{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:56LWGFLVBQGC52WPYGXRJORW23","short_pith_number":"pith:56LWGFLV","canonical_record":{"source":{"id":"2509.00199","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IR","submitted_at":"2025-08-29T19:23:04Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"ad33eb1e66610e6c888ceebd5d43ac44ff052c7699e3c80fb00ba53cf20d6e55","abstract_canon_sha256":"24aeca2fc0eed37d7cd1240c661c5db07850facd7bbd928492091e415dcff26d"},"schema_version":"1.0"},"canonical_sha256":"ef976315750c0c2eeacfc1af14ba36d6fecda891c973a59dc04da6537e182c3c","source":{"kind":"arxiv","id":"2509.00199","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.00199","created_at":"2026-07-05T12:02:11Z"},{"alias_kind":"arxiv_version","alias_value":"2509.00199v1","created_at":"2026-07-05T12:02:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.00199","created_at":"2026-07-05T12:02:11Z"},{"alias_kind":"pith_short_12","alias_value":"56LWGFLVBQGC","created_at":"2026-07-05T12:02:11Z"},{"alias_kind":"pith_short_16","alias_value":"56LWGFLVBQGC52WP","created_at":"2026-07-05T12:02:11Z"},{"alias_kind":"pith_short_8","alias_value":"56LWGFLV","created_at":"2026-07-05T12:02:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:56LWGFLVBQGC52WPYGXRJORW23","target":"record","payload":{"canonical_record":{"source":{"id":"2509.00199","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IR","submitted_at":"2025-08-29T19:23:04Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"ad33eb1e66610e6c888ceebd5d43ac44ff052c7699e3c80fb00ba53cf20d6e55","abstract_canon_sha256":"24aeca2fc0eed37d7cd1240c661c5db07850facd7bbd928492091e415dcff26d"},"schema_version":"1.0"},"canonical_sha256":"ef976315750c0c2eeacfc1af14ba36d6fecda891c973a59dc04da6537e182c3c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T12:02:11.127594Z","signature_b64":"0uRdn+a3qaWPNlQ3zA3tP29kn2n9T6lrkxss/3LP0QGttADXcjlxIFJAHZnt1fpNeP1IrlRPCTeVD7j22H7sBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ef976315750c0c2eeacfc1af14ba36d6fecda891c973a59dc04da6537e182c3c","last_reissued_at":"2026-07-05T12:02:11.127066Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T12:02:11.127066Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2509.00199","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":"2026-07-05T12:02:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fVN3ZXVqYqtw+6yfX0fpiUdOkDcTStNDlWjRtSY1llvM4bPBnEWjw2iG0rqG/YGQFSx8tO/5y+/xSSgeGNfmAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T03:25:31.699509Z"},"content_sha256":"4c66c7ba448887c34c42b77269faef749fc7f151113f5abe335894652b7eb7ea","schema_version":"1.0","event_id":"sha256:4c66c7ba448887c34c42b77269faef749fc7f151113f5abe335894652b7eb7ea"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:56LWGFLVBQGC52WPYGXRJORW23","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Algorithm Adaptation Bias in Recommendation System Online Experiments","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.LG"],"primary_cat":"cs.IR","authors_text":"Chen Zheng, Zhenyu Zhao","submitted_at":"2025-08-29T19:23:04Z","abstract_excerpt":"Online experiments (A/B tests) are widely regarded as the gold standard for evaluating recommender system variants and guiding launch decisions. However, a variety of biases can distort the results of the experiment and mislead decision-making. An underexplored but critical bias is algorithm adaptation effect. This bias arises from the flywheel dynamics among production models, user data, and training pipelines: new models are evaluated on user data whose distributions are shaped by the incumbent system or tested only in a small treatment group. As a result, the measured effect of a new produc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.00199","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/2509.00199/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":"2026-07-05T12:02:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jF1ZKG8aC9D2/VPXorDueIQNxRq81vteMcyINdGYGGiYWxu1LCneL6u0UBsfjL7Y+ugJJ/YHxPjMd7kFoplrCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T03:25:31.700030Z"},"content_sha256":"378262e22a531eba49cab7fcf0599beb62fead54be92cbbfa39cb662bb18325f","schema_version":"1.0","event_id":"sha256:378262e22a531eba49cab7fcf0599beb62fead54be92cbbfa39cb662bb18325f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/56LWGFLVBQGC52WPYGXRJORW23/bundle.json","state_url":"https://pith.science/pith/56LWGFLVBQGC52WPYGXRJORW23/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/56LWGFLVBQGC52WPYGXRJORW23/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":"2026-08-14T03:25:31Z","links":{"resolver":"https://pith.science/pith/56LWGFLVBQGC52WPYGXRJORW23","bundle":"https://pith.science/pith/56LWGFLVBQGC52WPYGXRJORW23/bundle.json","state":"https://pith.science/pith/56LWGFLVBQGC52WPYGXRJORW23/state.json","well_known_bundle":"https://pith.science/.well-known/pith/56LWGFLVBQGC52WPYGXRJORW23/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:56LWGFLVBQGC52WPYGXRJORW23","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":"24aeca2fc0eed37d7cd1240c661c5db07850facd7bbd928492091e415dcff26d","cross_cats_sorted":["cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IR","submitted_at":"2025-08-29T19:23:04Z","title_canon_sha256":"ad33eb1e66610e6c888ceebd5d43ac44ff052c7699e3c80fb00ba53cf20d6e55"},"schema_version":"1.0","source":{"id":"2509.00199","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.00199","created_at":"2026-07-05T12:02:11Z"},{"alias_kind":"arxiv_version","alias_value":"2509.00199v1","created_at":"2026-07-05T12:02:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.00199","created_at":"2026-07-05T12:02:11Z"},{"alias_kind":"pith_short_12","alias_value":"56LWGFLVBQGC","created_at":"2026-07-05T12:02:11Z"},{"alias_kind":"pith_short_16","alias_value":"56LWGFLVBQGC52WP","created_at":"2026-07-05T12:02:11Z"},{"alias_kind":"pith_short_8","alias_value":"56LWGFLV","created_at":"2026-07-05T12:02:11Z"}],"graph_snapshots":[{"event_id":"sha256:378262e22a531eba49cab7fcf0599beb62fead54be92cbbfa39cb662bb18325f","target":"graph","created_at":"2026-07-05T12:02:11Z","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/2509.00199/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Online experiments (A/B tests) are widely regarded as the gold standard for evaluating recommender system variants and guiding launch decisions. However, a variety of biases can distort the results of the experiment and mislead decision-making. An underexplored but critical bias is algorithm adaptation effect. This bias arises from the flywheel dynamics among production models, user data, and training pipelines: new models are evaluated on user data whose distributions are shaped by the incumbent system or tested only in a small treatment group. As a result, the measured effect of a new produc","authors_text":"Chen Zheng, Zhenyu Zhao","cross_cats":["cs.LG"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IR","submitted_at":"2025-08-29T19:23:04Z","title":"Algorithm Adaptation Bias in Recommendation System Online Experiments"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.00199","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":"sha256:4c66c7ba448887c34c42b77269faef749fc7f151113f5abe335894652b7eb7ea","target":"record","created_at":"2026-07-05T12:02:11Z","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":"24aeca2fc0eed37d7cd1240c661c5db07850facd7bbd928492091e415dcff26d","cross_cats_sorted":["cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.IR","submitted_at":"2025-08-29T19:23:04Z","title_canon_sha256":"ad33eb1e66610e6c888ceebd5d43ac44ff052c7699e3c80fb00ba53cf20d6e55"},"schema_version":"1.0","source":{"id":"2509.00199","kind":"arxiv","version":1}},"canonical_sha256":"ef976315750c0c2eeacfc1af14ba36d6fecda891c973a59dc04da6537e182c3c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ef976315750c0c2eeacfc1af14ba36d6fecda891c973a59dc04da6537e182c3c","first_computed_at":"2026-07-05T12:02:11.127066Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T12:02:11.127066Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0uRdn+a3qaWPNlQ3zA3tP29kn2n9T6lrkxss/3LP0QGttADXcjlxIFJAHZnt1fpNeP1IrlRPCTeVD7j22H7sBA==","signature_status":"signed_v1","signed_at":"2026-07-05T12:02:11.127594Z","signed_message":"canonical_sha256_bytes"},"source_id":"2509.00199","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4c66c7ba448887c34c42b77269faef749fc7f151113f5abe335894652b7eb7ea","sha256:378262e22a531eba49cab7fcf0599beb62fead54be92cbbfa39cb662bb18325f"],"state_sha256":"c1fb9d83ad2e167853e03094576ce0ad6904a5ec0772b4b09dc454032a98c051"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hfpQlSrnDyC2+GlhOVkupwQuuKJwwZinkUEmC5mMqpNquN/OmmQXWNkB6vn+2zL23epTnzPUAFAKKMnmRCtLBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T03:25:31.705015Z","bundle_sha256":"e87681615296821ee63f71f02fde08e659d02750493c4aeb94a6bef37de182fe"}}