import json
IN_PATH = "tokenizer_training_data_simple.json"
OUT_PATH = "tokenizer_training_data_simple.jsonl"
with open(IN_PATH, "r", encoding="utf-8") as f_in, open(OUT_PATH, "w", encoding="utf-8") as f_out:
    data = json.load(f_in)
    if not isinstance(data, list): raise SystemExit("input must be a JSON list")
    for i, obj in enumerate(data):
        if not isinstance(obj, dict): continue
        obj.setdefault("idx", i)
        f_out.write(json.dumps(obj, ensure_ascii=False) + "\n")