def METHOD_NAME(sensitivities):
    """Merge sensitivities.
    Args:
      sensitivities(list<dict> | list<str>): The sensitivities to be merged. It cann be a list of sensitivities files or dict.
    Returns:
      dict: A dict stroring sensitivities.
    """
    assert len(sensitivities) > 0
    if not isinstance(sensitivities[0], dict):
        sensitivities = [load_sensitivities(sen) for sen in sensitivities]
    new_sensitivities = {}
    for sen in sensitivities:
        for param, losses in sen.items():
            if param not in new_sensitivities:
                new_sensitivities[param] = {}
            for percent, loss in losses.items():
                new_sensitivities[param][percent] = loss
    return new_sensitivities