def METHOD_NAME():
    scenarios = load_light_scenarios_from_jsonl(self.scenario_data_path)
    stats_key_counts: DefaultDict[DataOverlapStatsKey, int] = defaultdict(int)
    ngram_index = create_ngram_index(
        light_scenarios=scenarios,
        n_values=self.n_values,
        tokenizer=self.tokenizer,
        stats_key_counts=stats_key_counts,
    )
    return OverlapObjects(ngram_index=ngram_index, stats_key_counts=stats_key_counts)