{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:YONVZQ7RSJNPBMT7J3VZEIMRZP","short_pith_number":"pith:YONVZQ7R","canonical_record":{"source":{"id":"2006.15644","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2020-06-28T16:27:26Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"131edd317b96df78020e69c12ebad61c61e7704cd347c20b40da6a0a6cf46378","abstract_canon_sha256":"f39fa4fcb533e72d2aa8841b73edc2ca048793fe84e4e0171ab4d0e1c687c4a9"},"schema_version":"1.0"},"canonical_sha256":"c39b5cc3f1925af0b27f4eeb922191cbe8a1b9ceabfd84b701c68d73621df3e0","source":{"kind":"arxiv","id":"2006.15644","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2006.15644","created_at":"2026-07-05T01:14:07Z"},{"alias_kind":"arxiv_version","alias_value":"2006.15644v1","created_at":"2026-07-05T01:14:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.15644","created_at":"2026-07-05T01:14:07Z"},{"alias_kind":"pith_short_12","alias_value":"YONVZQ7RSJNP","created_at":"2026-07-05T01:14:07Z"},{"alias_kind":"pith_short_16","alias_value":"YONVZQ7RSJNPBMT7","created_at":"2026-07-05T01:14:07Z"},{"alias_kind":"pith_short_8","alias_value":"YONVZQ7R","created_at":"2026-07-05T01:14:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:YONVZQ7RSJNPBMT7J3VZEIMRZP","target":"record","payload":{"canonical_record":{"source":{"id":"2006.15644","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2020-06-28T16:27:26Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"131edd317b96df78020e69c12ebad61c61e7704cd347c20b40da6a0a6cf46378","abstract_canon_sha256":"f39fa4fcb533e72d2aa8841b73edc2ca048793fe84e4e0171ab4d0e1c687c4a9"},"schema_version":"1.0"},"canonical_sha256":"c39b5cc3f1925af0b27f4eeb922191cbe8a1b9ceabfd84b701c68d73621df3e0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:14:07.656173Z","signature_b64":"denxmhtCDqJ80Ei0Ko/+MdQLX++DXnvONNGEVCX/c/1RRa8v+zhwOrlLD/Ag8gjneEHpCqHcTxCMhulkMiszDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c39b5cc3f1925af0b27f4eeb922191cbe8a1b9ceabfd84b701c68d73621df3e0","last_reissued_at":"2026-07-05T01:14:07.655670Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:14:07.655670Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2006.15644","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":"2026-07-05T01:14:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZnRoE4m3xN8Bkn4lcjJhTIpQBJCq0744D0Kj/gfTrr7XXjjw+9ri/uMNw2lU9o9GfGneYr5OVp9zGPzF3UNWCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T17:21:43.594894Z"},"content_sha256":"9723d320d79ce605ddf4a8afeb2f22bdfec51aa82875531fdd094ebc3826cb21","schema_version":"1.0","event_id":"sha256:9723d320d79ce605ddf4a8afeb2f22bdfec51aa82875531fdd094ebc3826cb21"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:YONVZQ7RSJNPBMT7J3VZEIMRZP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Application of variational policy gradient to atomic-scale materials synthesis","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"physics.comp-ph","authors_text":"Dan Lu, Lukas Vlcek, Nikolay Borodinov, Nouamane Laanait, Rama K. Vasudevan, Siyan Liu","submitted_at":"2020-06-28T16:27:26Z","abstract_excerpt":"Atomic-scale materials synthesis via layer deposition techniques present a unique opportunity to control material structures and yield systems that display unique functional properties that cannot be stabilized using traditional bulk synthetic routes. However, the deposition process itself presents a large, multidimensional space that is traditionally optimized via intuition and trial and error, slowing down progress. Here, we present an application of deep reinforcement learning to a simulated materials synthesis problem, utilizing the Stein variational policy gradient (SVPG) approach to trai"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.15644","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/2006.15644/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":"2026-07-05T01:14:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RY5Pnd0b5PCdpAgsAIl2874eNlTiELUaeprgyviawieQADqQVZdKqJV5WjAFOoDKrujc7dsYSDLWdnQkDhpXBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T17:21:43.595893Z"},"content_sha256":"3622fece0aa666b8dc364586a2828b76cf10ba934595dea1542d6b4b379e4f43","schema_version":"1.0","event_id":"sha256:3622fece0aa666b8dc364586a2828b76cf10ba934595dea1542d6b4b379e4f43"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YONVZQ7RSJNPBMT7J3VZEIMRZP/bundle.json","state_url