def get_all_ramdisks(self, ramdisk_ids=None, owners=None):
        params = {}
        if ramdisk_ids:
            self.build_list_params(params, ramdisk_ids, 'ImageId')
        if owners:
            self.build_list_params(params, owners, 'Owner')
        filter = {'image-type' : 'ramdisk'}
        self.build_filter_params(params, filter)
        return self.get_list('DescribeImages', params,
                             [('item', Image)], verb='POST')
<rpn math expression>
dataset/ETHPy150Open darcyliu/storyboard/boto/ec2/connection.py/EC2Connection.get_all_ramdisks--crossover with--dataset/ETHPy150Open ProgVal/Limnoria/plugins/Math/plugin.py/Math.rpn