optim.py 文件源码

def _sum_sqnorm(arr):
    sq_sum = collections.defaultdict(float)
    for x in arr:
        with cuda.get_device_from_array(x) as dev:
            x = x.ravel()
            s = x.dot(x)
            sq_sum[int(dev)] += s
    return sum([float(i) for i in six.itervalues(sq_sum)])