{
  "checkpoint_id": "ckpt_20260426_015935_19000_22deff1b_9470fbb7",
  "created_at": "2026-04-26T01:59:36.051213",
  "iteration": 19000,
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  "train_loss": 0.0,
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  "model_config": {
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    "n_head": 4,
    "n_embd": 256,
    "vocab_size": 50257,
    "block_size": 1024,
    "dropout": 0.1,
    "bias": true,
    "initial_connections": 0.1,
    "connection_growth_rate": 0.05,
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  "training_config": {
    "learning_rate": 0.0002,
    "batch_size": 2,
    "max_iters": 500,
    "warmup_iters": 5000,
    "lr_decay_iters": 50000,
    "min_lr": 1e-05,
    "weight_decay": 0.1,
    "grad_clip": 1.0,
    "enable_curriculum_learning": true,
    "enable_introspection": true
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  "data_config": {
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    "batch_size": 2,
    "block_size": 1024
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  "metrics": {
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    "connection_ratio": 1.0,
    "tokens_processed": 38912000,
    "training_speed_iters_per_sec": 0.08472006679937863
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  "tags": [
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    "high_quality",
    "nanecho",
    "curriculum",
    "introspection"
  ],
  "parent_checkpoint": null,
  "notes": "Training checkpoint at iteration 19000 (resumed from iteration 18500) | Phase: adaptive_mastery",
  "file_size_mb": 253.3669786453247,
  "quality_score": 2918400.781244918
}