repro/metrics.json

{
  "metric_name": "cer",
  "definition": "sum(edit_distance(pred_norm, ref_norm)) / sum(max(1, len(ref_norm)))",
  "aggregation": "global sums (DDP all_reduce)",
  "empty_reference_policy": "references with empty normalized text are excluded from valid_n and counted in empty_ref_count"
}