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def java_string_hashcode(s):
    h = 0
    for c in s:
        h = (31 * h + ord(c)) & 0xFFFFFFFF
    return ((h + 0x80000000) & 0xFFFFFFFF) - 0x80000000

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def unsign32RightShift(num, sn):
    return (num & (2**32-1)) >> sn

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a_dict = {}

for i in xrange(100):
  for j in xrange(100):
    a_dict.setdefault(i, []).append(j)

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tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

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1.同一台电脑可以有2个git账号（不同网站的）

首先不同网站，当然可以使用同一个邮箱，比如我的github，gitlab，bitbucket的账号都是monkeysuzie[at]gmail.com 这时候不用担心密钥的问题，因为这些网站push pull 认证的唯一性的是邮箱 比如我的windows 上 2个账号一个gitlab 一个github （用的都是id_rsa）

host github
  hostname github.com
  Port 22

host gitlab.zjut.com

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ssh -qTfNn -D 7070 username@remotehost

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def vgg16_symbol():
    data = mx.sym.Variable('data')
    
    # conv1
    conv1_1 = mx.sym.Convolution(data=data, kernel=(3, 3), pad=(1, 1), num_filter=64, name="conv1_1")
    relu1_1 = mx.sym.Activation(data=conv1_1, act_type="relu", name="relu1_1")
    conv1_2 = mx.sym.Convolution(data=relu1_1, kernel=(3, 3), pad=(1, 1), num_filter=64, name="conv1_2")
    relu1_2 = mx.sym.Activation(data=conv1_2, act_type="relu", name="relu1_2")
    pool1   = mx.sym.Pooling(data=relu1_2, kernel=(2, 2), stride=(2, 2), pool_type="max", name="pool1")
    

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from collections import Counter
import numpy

def _bleu_stats(hypothesis, reference):
    yield len(hypothesis)
    yield len(reference)
    for n in xrange(1, 5):
        s_ngrams = Counter([tuple(hypothesis[i:i + n]) for i in xrange(len(hypothesis) + 1 - n)])
        r_ngrams = Counter([tuple(reference[i:i + n]) for i in xrange(len(reference) + 1 - n)])
        yield sum((s_ngrams & r_ngrams).values())

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# pip install progressbar

import progressbar
import time

progress = progressbar.ProgressBar(widgets=[progressbar.Bar('=', '[', ']'), ' ',
                                            progressbar.Percentage(), ' ',
                                            progressbar.ETA()])
for i in progress(range(100)):
    # do something here

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class ToDictMixin(object):
    def to_dict(self):
        return self._traverse_dict(self.__dict__)
    
    def _traverse_dict(self, instance_dict):
        output = {}
        for key, value in instance_dict.items():
            output[key] = self._traverse(key, value)
        return output