distance.py 文件源码

def hamming(a,b):
    if a.dtype == np.bool and b.dtype == bool:
        return (a ^ b).sum()
    elif a.dtype == np.ubyte and b.dtype == np.ubyte:
        return hamming_table[a^b].sum()
    else:
        raise NotImplementedError("Unsupported array types %s and %s",a.dtype,b.dtype)