{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:M3NBST73Z6R6QRHDV2ICAUBKPF","short_pith_number":"pith:M3NBST73","canonical_record":{"source":{"id":"1904.08993","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2019-04-18T20:14:02Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"982a3f6b02bb85556759ee1fc719dca2144fd73c178c59bacf26ffc0c3080fe3","abstract_canon_sha256":"db6414a106ee8e3745329ebd745f50517180af7edf87aed9e90531e9b2a17901"},"schema_version":"1.0"},"canonical_sha256":"66da194ffbcfa3e844e3ae9020502a7947cc6962b43c5132c31ad15513a414a8","source":{"kind":"arxiv","id":"1904.08993","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.08993","created_at":"2026-05-17T23:45:51Z"},{"alias_kind":"arxiv_version","alias_value":"1904.08993v2","created_at":"2026-05-17T23:45:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.08993","created_at":"2026-05-17T23:45:51Z"},{"alias_kind":"pith_short_12","alias_value":"M3NBST73Z6R6","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"M3NBST73Z6R6QRHD","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"M3NBST73","created_at":"2026-05-18T12:33:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:M3NBST73Z6R6QRHDV2ICAUBKPF","target":"record","payload":{"canonical_record":{"source":{"id":"1904.08993","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2019-04-18T20:14:02Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"982a3f6b02bb85556759ee1fc719dca2144fd73c178c59bacf26ffc0c3080fe3","abstract_canon_sha256":"db6414a106ee8e3745329ebd745f50517180af7edf87aed9e90531e9b2a17901"},"schema_version":"1.0"},"canonical_sha256":"66da194ffbcfa3e844e3ae9020502a7947cc6962b43c5132c31ad15513a414a8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:45:51.733022Z","signature_b64":"Lp2MFAauLK/a1uA2zY1cjw9ToWZlZF8uBgev8AuJr2mm/zKlSgvq058EMP5mTHLb0GkCJXC1f2A0jh6scAiPAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"66da194ffbcfa3e844e3ae9020502a7947cc6962b43c5132c31ad15513a414a8","last_reissued_at":"2026-05-17T23:45:51.732527Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:45:51.732527Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.08993","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:45:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rm4LHIR+yEp7Fp4Rq3TAXC7do0/HiCLPDnpQUdQYNHKTOXuaoH4Q247g9mQ+jv5N8eb9Qdi2YFfUcE/HK5gEAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T21:16:28.490112Z"},"content_sha256":"9cc9855168b8ff884f3d2bcda973dd475545122ab4be1e295c8c7a5627adcf0e","schema_version":"1.0","event_id":"sha256:9cc9855168b8ff884f3d2bcda973dd475545122ab4be1e295c8c7a5627adcf0e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:M3NBST73Z6R6QRHDV2ICAUBKPF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Playgol: learning programs through play","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.AI"],"primary_cat":"cs.LG","authors_text":"Andrew Cropper","submitted_at":"2019-04-18T20:14:02Z","abstract_excerpt":"Children learn though play. We introduce the analogous idea of learning programs through play. In this approach, a program induction system (the learner) is given a set of tasks and initial background knowledge. Before solving the tasks, the learner enters an unsupervised playing stage where it creates its own tasks to solve, tries to solve them, and saves any solutions (programs) to the background knowledge. After the playing stage is finished, the learner enters the supervised building stage where it tries to solve the user-supplied tasks and can reuse solutions learnt whilst playing. The id"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.08993","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-17T23:45:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rWWqsNJMVwwN9m3a07aqSwrcFj6z4Y9bApMPIq3m+hijEXA4HaoEbKsdNiqg0uiE1qs4NOyu8+VCiYPVCziOAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T21:16:28.490804Z"},"content_sha256":"36d3dcc010cbe35c15a07e3541da803e658284c145cd635fbd9db1c22851abd6","schema_version":"1.0","event_id":"sha256:36d3dcc010cbe35c15a07e3541da803e658284c145cd635fbd9db1c22851abd6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/M3NBST73Z6R6QRHDV2ICAUBKPF/bundle.json","state_url":"https://pith.science/pith/M3NBST73Z6R6QRHDV2ICAUBKPF