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#coding:utf-8
import numpy as np
import matplotlib.pyplot as plt
import math

def f(x):
    return x[0] * x[0] + 50 * x[1] * x[1]

def g(x):
    return np.array([2 * x[0], 100 * x[1]])

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static const std::string base64_chars = 
             "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
             "abcdefghijklmnopqrstuvwxyz"
             "0123456789+/";


static inline bool is_base64(unsigned char c) {
  return (isalnum(c) || (c == '+') || (c == '/'));
}

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#pragma once
#include <vector>
#include <string>
#include <algorithm>
#include <sstream>
#include "dirent.h"

std::string replace_all(const std::string& str, const std::string& from, const std::string& to) {
	std::string result_str = str;
	size_t start_pos = 0;

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std::string local_to_utf8(const std::string& src)
{
#if _WIN32
	int len = MultiByteToWideChar(CP_ACP, 0, src.c_str(), -1, NULL, 0);
	wchar_t* wszUTF16 = new wchar_t[len+1];  
	memset(wszUTF16, 0, len+1);  
	MultiByteToWideChar(CP_ACP, 0, src.c_str(), -1, wszUTF16, len);
	len = WideCharToMultiByte(CP_UTF8, 0, wszUTF16, -1, NULL, 0, NULL, NULL);
	char* szUTF8 = new char[len + 1];
	memset(szUTF8, 0, len + 1);

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static std::ostream& operator<<(std::ostream& os, const std::vector<int>& data)
{
	for (size_t i = 0; i < data.size();i++)
	{
		os << data[i];
		if (i < (int)data.size() - 1)
		{
			os << ", ";
		}
	}

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static int split(std::vector<int>& data, const int beg, const int end)
{
	if (beg >= end || end <= 0)
	{
		return -1;
	}
	int idx = beg;
	const int base = data[end - 1];
	for (int i = beg; i < end; i++)
	{

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#include <chrono>
#include <string>
#include <iostream>

struct profiler
{
    std::string name;
    std::chrono::high_resolution_clock::time_point p;
    profiler(std::string const &n) :
        name(n), p(std::chrono::high_resolution_clock::now()) { }

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批量替换目录中所有文件的字符串

sed -i "s/zhangsan/lisi/g" `grep zhangsan -rl /modules`

-i 表示inplace edit，就地修改文件
-r 表示搜索子目录
-l 表示输出匹配的文件名

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#!/usr/local/bin/python
#coding: utf-8

import os
import sys
import fnmatch
import cv2

def files_in_dir(root, pattern):
    all_files = []

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#coding: utf-8
# from: https://github.com/argman/EAST/blob/ab97939783901b7e22ff55e151964e159d1627b9/icdar.py
import cv2
import numpy as np
import copy

def shrink_poly(poly, r):
    '''
    fit a poly inside the origin poly, maybe bugs here...
    used for generate the score map