def get_label(audio_config):
    """Returns label corresponding to which features are to be extracted
        e.g:
    audio_config = {'mfcc': True, 'chroma': True, 'contrast': False, 'tonnetz': False, 'mel': False}
    get_label(audio_config): 'mfcc-chroma'
    """
    features = ["mfcc", "chroma", "mel", "contrast", "tonnetz"]
    label = ""
    for feature in features:
        if audio_config[feature]:
            label += f"{feature}-"
    return label.rstrip("-")