{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:NVNMP4W3YD3TM3RPTNSUBOEMQ7","short_pith_number":"pith:NVNMP4W3","canonical_record":{"source":{"id":"2606.05230","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ML","submitted_at":"2026-06-02T22:47:09Z","cross_cats_sorted":["cs.LG","eess.SP"],"title_canon_sha256":"11bc009ef5cdfe42cfb5c1c589afbe6b962f2ebc05705b2d4a9446a17bfc6cf8","abstract_canon_sha256":"b5064089322bbccb8eaa92541a6fa2f72b383dd5d58fb6639d81845cb539bfae"},"schema_version":"1.0"},"canonical_sha256":"6d5ac7f2dbc0f7366e2f9b6540b88c87dc020562b31b978ec26f95b1a66500cf","source":{"kind":"arxiv","id":"2606.05230","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.05230","created_at":"2026-06-05T00:13:49Z"},{"alias_kind":"arxiv_version","alias_value":"2606.05230v1","created_at":"2026-06-05T00:13:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.05230","created_at":"2026-06-05T00:13:49Z"},{"alias_kind":"pith_short_12","alias_value":"NVNMP4W3YD3T","created_at":"2026-06-05T00:13:49Z"},{"alias_kind":"pith_short_16","alias_value":"NVNMP4W3YD3TM3RP","created_at":"2026-06-05T00:13:49Z"},{"alias_kind":"pith_short_8","alias_value":"NVNMP4W3","created_at":"2026-06-05T00:13:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:NVNMP4W3YD3TM3RPTNSUBOEMQ7","target":"record","payload":{"canonical_record":{"source":{"id":"2606.05230","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ML","submitted_at":"2026-06-02T22:47:09Z","cross_cats_sorted":["cs.LG","eess.SP"],"title_canon_sha256":"11bc009ef5cdfe42cfb5c1c589afbe6b962f2ebc05705b2d4a9446a17bfc6cf8","abstract_canon_sha256":"b5064089322bbccb8eaa92541a6fa2f72b383dd5d58fb6639d81845cb539bfae"},"schema_version":"1.0"},"canonical_sha256":"6d5ac7f2dbc0f7366e2f9b6540b88c87dc020562b31b978ec26f95b1a66500cf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-05T00:13:49.469595Z","signature_b64":"Kjs6Qnvv/WUx43gQt3sEQIKfODwUZTCCT7k0JOZPB7O12hRdCgu194CdMf+zrEYcVg3BFCh+V4YmVRO0f1L8DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6d5ac7f2dbc0f7366e2f9b6540b88c87dc020562b31b978ec26f95b1a66500cf","last_reissued_at":"2026-06-05T00:13:49.469064Z","signature_status":"signed_v1","first_computed_at":"2026-06-05T00:13:49.469064Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.05230","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":"2026-06-05T00:13:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kBRpmQos9v00Yy+0uLsLdLRsDhSI21lYPkxD2jlHiudKiSbaZTZP/IDZm0GrjH2VydzibcmyB1+P6qrmxbpsDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T16:06:25.757738Z"},"content_sha256":"7bf58083e08922290d44bdee3cee8f41db80959ac52dc28fe9bab4192c6d5735","schema_version":"1.0","event_id":"sha256:7bf58083e08922290d44bdee3cee8f41db80959ac52dc28fe9bab4192c6d5735"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:NVNMP4W3YD3TM3RPTNSUBOEMQ7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Central Description Length (CDL) Clustering Validation Index","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.LG","eess.SP"],"primary_cat":"stat.ML","authors_text":"Mahdi Shamsi, Soosan Beheshti","submitted_at":"2026-06-02T22:47:09Z","abstract_excerpt":"Selecting a clustering algorithm and its hyperparameters without labels is a common difficulty in engineering machine learning pipelines that work with unsupervised analysis of sensor, image, or process data. Clustering validation indices (CVIs) provide internal scores for ranking candidate clusterings, but most popular CVIs are built from Euclidean compactness and separation terms and so tend to favour compact, convex partitions. Their performance is known to degrade on non convex, irregular, or variable density data, where kernel transformations or alternative distance measures are typically"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.05230","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/2606.05230/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":"2026-06-05T00:13:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E68RtJlfzvyYZHFSqB4bue8Mf38qGdoqqKg08WJtg0PL9opq/BLTRS8jQV6cAYQm1WNLPXG5RiE8Gr7CnVYbBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T16:06:25.758116Z"},"content_sha256":"3101b3d89f5449d64ae85722d043677eadaca46355c613e41617ec19fb4ba0fd","schema_version":"1.0","event_id":"sha256:3101b3d89f5449d64ae85722d043677eadaca46355c613e41617ec19fb4ba0fd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NVNMP4W3YD3TM3RPTNSUBOEMQ7/bundle.json","state_url":"https://pith.science/pith/NVNMP4W3YD3TM3RPTNSUBOEMQ7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NVNMP4W3YD3TM3RPTNSUBOEMQ7/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":"2026-06-23T16:06:25Z","links":{"resolver":"https://pith.science/pith/NVNMP4W3YD3TM3RPTNSUBOEMQ7","bundle":"https://pith.science/pith/NVNMP4W3YD3TM3RPTNSUBOEMQ7/bundle.json","state":"https://pith.science/pith/NVNMP4W3YD3TM3RPTNSUBOEMQ7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NVNMP4W3YD3TM3RPTNSUBOEMQ7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:NVNMP4W3YD3TM3RPTNSUBOEMQ7","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":"b5064089322bbccb8eaa92541a6fa2f72b383dd5d58fb6639d81845cb539bfae","cross_cats_sorted":["cs.LG","eess.SP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ML","submitted_at":"2026-06-02T22:47:09Z","title_canon_sha256":"11bc009ef5cdfe42cfb5c1c589afbe6b962f2ebc05705b2d4a9446a17bfc6cf8"},"schema_version":"1.0","source":{"id":"2606.05230","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.05230","created_at":"2026-06-05T00:13:49Z"},{"alias_kind":"arxiv_version","alias_value":"2606.05230v1","created_at":"2026-06-05T00:13:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.05230","created_at":"2026-06-05T00:13:49Z"},{"alias_kind":"pith_short_12","alias_value":"NVNMP4W3YD3T","created_at":"2026-06-05T00:13:49Z"},{"alias_kind":"pith_short_16","alias_value":"NVNMP4W3YD3TM3RP","created_at":"2026-06-05T00:13:49Z"},{"alias_kind":"pith_short_8","alias_value":"NVNMP4W3","created_at":"2026-06-05T00:13:49Z"}],"graph_snapshots":[{"event_id":"sha256:3101b3d89f5449d64ae85722d043677eadaca46355c613e41617ec19fb4ba0fd","target":"graph","created_at":"2026-06-05T00:13:49Z","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/2606.05230/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Selecting a clustering algorithm and its hyperparameters without labels is a common difficulty in engineering machine learning pipelines that work with unsupervised analysis of sensor, image, or process data. Clustering validation indices (CVIs) provide internal scores for ranking candidate clusterings, but most popular CVIs are built from Euclidean compactness and separation terms and so tend to favour compact, convex partitions. Their performance is known to degrade on non convex, irregular, or variable density data, where kernel transformations or alternative distance measures are typically","authors_text":"Mahdi Shamsi, Soosan Beheshti","cross_cats":["cs.LG","eess.SP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ML","submitted_at":"2026-06-02T22:47:09Z","title":"Central Description Length (CDL) Clustering Validation Index"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.05230","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":"sha256:7bf58083e08922290d44bdee3cee8f41db80959ac52dc28fe9bab4192c6d5735","target":"record","created_at":"2026-06-05T00:13:49Z","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":"b5064089322bbccb8eaa92541a6fa2f72b383dd5d58fb6639d81845cb539bfae","cross_cats_sorted":["cs.LG","eess.SP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ML","submitted_at":"2026-06-02T22:47:09Z","title_canon_sha256":"11bc009ef5cdfe42cfb5c1c589afbe6b962f2ebc05705b2d4a9446a17bfc6cf8"},"schema_version":"1.0","source":{"id":"2606.05230","kind":"arxiv","version":1}},"canonical_sha256":"6d5ac7f2dbc0f7366e2f9b6540b88c87dc020562b31b978ec26f95b1a66500cf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6d5ac7f2dbc0f7366e2f9b6540b88c87dc020562b31b978ec26f95b1a66500cf","first_computed_at":"2026-06-05T00:13:49.469064Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-05T00:13:49.469064Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Kjs6Qnvv/WUx43gQt3sEQIKfODwUZTCCT7k0JOZPB7O12hRdCgu194CdMf+zrEYcVg3BFCh+V4YmVRO0f1L8DQ==","signature_status":"signed_v1","signed_at":"2026-06-05T00:13:49.469595Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.05230","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7bf58083e08922290d44bdee3cee8f41db80959ac52dc28fe9bab4192c6d5735","sha256:3101b3d89f5449d64ae85722d043677eadaca46355c613e41617ec19fb4ba0fd"],"state_sha256":"971a3f57a675949b9e910c3ec2c19a74fb10b12f0e4a5c830f95ee73bc7c8316"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IwDWun0FQwMx4aIqtNCEYCFT8/n3MHicedPNClSQV4eM6rt8WNiUqH7fqPyRmM4OZP9koxqjLpCITDDJ3PT+CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T16:06:25.760187Z","bundle_sha256":"35de00de1a2bcfcdef8af880e955c0741bcce5b5bc644380834d599cd4f7de3b"}}