def list_metrics_to_list_bac(list_metrics):
    """
    Arg:
        list_metrics: A list of dictionaries. 
    Return:
        list_bacs: A list of floats with the same length as list_metric's.
    """
    list_bacs = [None]*len(list_metrics)
    for iter_idx, iter_dict in enumerate(list_metrics):
        bac = iter_dict["BAC"][0]
        list_bacs[iter_idx] = bac

    return list_bacs