{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:MZTARQSUJPBLSD256AT5GA6JLS","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":"bbea4ffde791eee594fcc2148979b7574ca335ceb58d99700dbc1d8e163df910","cross_cats_sorted":["cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2025-03-24T17:06:37Z","title_canon_sha256":"fb828e6b83211df9c16f52a252a2e3ef944b75a5734843472fd11f3b751a3ccb"},"schema_version":"1.0","source":{"id":"2503.18893","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2503.18893","created_at":"2026-05-28T01:04:27Z"},{"alias_kind":"arxiv_version","alias_value":"2503.18893v2","created_at":"2026-05-28T01:04:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2503.18893","created_at":"2026-05-28T01:04:27Z"},{"alias_kind":"pith_short_12","alias_value":"MZTARQSUJPBL","created_at":"2026-05-28T01:04:27Z"},{"alias_kind":"pith_short_16","alias_value":"MZTARQSUJPBLSD25","created_at":"2026-05-28T01:04:27Z"},{"alias_kind":"pith_short_8","alias_value":"MZTARQSU","created_at":"2026-05-28T01:04:27Z"}],"graph_snapshots":[{"event_id":"sha256:d9674b2cc22be3090c4b41ed71e1fbced54ab5c99bca78ebc934959ed732596c","target":"graph","created_at":"2026-05-28T01:04:27Z","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/2503.18893/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Long-context Large Language Models (LLMs) enable powerful applications but incur high memory costs due to the key-value states (KV-Cache). Recent studies attempt to share KV-Cache across layers, but these approaches either require expensive pretraining or rely on per-token cross-layer cosine similarity that is often limited in practice. We show, via Centered Kernel Alignment (CKA), that the dominant singular vectors of KV-Cache are well aligned across layers. Motivated by this observation, we propose xKV, a post-training compression method that jointly factorizes grouped-layer KV-Cache into a ","authors_text":"Chi-Chih Chang, Chien-Yu Lin, Huiqiang Jiang, Hung-Yueh Chiang, Kai-Chiang Wu, Luis Ceze, Mohamed S. Abdelfattah, Wei-Cheng Lin, Xilai Dai, Yash Akhauri, Yucheng Li","cross_cats":["cs.LG"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2025-03-24T17:06:37Z","title":"xKV: Cross-Layer KV-Cache Compression via Aligned Singular Vector Extraction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2503.18893","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:e763ded5fa6716925eecdd265aeaf29455e83c7c62020ea270b3970746ac2596","target":"record","created_at":"2026-05-28T01:04:27Z","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":"bbea4ffde791eee594fcc2148979b7574ca335ceb58d99700dbc1d8e163df910","cross_cats_sorted":["cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2025-03-24T17:06:37Z","title_canon_sha256":"fb828e6b83211df9c16f52a252a2e3ef944b75a5734843472fd11f3b751a3ccb"},"schema_version":"1.0","source":{"id":"2503.18893","kind":"arxiv","version":2}},"canonical_sha256":"666608c2544bc2b90f5df027d303c95cbfe469ef7374a3f5cc792a26955f75e1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"666608c2544bc2b90f5df027d303c95cbfe469ef7374a3f5cc792a26955f75e1","first_computed_at":"2026-05-28T01:04:27.440187Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-28T01:04:27.440187Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"O6D4Kf8YJNTifyV9NUVJV8xNAflf5WgPPJHKeX9z0I2pJi4xkCHgynWRDBXhJxNXANejs8kg+aOVVUH6aHXEDA==","signature_status":"signed_v1","signed_at":"2026-05-28T01:04:27.440866Z","signed_message":"canonical_sha256_bytes"},"source_id":"2503.18893","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e763ded5fa6716925eecdd265aeaf29455e83c7c62020ea270b3970746ac2596","sha256:d9674b2cc22be3090c4b41ed71e1fbced54ab5c99bca78ebc934959ed732596c"],"state_sha256":"07eef8256091fd729a21ccbfa13051a53dbe21b26c02882d08d6cca3b0b4e403"}