":"https://pith.science/pith/YONVZQ7RSJNPBMT7J3VZEIMRZP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YONVZQ7RSJNPBMT7J3VZEIMRZP/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":"2026-08-03T17:21:43Z","links":{"resolver":"https://pith.science/pith/YONVZQ7RSJNPBMT7J3VZEIMRZP","bundle":"https://pith.science/pith/YONVZQ7RSJNPBMT7J3VZEIMRZP/bundle.json","state":"https://pith.science/pith/YONVZQ7RSJNPBMT7J3VZEIMRZP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YONVZQ7RSJNPBMT7J3VZEIMRZP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:YONVZQ7RSJNPBMT7J3VZEIMRZP","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":"f39fa4fcb533e72d2aa8841b73edc2ca048793fe84e4e0171ab4d0e1c687c4a9","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2020-06-28T16:27:26Z","title_canon_sha256":"131edd317b96df78020e69c12ebad61c61e7704cd347c20b40da6a0a6cf46378"},"schema_version":"1.0","source":{"id":"2006.15644","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2006.15644","created_at":"2026-07-05T01:14:07Z"},{"alias_kind":"arxiv_version","alias_value":"2006.15644v1","created_at":"2026-07-05T01:14:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.15644","created_at":"2026-07-05T01:14:07Z"},{"alias_kind":"pith_short_12","alias_value":"YONVZQ7RSJNP","created_at":"2026-07-05T01:14:07Z"},{"alias_kind":"pith_short_16","alias_value":"YONVZQ7RSJNPBMT7","created_at":"2026-07-05T01:14:07Z"},{"alias_kind":"pith_short_8","alias_value":"YONVZQ7R","created_at":"2026-07-05T01:14:07Z"}],"graph_snapshots":[{"event_id":"sha256:3622fece0aa666b8dc364586a2828b76cf10ba934595dea1542d6b4b379e4f43","target":"graph","created_at":"2026-07-05T01:14:07Z","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/2006.15644/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Atomic-scale materials synthesis via layer deposition techniques present a unique opportunity to control material structures and yield systems that display unique functional properties that cannot be stabilized using traditional bulk synthetic routes. However, the deposition process itself presents a large, multidimensional space that is traditionally optimized via intuition and trial and error, slowing down progress. Here, we present an application of deep reinforcement learning to a simulated materials synthesis problem, utilizing the Stein variational policy gradient (SVPG) approach to trai","authors_text":"Dan Lu, Lukas Vlcek, Nikolay Borodinov, Nouamane Laanait, Rama K. Vasudevan, Siyan Liu","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2020-06-28T16:27:26Z","title":"Application of variational policy gradient to atomic-scale materials synthesis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.15644","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":"sha256:9723d320d79ce605ddf4a8afeb2f22bdfec51aa82875531fdd094ebc3826cb21","target":"record","created_at":"2026-07-05T01:14:07Z","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":"f39fa4fcb533e72d2aa8841b73edc2ca048793fe84e4e0171ab4d0e1c687c4a9","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2020-06-28T16:27:26Z","title_canon_sha256":"131edd317b96df78020e69c12ebad61c61e7704cd347c20b40da6a0a6cf46378"},"schema_version":"1.0","source":{"id":"2006.15644","kind":"arxiv","version":1}},"canonical_sha256":"c39b5cc3f1925af0b27f4eeb922191cbe8a1b9ceabfd84b701c68d73621df3e0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c39b5cc3f1925af0b27f4eeb922191cbe8a1b9ceabfd84b701c68d73621df3e0","first_computed_at":"2026-07-05T01:14:07.655670Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:14:07.655670Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"denxmhtCDqJ80Ei0Ko/+MdQLX++DXnvONNGEVCX/c/1RRa8v+zhwOrlLD/Ag8gjneEHpCqHcTxCMhulkMiszDw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:14:07.656173Z","signed_message":"canonical_sha256_bytes"},"source_id":"2006.15644","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9723d320d79ce605ddf4a8afeb2f22bdfec51aa82875531fdd094ebc3826cb21","sha256:3622fece0aa666b8dc364586a2828b76cf10ba934595dea1542d6b4b379e4f43"],"state_sha256":"ff60f4a1e590dadb40831d8f49998dfea908a82245d8e7da1e50db4949287e9a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Qhql3fotBv7jwn3VKrC7H66KUfSx5IFW7fWEbaAo+ili3/piTSfFU5yXd+mucKPe5vtmb6G75Thpiy8F+RpSDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T17:21:43.601160Z","bundle_sha256":"c3db752c44e8de228b26b1c78b2d639646674607555d80a30d1817d1197c0a94"}}