{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:MBYFMGYRKPVYJPUSLB7RFJBREP","short_pith_number":"pith:MBYFMGYR","canonical_record":{"source":{"id":"2103.09976","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2021-03-18T01:49:19Z","cross_cats_sorted":[],"title_canon_sha256":"cf5bcc02f0064d286c9e4bf19decb9e5d573aed4b3ac7e81614788bd876adc69","abstract_canon_sha256":"908708a7014c6c8d1686a6ee15384e564fe122f376823d387e6bdc3f66a9d2b2"},"schema_version":"1.0"},"canonical_sha256":"6070561b1153eb84be92587f12a43123db51c32c8de67b13f1e5b0db224fde90","source":{"kind":"arxiv","id":"2103.09976","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.09976","created_at":"2026-07-05T02:51:39Z"},{"alias_kind":"arxiv_version","alias_value":"2103.09976v3","created_at":"2026-07-05T02:51:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.09976","created_at":"2026-07-05T02:51:39Z"},{"alias_kind":"pith_short_12","alias_value":"MBYFMGYRKPVY","created_at":"2026-07-05T02:51:39Z"},{"alias_kind":"pith_short_16","alias_value":"MBYFMGYRKPVYJPUS","created_at":"2026-07-05T02:51:39Z"},{"alias_kind":"pith_short_8","alias_value":"MBYFMGYR","created_at":"2026-07-05T02:51:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:MBYFMGYRKPVYJPUSLB7RFJBREP","target":"record","payload":{"canonical_record":{"source":{"id":"2103.09976","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2021-03-18T01:49:19Z","cross_cats_sorted":[],"title_canon_sha256":"cf5bcc02f0064d286c9e4bf19decb9e5d573aed4b3ac7e81614788bd876adc69","abstract_canon_sha256":"908708a7014c6c8d1686a6ee15384e564fe122f376823d387e6bdc3f66a9d2b2"},"schema_version":"1.0"},"canonical_sha256":"6070561b1153eb84be92587f12a43123db51c32c8de67b13f1e5b0db224fde90","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:51:39.657092Z","signature_b64":"Kl7L6+wcTyFmZh0owFFdc69pZpZh5+BSaPQJ3+C6QO7b3yawQ8zogb35xOu7o93WhUb1U9WJEbEt83QHPW2LAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6070561b1153eb84be92587f12a43123db51c32c8de67b13f1e5b0db224fde90","last_reissued_at":"2026-07-05T02:51:39.656667Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:51:39.656667Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2103.09976","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:51:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vvxzfXg3Xkp2kqvFlc2HMn3yMJibbkEr1Qoz4K1tNdQZCAmaIRHUT1W6gJCnZet/Ph9/OSo6186l1bNogPzwDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T01:08:49.219754Z"},"content_sha256":"c02a9763630ba0e1e4cc8b7ccee4a7867e3a5edcbdc2ddbe7e3993506d0b2301","schema_version":"1.0","event_id":"sha256:c02a9763630ba0e1e4cc8b7ccee4a7867e3a5edcbdc2ddbe7e3993506d0b2301"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:MBYFMGYRKPVYJPUSLB7RFJBREP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Low communication high performance ab initio density matrix renormalization group algorithms","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.chem-ph","authors_text":"Garnet Kin-Lic Chan, Huanchen Zhai","submitted_at":"2021-03-18T01:49:19Z","abstract_excerpt":"There has been recent interest in the deployment of ab initio density matrix renormalization group computations on high performance computing platforms. Here, we introduce a reformulation of the conventional distributed memory ab initio DMRG algorithm that connects it to the conceptually simpler and advantageous sum of sub-Hamiltonians approach. Starting from this framework, we further explore a hierarchy of parallelism strategies, that includes (i) parallelism over the sum of sub-Hamiltonians, (ii) parallelism over sites, (iii) parallelism over normal and complementary operators, (iv) paralle"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.09976","kind":"arxiv","version":3},"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/2103.09976/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":"2026-07-05T02:51:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xdv12s47hbmmCZT2rtSMtrrDHO0OSalxCzmr93eBC3mlUhqI/E5EYC3JGoRi34Pgf5i8kGgzN104NlpyRN6qCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T01:08:49.220382Z"},"content_sha256":"1fb750e24c1408a81151f035c7413165232c46e059e96fb3f4950b69411dbbef","schema_version":"1.0","event_id":"sha256:1fb750e24c1408a81151f035c7413165232c46e059e96fb3f4950b69411dbbef"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MBYFMGYRKPVYJPUSLB7RFJBREP/bundle.json","state_url":"https://pith