{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:CWTGVF44JYUW4N6ZFZJO3KSJVE","short_pith_number":"pith:CWTGVF44","canonical_record":{"source":{"id":"2011.08070","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AR","submitted_at":"2020-11-16T16:20:54Z","cross_cats_sorted":[],"title_canon_sha256":"b3799f1b39eb60959ef915c62aa39527b48ac0a311b3bd749ec32682bd27b72f","abstract_canon_sha256":"3a942e007b761c2720ae61391f062bf4f884f357afff317e986876cdcf0ff47f"},"schema_version":"1.0"},"canonical_sha256":"15a66a979c4e296e37d92e52edaa49a91b038bac2ed46d078d5f7a906bbf2feb","source":{"kind":"arxiv","id":"2011.08070","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2011.08070","created_at":"2026-07-05T01:59:15Z"},{"alias_kind":"arxiv_version","alias_value":"2011.08070v2","created_at":"2026-07-05T01:59:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2011.08070","created_at":"2026-07-05T01:59:15Z"},{"alias_kind":"pith_short_12","alias_value":"CWTGVF44JYUW","created_at":"2026-07-05T01:59:15Z"},{"alias_kind":"pith_short_16","alias_value":"CWTGVF44JYUW4N6Z","created_at":"2026-07-05T01:59:15Z"},{"alias_kind":"pith_short_8","alias_value":"CWTGVF44","created_at":"2026-07-05T01:59:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:CWTGVF44JYUW4N6ZFZJO3KSJVE","target":"record","payload":{"canonical_record":{"source":{"id":"2011.08070","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AR","submitted_at":"2020-11-16T16:20:54Z","cross_cats_sorted":[],"title_canon_sha256":"b3799f1b39eb60959ef915c62aa39527b48ac0a311b3bd749ec32682bd27b72f","abstract_canon_sha256":"3a942e007b761c2720ae61391f062bf4f884f357afff317e986876cdcf0ff47f"},"schema_version":"1.0"},"canonical_sha256":"15a66a979c4e296e37d92e52edaa49a91b038bac2ed46d078d5f7a906bbf2feb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:59:15.335866Z","signature_b64":"ml7Rui6W0HRUwIAR6a/cuqSjy14itPuIF+/1ulc7B84f7j9Sz3g8rnel6Jkk7tCLJ0f8ooQf7G6TrdBcFlPLAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"15a66a979c4e296e37d92e52edaa49a91b038bac2ed46d078d5f7a906bbf2feb","last_reissued_at":"2026-07-05T01:59:15.335352Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:59:15.335352Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2011.08070","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":"2026-07-05T01:59:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"f2fnHXnKRqTa3ZSLjrzhdWR0jHBihswia75GlEBaj1zAC/uNdtxax3oCXWUbJ8Ux91P89dg/WWCA3Tp0QNP/CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T03:19:10.220322Z"},"content_sha256":"be3ee149333a909b3335b934a624e4f62eba9bed9c399bb09b37b61511697ce3","schema_version":"1.0","event_id":"sha256:be3ee149333a909b3335b934a624e4f62eba9bed9c399bb09b37b61511697ce3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:CWTGVF44JYUW4N6ZFZJO3KSJVE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Indirection Stream Semantic Register Architecture for Efficient Sparse-Dense Linear Algebra","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.AR","authors_text":"Fabian Schuiki, Florian Zaruba, Luca Benini, Paul Scheffler, Torsten Hoefler","submitted_at":"2020-11-16T16:20:54Z","abstract_excerpt":"Sparse-dense linear algebra is crucial in many domains, but challenging to handle efficiently on CPUs, GPUs, and accelerators alike; multiplications with sparse formats like CSR and CSF require indirect memory lookups. In this work, we enhance a memory-streaming RISC-V ISA extension to accelerate sparse-dense products through streaming indirection. We present efficient dot, matrix-vector, and matrix-matrix product kernels using our hardware, enabling single-core FPU utilizations of up to 80% and speedups of up to 7.2x over an optimized baseline without extensions. A matrix-vector implementatio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2011.08070","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/2011.08070/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":"2026-07-05T01:59:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vxogfrE2Dy9mBSlN/W6Uaa3/5f0FN5shzZmLddWqcS2ZtM3QSWuOqFPMeh20fRb8rMD27WN6zxi6X/TWxTu1DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T03:19:10.220850Z"},"content_sha256":"d4dcbcf875dbe10ebe8b259e389dd6b3a1e201cd0da95d5f5889df7db785a250","schema_version":"1.0","event_id":"sha256:d4dcbcf875dbe10ebe8b259e389dd6b3a1e201cd0da95d5f5889df7db785a250"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CWTGVF44JYUW4N6ZFZJO3KSJVE/bundle.json","state_url":"https://pith.