def combine(pmaps):
    """
    :param pmaps: a set of homogenous ProbabilityMaps
    :returns: the combined map
    """
    shape = get_shape(pmaps)
    res = ProbabilityMap(shape[1], shape[2])
    for pmap in pmaps:
        res |= pmap
    return res
:param pmaps: a set of homogenous ProbabilityMaps
    :returns: the combined map