v1","signed_at":"2026-08-03T01:14:08.582513Z","signed_message":"canonical_sha256_bytes"},"source_id":"2603.06274","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7569abcf9968ada5efbdb5dd0516b98b78319e4e4651bfa8d59b31d56587d6fe","sha256:fe8749ca0ec2197e44289097535275ace33792a8c2c3e86e377b56b31ac7af42"],"state_sha256":"60d19f374015ed618c55ef19f7c2f5d7de226a25d71b1628e89b1b41ef6b9022"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RTODuO8JHceapy7K+mJaY7gDXRtY+s0KHDVqTYrpPAv33irq7xe13qZIAejKgQ4jo3oywIpn/+mQ43OKbeE/Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T21:16:00.632319Z","bundle_sha256":"4b127a91e818ea7b577ebe5b80cec4efc589a25584ce32fc0fe31df479d91a76"}}