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import boto3

class Session(boto3.Session):
    def __enter__(self):
        return self
    def __exit__(self, *args):
        del self

with Session() as sess:
    # get names of regions

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# dependencies
import re
import os
import argparse
import torch
from tqdm import tqdm
#import cv2
import numpy as np
import torch.utils.data
import torchnet as tnt

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import torch

if  __name__ == '__main__':
    X = torch.randn(100)
    out_shape = (100,100)
    idxs = torch.randint(high=100, size=out_shape).long()
    assert torch.abs(X[idxs] - X.index_select(0, idxs.view(-1)).view(*out_shape)).max() < 1e-3
    from timeit import timeit
    setup = 'import torch; X = torch.randn(100); out_shape=(100,100); idxs = torch.randint(high=100, size=out_shape).long()'
    print("X[idxs]: ", timeit("_ = X[idxs]", setup=setup, number=100))

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# implementation of https://arxiv.org/abs/1504.04788
import torch
import torch.nn as nn
import torch.nn.functional as F
import xxhash


class HashFunction(object):
    """Hash function as described in the paper, maps a key (i,j) to a natural number
    in {1,...,K_L}"""

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import torch
import torch.nn as nn
import torch.optim as optim
import torch.nn.functional as F

import numpy as np
from scipy import optimize

from obj import PyTorchObjective

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import torch
from functools import reduce
import math

def is_power(n):
    # https://stackoverflow.com/a/29480710/6937913
    n = n/2
    if n == 2:
        return True
    elif n > 2:

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import random
from io import StringIO

def write_bitstream(fname, bits):
    # bits are a string of ones and zeros, based on this
    # stackoverflow answer: https://stackoverflow.com/a/16888829/6938913
    # was broken due to utf-8 encoding using up to 4 bytes: https://stackoverflow.com/a/33349765/6937913
    sio = StringIO(bits)
    with open(fname, 'wb') as f:
        while 1: