{
  "dataset": "pendulum_causal_qa",
  "version": "1.0",
  "source_dataset": "https://huggingface.co/datasets/jimchen2/pendulum-cjepa-160f",
  "num_videos": 3000,
  "train_videos": 2400,
  "val_videos": 600,
  "validation_groups": {
    "in_distribution": 2400,
    "val_ood_amplitude": 100,
    "val_ood_near_conservative": 100,
    "val_ood_initial_velocity": 100,
    "val_ood_gravity_length": 100,
    "val_ood_illumination": 100,
    "val_ood_compound": 100
  },
  "num_questions_per_video": 14,
  "num_questions": 42000,
  "videos_generated": false,
  "timeseries_generated": false,
  "question_types": [
    "descriptive",
    "predictive",
    "explanatory",
    "counterfactual"
  ],
  "frames_per_video": 160,
  "fps": 12,
  "duration_s": 13.333333333333334,
  "size_px": [
    196,
    196
  ],
  "substeps_per_frame": 8,
  "integrator": "RK4",
  "ode": "theta_ddot = -(gravity/length)*sin(theta) - damping*theta_dot",
  "train_seed": 42,
  "validation_protocol": "Whole-video, six-stratum OOD holdout. Validation parameters use fixed low-discrepancy schedules independent of --seed; see README and index.csv.",
  "split_unit": "whole video",
  "qa_files": [
    "questions.jsonl",
    "questions.csv"
  ],
  "timing": "CSV row n and decoded MP4 frame n sample time n/fps",
  "audio": false,
  "renderer": "upstream pendulum-cjepa-160f renderer, fixed visual rod length"
}