{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:XSXAETM74RJ2CITLFHRXF673D5","short_pith_number":"pith:XSXAETM7","canonical_record":{"source":{"id":"2607.15067","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2026-07-16T14:38:23Z","cross_cats_sorted":[],"title_canon_sha256":"cadc475ec23cadcf9d5393bcd0c3440cfc50ffbbe205cca33ee63a73f73e3770","abstract_canon_sha256":"69b4cbd60c5d7ccb70025d972e60dab870cb1196318d0e7e2d1d0efcdbd051b4"},"schema_version":"1.0"},"canonical_sha256":"bcae024d9fe453a1226b29e372fbfb1f7b7b8f23ab349637f5939889492fcc22","source":{"kind":"arxiv","id":"2607.15067","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.15067","created_at":"2026-07-17T01:22:07Z"},{"alias_kind":"arxiv_version","alias_value":"2607.15067v1","created_at":"2026-07-17T01:22:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.15067","created_at":"2026-07-17T01:22:07Z"},{"alias_kind":"pith_short_12","alias_value":"XSXAETM74RJ2","created_at":"2026-07-17T01:22:07Z"},{"alias_kind":"pith_short_16","alias_value":"XSXAETM74RJ2CITL","created_at":"2026-07-17T01:22:07Z"},{"alias_kind":"pith_short_8","alias_value":"XSXAETM7","created_at":"2026-07-17T01:22:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:XSXAETM74RJ2CITLFHRXF673D5","target":"record","payload":{"canonical_record":{"source":{"id":"2607.15067","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2026-07-16T14:38:23Z","cross_cats_sorted":[],"title_canon_sha256":"cadc475ec23cadcf9d5393bcd0c3440cfc50ffbbe205cca33ee63a73f73e3770","abstract_canon_sha256":"69b4cbd60c5d7ccb70025d972e60dab870cb1196318d0e7e2d1d0efcdbd051b4"},"schema_version":"1.0"},"canonical_sha256":"bcae024d9fe453a1226b29e372fbfb1f7b7b8f23ab349637f5939889492fcc22","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-17T01:22:07.810243Z","signature_b64":"9g9XP4LhME7Do95c6XNBUvzCyhvFoo2eQRkWYZflZ6b/rSAuy76AKmLWT8RERLJu+ttxsqS/1lYGid/nSdmlDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bcae024d9fe453a1226b29e372fbfb1f7b7b8f23ab349637f5939889492fcc22","last_reissued_at":"2026-07-17T01:22:07.809400Z","signature_status":"signed_v1","first_computed_at":"2026-07-17T01:22:07.809400Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.15067","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":"2026-07-17T01:22:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UEqUO1M2dz9WDfQ1DuvSpp19J8ke7pPj8ZFVnJ00BzRB0t/yAaRLRL2KPTmYxRA7i7Ir9nxEKFD3DCKe2WVuBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T16:04:33.103668Z"},"content_sha256":"e51d20cc8285869c82dfe5f332eb6f1c70704cb8ae5112099d9ce98c45cff371","schema_version":"1.0","event_id":"sha256:e51d20cc8285869c82dfe5f332eb6f1c70704cb8ae5112099d9ce98c45cff371"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:XSXAETM74RJ2CITLFHRXF673D5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Kernel weighted importance sampling for off-policy evaluation in contextual bandits","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cs.LG","authors_text":"Erica E.M. Moodie, Joshua Spear, Matthieu Komorowski, Neil J Sebire, Rebecca Pope","submitted_at":"2026-07-16T14:38:23Z","abstract_excerpt":"This article presents a novel estimator for performing off-policy evaluation using only offline data for contextual bandits. The proposed estimator, Kernel-WIS is demonstrated to be asymptotically consistent and to empirically outperform strong baselines (including vanilla weighted importance sampling), particularly under complex conditions including behaviour policy miss-specification. The benefit of Kernel-WIS is derived from combining the bounded property of vanilla weighted importance sampling with the linearity of vanilla importance sampling."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.15067","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/2607.15067/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":"2026-07-17T01:22:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LBKjhJhbG1tnRDAIcfFZF3IXyQ8XUhGYFUrLxWkqNMD351OJ1rPIJzf4PDm9MQbCJh0MWhZ3y+qtRNb4/9+aAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T16:04:33.104163Z"},"content_sha256":"ebc2688e50cb7e2312ed03282a98793c843f088b28110b4bfc02f9c367b2cbb1","schema_version":"1.0","event_id":"sha256:ebc2688e50cb7e2312ed03282a98793c843f088b28110b4bfc02f9c367b2cbb1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XSXAETM74RJ2CITLFHRXF673D5/bundle.json","state_url":"https://pith.science/pith/XSXAETM74RJ2CITLFHRXF673D5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XSXAETM74RJ2CITLFHRXF673D5/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":"2026-08-03T16:04:33Z","links":{"resolver":"https://pith.science/pith/XSXAETM74RJ2CITLFHRXF673D5","bundle":"https://pith.science/pith/XSXAETM74RJ2CITLFHRXF673D5/bundle.json","state":"https://pith.science/pith/XSXAETM74RJ2CITLFHRXF673D5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XSXAETM74RJ2CITLFHRXF673D5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:XSXAETM74RJ2CITLFHRXF673D5","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":"69b4cbd60c5d7ccb70025d972e60dab870cb1196318d0e7e2d1d0efcdbd051b4","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2026-07-16T14:38:23Z","title_canon_sha256":"cadc475ec23cadcf9d5393bcd0c3440cfc50ffbbe205cca33ee63a73f73e3770"},"schema_version":"1.0","source":{"id":"2607.15067","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.15067","created_at":"2026-07-17T01:22:07Z"},{"alias_kind":"arxiv_version","alias_value":"2607.15067v1","created_at":"2026-07-17T01:22:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.15067","created_at":"2026-07-17T01:22:07Z"},{"alias_kind":"pith_short_12","alias_value":"XSXAETM74RJ2","created_at":"2026-07-17T01:22:07Z"},{"alias_kind":"pith_short_16","alias_value":"XSXAETM74RJ2CITL","created_at":"2026-07-17T01:22:07Z"},{"alias_kind":"pith_short_8","alias_value":"XSXAETM7","created_at":"2026-07-17T01:22:07Z"}],"graph_snapshots":[{"event_id":"sha256:ebc2688e50cb7e2312ed03282a98793c843f088b28110b4bfc02f9c367b2cbb1","target":"graph","created_at":"2026-07-17T01:22:07Z","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/2607.15067/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This article presents a novel estimator for performing off-policy evaluation using only offline data for contextual bandits. The proposed estimator, Kernel-WIS is demonstrated to be asymptotically consistent and to empirically outperform strong baselines (including vanilla weighted importance sampling), particularly under complex conditions including behaviour policy miss-specification. The benefit of Kernel-WIS is derived from combining the bounded property of vanilla weighted importance sampling with the linearity of vanilla importance sampling.","authors_text":"Erica E.M. Moodie, Joshua Spear, Matthieu Komorowski, Neil J Sebire, Rebecca Pope","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2026-07-16T14:38:23Z","title":"Kernel weighted importance sampling for off-policy evaluation in contextual bandits"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.15067","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:e51d20cc8285869c82dfe5f332eb6f1c70704cb8ae5112099d9ce98c45cff371","target":"record","created_at":"2026-07-17T01:22:07Z","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":"69b4cbd60c5d7ccb70025d972e60dab870cb1196318d0e7e2d1d0efcdbd051b4","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LG","submitted_at":"2026-07-16T14:38:23Z","title_canon_sha256":"cadc475ec23cadcf9d5393bcd0c3440cfc50ffbbe205cca33ee63a73f73e3770"},"schema_version":"1.0","source":{"id":"2607.15067","kind":"arxiv","version":1}},"canonical_sha256":"bcae024d9fe453a1226b29e372fbfb1f7b7b8f23ab349637f5939889492fcc22","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bcae024d9fe453a1226b29e372fbfb1f7b7b8f23ab349637f5939889492fcc22","first_computed_at":"2026-07-17T01:22:07.809400Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-17T01:22:07.809400Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9g9XP4LhME7Do95c6XNBUvzCyhvFoo2eQRkWYZflZ6b/rSAuy76AKmLWT8RERLJu+ttxsqS/1lYGid/nSdmlDQ==","signature_status":"signed_v1","signed_at":"2026-07-17T01:22:07.810243Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.15067","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e51d20cc8285869c82dfe5f332eb6f1c70704cb8ae5112099d9ce98c45cff371","sha256:ebc2688e50cb7e2312ed03282a98793c843f088b28110b4bfc02f9c367b2cbb1"],"state_sha256":"edca0a72f07587d5457678a5268b75450a0d4c5a3199f3900d9c022ac02bd313"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EDY40gjsyT9yyu7EdzOketBeY0x2FlkD/WYAIToGgBiJdd2tFDb3bRm/iVNfahZjdFJkcIudgA7pbJqBQSxeBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T16:04:33.108081Z","bundle_sha256":"3f746ebbbea7a5a12fa31666fd830210900032c52b5a90eec7cb3c6be4dbf377"}}