train_summary.json

{
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  "best_eval_loss": 1.6925994396209716,
  "steps": 17280,
  "tokens_seen": 139501568,
  "active_M": 92.829508,
  "total_M": 246.183748,
  "wall_hours": 0.19512769089804755,
  "planned_tokens": 700000000.0,
  "total_steps": 85449
}