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# coding=utf-8

import pandas as pd
import itertools
import time
import multiprocessing
from typing import Callable, Tuple, Union

def groupby_parallel(groupby_df: pd.core.groupby.DataFrameGroupBy,
                     func: Callable[[Tuple[str, pd.DataFrame]], Union[pd.DataFrame, pd.Series]],

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import math

from mxnet import init
from mxnet.gluon import nn
from mxnet.gluon.model_zoo.custom_layers import HybridConcurrent, Identity


def sigma(kernel_size, channels):
    return math.sqrt(2. / (kernel_size * kernel_size * channels))

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# encoding: utf-8
# http://weibo.com/1915548291/CqcYV0Ga3
# 1到n个人排成一圈，从编号为1的人开始，依次说白，黑，白，黑，。。。，说到黑的人离队，问最后留下编号为几的人。


def who_is_the_lucky_dog(n):
    if n < 1:
        return 'n must be greater than 0'
    elif n == 1:
        return 1