science/pith/CWTGVF44JYUW4N6ZFZJO3KSJVE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CWTGVF44JYUW4N6ZFZJO3KSJVE/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":"2026-08-23T03:19:10Z","links":{"resolver":"https://pith.science/pith/CWTGVF44JYUW4N6ZFZJO3KSJVE","bundle":"https://pith.science/pith/CWTGVF44JYUW4N6ZFZJO3KSJVE/bundle.json","state":"https://pith.science/pith/CWTGVF44JYUW4N6ZFZJO3KSJVE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CWTGVF44JYUW4N6ZFZJO3KSJVE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:CWTGVF44JYUW4N6ZFZJO3KSJVE","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":"3a942e007b761c2720ae61391f062bf4f884f357afff317e986876cdcf0ff47f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AR","submitted_at":"2020-11-16T16:20:54Z","title_canon_sha256":"b3799f1b39eb60959ef915c62aa39527b48ac0a311b3bd749ec32682bd27b72f"},"schema_version":"1.0","source":{"id":"2011.08070","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2011.08070","created_at":"2026-07-05T01:59:15Z"},{"alias_kind":"arxiv_version","alias_value":"2011.08070v2","created_at":"2026-07-05T01:59:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2011.08070","created_at":"2026-07-05T01:59:15Z"},{"alias_kind":"pith_short_12","alias_value":"CWTGVF44JYUW","created_at":"2026-07-05T01:59:15Z"},{"alias_kind":"pith_short_16","alias_value":"CWTGVF44JYUW4N6Z","created_at":"2026-07-05T01:59:15Z"},{"alias_kind":"pith_short_8","alias_value":"CWTGVF44","created_at":"2026-07-05T01:59:15Z"}],"graph_snapshots":[{"event_id":"sha256:d4dcbcf875dbe10ebe8b259e389dd6b3a1e201cd0da95d5f5889df7db785a250","target":"graph","created_at":"2026-07-05T01:59:15Z","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/2011.08070/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Sparse-dense linear algebra is crucial in many domains, but challenging to handle efficiently on CPUs, GPUs, and accelerators alike; multiplications with sparse formats like CSR and CSF require indirect memory lookups. In this work, we enhance a memory-streaming RISC-V ISA extension to accelerate sparse-dense products through streaming indirection. We present efficient dot, matrix-vector, and matrix-matrix product kernels using our hardware, enabling single-core FPU utilizations of up to 80% and speedups of up to 7.2x over an optimized baseline without extensions. A matrix-vector implementatio","authors_text":"Fabian Schuiki, Florian Zaruba, Luca Benini, Paul Scheffler, Torsten Hoefler","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AR","submitted_at":"2020-11-16T16:20:54Z","title":"Indirection Stream Semantic Register Architecture for Efficient Sparse-Dense Linear Algebra"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2011.08070","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:be3ee149333a909b3335b934a624e4f62eba9bed9c399bb09b37b61511697ce3","target":"record","created_at":"2026-07-05T01:59:15Z","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":"3a942e007b761c2720ae61391f062bf4f884f357afff317e986876cdcf0ff47f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.AR","submitted_at":"2020-11-16T16:20:54Z","title_canon_sha256":"b3799f1b39eb60959ef915c62aa39527b48ac0a311b3bd749ec32682bd27b72f"},"schema_version":"1.0","source":{"id":"2011.08070","kind":"arxiv","version":2}},"canonical_sha256":"15a66a979c4e296e37d92e52edaa49a91b038bac2ed46d078d5f7a906bbf2feb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"15a66a979c4e296e37d92e52edaa49a91b038bac2ed46d078d5f7a906bbf2feb","first_computed_at":"2026-07-05T01:59:15.335352Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:59:15.335352Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ml7Rui6W0HRUwIAR6a/cuqSjy14itPuIF+/1ulc7B84f7j9Sz3g8rnel6Jkk7tCLJ0f8ooQf7G6TrdBcFlPLAA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:59:15.335866Z","signed_message":"canonical_sha256_bytes"},"source_id":"2011.08070","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:be3ee149333a909b3335b934a624e4f62eba9bed9c399bb09b37b61511697ce3","sha256:d4dcbcf875dbe10ebe8b259e389dd6b3a1e201cd0da95d5f5889df7db785a250"],"state_sha256":"815d173b39075652803fbf4043294490c1c800b5d986a6d9ca9cbd983a7ac97f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bgXhsaGpYwhbELE+ROpYDnIXEAreNwHKpDPNRIfIA7DHmd9TEGwD9Tlprm84L6HjgeVBdLUJTQZ3h1vDCmt8Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T03:19:10.226363Z","bundle_sha256":"c0542fa0fe29fd3a661be2220e457d76e91935ca8865c9a1091b33756775d2d1"}}