{
  "schema_version": "wide_deep_OPT_round3_summary_v1",
  "arm": "WDT_OPT",
  "round": 3,
  "status": "COMPLETE",
  "observed_at_utc": "2026-11-02T04:48:07.580166+00:00",
  "observed_at_beijing": "2026-11-02 12:48:07",
  "completed_at_utc": "2026-11-02T04:46:39.136471+00:00",
  "completed_at_beijing": "2026-11-02 12:46:39",
  "started_at_utc": "2026-11-02T03:44:15.763341+00:00",
  "questions": 44,
  "answers": 352,
  "seed_questions": 20,
  "seed_answers": 160,
  "seed_successes": 120,
  "previous_round_seed_successes": 125,
  "review_questions": 12,
  "new_questions": 12,
  "effective_questions": 17,
  "all_correct_questions": 20,
  "all_wrong_questions": 7,
  "effective_new_questions": 5,
  "effective_questions_definition": "同一道题的八份回答有对有错，能提供本轮主练的成败比较。",
  "new_difficulty_by_kind": {
    "deep_down": {
      "all_failed": 0,
      "all_succeeded": 2,
      "effective_questions": 0,
      "minimum_actions_delta_range": [
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        -2
      ],
      "questions": 2,
      "required_chain_depth_delta_range": [
        -1,
        -1
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    "deep_up": {
      "all_failed": 1,
      "all_succeeded": 1,
      "effective_questions": 3,
      "minimum_actions_delta_range": [
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        13
      ],
      "questions": 5,
      "required_chain_depth_delta_range": [
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    "wide": {
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      "all_succeeded": 3,
      "effective_questions": 2,
      "minimum_actions_delta_range": [
        0,
        1
      ],
      "questions": 5,
      "required_chain_depth_delta_range": [
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  "signal_coverage": {
    "failed_questions": 18,
    "first_answer_failed_questions": 12,
    "independent_student_answers": 0,
    "later_failures_considered": 6,
    "mixed_source_questions": 12,
    "regressed_question_ids": [
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      "generated:local_textcraft_280",
      "generated:local_textcraft_462",
      "generated:local_textcraft_328",
      "generated:cluster_wdt_r1_s18",
      "generated:cluster_wdt_r1_s5",
      "generated:cluster_wdt_opt_r2_s14"
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    "upward_sources_skipped_without_teacher_proposals": 1
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  "main_learning_complete": true,
  "model_saved": true,
  "main_learning_reused": false,
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  "answers_collected_before_third_learning": true,
  "completed_main_learning_rounds_before_collection": 2,
  "answer_meaning": "第三轮答卷在第三次学习前收集，反映前两轮学习后的表现；本轮模型已保存。",
  "effect_interpretation": "共同20道种子由上一轮125/160变为120/160，当前尚无稳定原题收益；第三次学习的效果待共同30题测试。",
  "final_common30_test_completed": false,
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    "train-round": 1161.00745
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  "pure_parameter_training_seconds": null,
  "timing_scope": "完整一轮，含出题、作答、学习、保存和阶段切换。",
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