def cal_normalized_mel(mel, dataset_name, cfg):
    """
    mel: (n_mels, T)
    """
    # mel_min, mel_max: (n_mels)
    mel_min, mel_max = load_mel_extrema(cfg, dataset_name)
    mel_norm = normalize_mel_channel(mel, mel_min, mel_max)
    return mel_norm
mel: (n_mels, T)
processors/acoustic_extractor.py