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/M3NBST73Z6R6QRHDV2ICAUBKPF/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":"2026-05-25T21:16:28Z","links":{"resolver":"https://pith.science/pith/M3NBST73Z6R6QRHDV2ICAUBKPF","bundle":"https://pith.science/pith/M3NBST73Z6R6QRHDV2ICAUBKPF/bundle.json","state":"https://pith.science/pith/M3NBST73Z6R6QRHDV2ICAUBKPF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/M3NBST73Z6R6QRHDV2ICAUBKPF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:M3NBST73Z6R6QRHDV2ICAUBKPF","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":"db6414a106ee8e3745329ebd745f50517180af7edf87aed9e90531e9b2a17901","cross_cats_sorted":["cs.AI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2019-04-18T20:14:02Z","title_canon_sha256":"982a3f6b02bb85556759ee1fc719dca2144fd73c178c59bacf26ffc0c3080fe3"},"schema_version":"1.0","source":{"id":"1904.08993","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.08993","created_at":"2026-05-17T23:45:51Z"},{"alias_kind":"arxiv_version","alias_value":"1904.08993v2","created_at":"2026-05-17T23:45:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.08993","created_at":"2026-05-17T23:45:51Z"},{"alias_kind":"pith_short_12","alias_value":"M3NBST73Z6R6","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"M3NBST73Z6R6QRHD","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"M3NBST73","created_at":"2026-05-18T12:33:21Z"}],"graph_snapshots":[{"event_id":"sha256:36d3dcc010cbe35c15a07e3541da803e658284c145cd635fbd9db1c22851abd6","target":"graph","created_at":"2026-05-17T23:45:51Z","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"},"paper":{"abstract_excerpt":"Children learn though play. We introduce the analogous idea of learning programs through play. In this approach, a program induction system (the learner) is given a set of tasks and initial background knowledge. Before solving the tasks, the learner enters an unsupervised playing stage where it creates its own tasks to solve, tries to solve them, and saves any solutions (programs) to the background knowledge. After the playing stage is finished, the learner enters the supervised building stage where it tries to solve the user-supplied tasks and can reuse solutions learnt whilst playing. The id","authors_text":"Andrew Cropper","cross_cats":["cs.AI"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2019-04-18T20:14:02Z","title":"Playgol: learning programs through play"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.08993","kind":"arxiv","version":2},"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":"sha256:9cc9855168b8ff884f3d2bcda973dd475545122ab4be1e295c8c7a5627adcf0e","target":"record","created_at":"2026-05-17T23:45:51Z","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":"db6414a106ee8e3745329ebd745f50517180af7edf87aed9e90531e9b2a17901","cross_cats_sorted":["cs.AI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2019-04-18T20:14:02Z","title_canon_sha256":"982a3f6b02bb85556759ee1fc719dca2144fd73c178c59bacf26ffc0c3080fe3"},"schema_version":"1.0","source":{"id":"1904.08993","kind":"arxiv","version":2}},"canonical_sha256":"66da194ffbcfa3e844e3ae9020502a7947cc6962b43c5132c31ad15513a414a8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"66da194ffbcfa3e844e3ae9020502a7947cc6962b43c5132c31ad15513a414a8","first_computed_at":"2026-05-17T23:45:51.732527Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:45:51.732527Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Lp2MFAauLK/a1uA2zY1cjw9ToWZlZF8uBgev8AuJr2mm/zKlSgvq058EMP5mTHLb0GkCJXC1f2A0jh6scAiPAw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:45:51.733022Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.08993","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9cc9855168b8ff884f3d2bcda973dd475545122ab4be1e295c8c7a5627adcf0e","sha256:36d3dcc010cbe35c15a07e3541da803e658284c145cd635fbd9db1c22851abd6"],"state_sha256":"5830662e3c2cf3bf6dd73d738586fe3f550eb4c1214e3684bfba55afb5b0a8a5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KPUlksUXhw+SFNU1UZx1UDT8i85cN4LcdlhznIkLiJf71OmAxuloI8+z3zqFHw+6XqJA4eHE5MXRf57Su+3pBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T21:16:28.494861Z","bundle_sha256":"506464e6a3a1ffddf89b434cdb7976a62bd0d29aa1258e6a3cca61576ff2be1b"}}