.science/pith/MBYFMGYRKPVYJPUSLB7RFJBREP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MBYFMGYRKPVYJPUSLB7RFJBREP/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":"2026-08-07T01:08:49Z","links":{"resolver":"https://pith.science/pith/MBYFMGYRKPVYJPUSLB7RFJBREP","bundle":"https://pith.science/pith/MBYFMGYRKPVYJPUSLB7RFJBREP/bundle.json","state":"https://pith.science/pith/MBYFMGYRKPVYJPUSLB7RFJBREP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MBYFMGYRKPVYJPUSLB7RFJBREP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:MBYFMGYRKPVYJPUSLB7RFJBREP","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":"908708a7014c6c8d1686a6ee15384e564fe122f376823d387e6bdc3f66a9d2b2","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2021-03-18T01:49:19Z","title_canon_sha256":"cf5bcc02f0064d286c9e4bf19decb9e5d573aed4b3ac7e81614788bd876adc69"},"schema_version":"1.0","source":{"id":"2103.09976","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.09976","created_at":"2026-07-05T02:51:39Z"},{"alias_kind":"arxiv_version","alias_value":"2103.09976v3","created_at":"2026-07-05T02:51:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.09976","created_at":"2026-07-05T02:51:39Z"},{"alias_kind":"pith_short_12","alias_value":"MBYFMGYRKPVY","created_at":"2026-07-05T02:51:39Z"},{"alias_kind":"pith_short_16","alias_value":"MBYFMGYRKPVYJPUS","created_at":"2026-07-05T02:51:39Z"},{"alias_kind":"pith_short_8","alias_value":"MBYFMGYR","created_at":"2026-07-05T02:51:39Z"}],"graph_snapshots":[{"event_id":"sha256:1fb750e24c1408a81151f035c7413165232c46e059e96fb3f4950b69411dbbef","target":"graph","created_at":"2026-07-05T02:51:39Z","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/2103.09976/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"There has been recent interest in the deployment of ab initio density matrix renormalization group computations on high performance computing platforms. Here, we introduce a reformulation of the conventional distributed memory ab initio DMRG algorithm that connects it to the conceptually simpler and advantageous sum of sub-Hamiltonians approach. Starting from this framework, we further explore a hierarchy of parallelism strategies, that includes (i) parallelism over the sum of sub-Hamiltonians, (ii) parallelism over sites, (iii) parallelism over normal and complementary operators, (iv) paralle","authors_text":"Garnet Kin-Lic Chan, Huanchen Zhai","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2021-03-18T01:49:19Z","title":"Low communication high performance ab initio density matrix renormalization group algorithms"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.09976","kind":"arxiv","version":3},"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:c02a9763630ba0e1e4cc8b7ccee4a7867e3a5edcbdc2ddbe7e3993506d0b2301","target":"record","created_at":"2026-07-05T02:51:39Z","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":"908708a7014c6c8d1686a6ee15384e564fe122f376823d387e6bdc3f66a9d2b2","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2021-03-18T01:49:19Z","title_canon_sha256":"cf5bcc02f0064d286c9e4bf19decb9e5d573aed4b3ac7e81614788bd876adc69"},"schema_version":"1.0","source":{"id":"2103.09976","kind":"arxiv","version":3}},"canonical_sha256":"6070561b1153eb84be92587f12a43123db51c32c8de67b13f1e5b0db224fde90","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6070561b1153eb84be92587f12a43123db51c32c8de67b13f1e5b0db224fde90","first_computed_at":"2026-07-05T02:51:39.656667Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:51:39.656667Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Kl7L6+wcTyFmZh0owFFdc69pZpZh5+BSaPQJ3+C6QO7b3yawQ8zogb35xOu7o93WhUb1U9WJEbEt83QHPW2LAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:51:39.657092Z","signed_message":"canonical_sha256_bytes"},"source_id":"2103.09976","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c02a9763630ba0e1e4cc8b7ccee4a7867e3a5edcbdc2ddbe7e3993506d0b2301","sha256:1fb750e24c1408a81151f035c7413165232c46e059e96fb3f4950b69411dbbef"],"state_sha256":"b8dbdf554d8be771ed4d44ecba727cc625801171f295c5d6dd7cb5de809485dd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ASZY+OpUafa0+9yvXIVOh5dLsmy7wsalu+VSpQsB42Ep/YWHvP433DnMh0BL13fHRkMVYmuPBjQBOELuwsLrAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T01:08:49.225578Z","bundle_sha256":"4c802c747807e18798fe1e9d38f0993dbdf1f1ab1a57c4b85018a285a00ebe88"}}