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原创 [形象的解释神经网络激活函数的作用是什么？]
查阅资料和学习，大家对神经网络中激活函数的作用主要集中下面这个观点：激活函数是用来加入非线性因素的，解决线性模型所不能解决的问题。下面我分别从这个方面通过例子给出自己的理解~@lee philip@颜沁睿俩位的回答已经非常好了，我举的例子也是来源于他们，在这里加入了自己的思考，更加详细的说了一下~开讲~首先我们有这个需求，就是二分类问题，如我要将
2017-02-18 07:53:56
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原创 为什么梯度反方向是函数值下降最快的方向？
刚接触梯度下降这个概念的时候，是在学习机器学习算法的时候，很多训练算法用的就是梯度下降，然后资料和老师们也说朝着梯度的反方向变动，函数值下降最快，但是究其原因的时候，很多人都表达不清楚。所以我整理出自己的理解，从方向导数这个角度把这个结论证明出来，让我们知其然也知其所以然~下面我一开始不提梯度的概念，完全根据自己的理解进行下文的梳理，一步一步推出梯度的来历：导数导数的几何意
2017-01-22 20:57:18
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原创 [ windows下boost的安装与错误解决]
第一步：先从官网(www.boost.org)下载最新版的BOOST源码,我这里下的是zip的那个第二步:编译源代码(放心.这里是傻瓜式的操作,很容易操作)(1)先把源代码放在G盘,例如 G:\boost_1_63_0(2)在源代码中找到一个批处理bootstrap.bat,运行即可此时会弹出Building Boost.Jam之类,过一会之后,源代码中新增了1个文件bja
2017-02-13 16:34:32
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原创 [Leetcode 452] Minimum Number of Arrows to Burst Balloons
题目描述：There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided input is the start and end coordinates of the horizontal diameter. Since it's horizontal
2017-01-31 09:20:59
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原创 LeetCode 122 Best Time to Buy and Sell Stock II（股票买入卖出的最佳时间 II）
题目描述：Say you have an array for which the ith element is the price of a given stock on day i.Design an algorithm to find the maximum profit. You may complete as many transactions as you like
2017-01-30 07:49:58
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原创 [Leetcode 455] Assign Cookies
题目描述：Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie. Each child i has a greed factor gi, which is the minimum size
2017-01-29 18:16:11
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原创 [Leetcode 100] Same Tree
Given two binary trees, write a function to check if they are equal or not.Two binary trees are considered equal if they are structurally identical and the nodes have the same value.解题思路：题
2017-01-21 13:50:01
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原创 [leetcode 81] Search in Rotated Sorted Array II
题目描述：Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.(i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2).Write a function to determine if a given targe
2017-01-20 21:42:39
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原创 [Leetcode 79] Word Search
题目描述：Given a 2D board and a word, find if the word exists in the grid.The word can be constructed from letters of sequentially adjacent cell, where "adjacent" cells are those horizontally or verti
2017-01-20 21:35:35
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原创 Leetcode 78. Subsets
iven a set of distinct integers, nums, return all possible subsets.Note: The solution set must not contain duplicate subsets.For example,If nums = [1,2,3], a solution is:[ [3], [1]
2017-01-19 21:23:41
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原创 Leetcode 189 Rotate Array
题目描述：Rotate an array of n elements to the right by k steps.For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4].Note:Try to come up as many solu
2017-01-18 15:22:34
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原创 [Leetcode 349]Intersection of Two Arrays
题目描述：Given two arrays, write a function to compute their intersection.Example:Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2].Note:Each element in the result must be uni
2017-01-17 21:08:21
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原创 [Leetcode 283]Move Zeroes
题目描述：Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.For example, given nums = [0, 1, 0, 3, 12], after
2017-01-16 17:26:35
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原创 [Leetcode 485 ]Max Consecutive Ones
题目描述：Given a binary array, find the maximum number of consecutive 1s in this array.Example 1:Input: 1,1,0,1,1,1 Output: 3 Explanation: The first two digits or the last three digits are con
2017-01-16 16:39:45
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原创 VS2015输入参数执行操作步骤
1 当我们如果一个工程需要输入命令的时候，怎么办？下面给出具体流程！找到你要运行的工程，右键得到下面图片然后点属性进入下面界面：然后在配置属性中的调试出现右边的windows调试器，下面有命令参数输入行，到此为止，我们就可以在这个在这个工程下执行带参数的程序了.知乎号：忆臻专栏地址：机器学习算法博客
2017-01-16 16:22:07
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原创 通俗理解神经网络BP传播算法
在学习深度学习相关知识，无疑都是从神经网络开始入手，在神经网络对参数的学习算法bp算法，接触了很多次，每一次查找资料学习，都有着似懂非懂的感觉，这次趁着思路比较清楚，也为了能够让一些像我一样疲于各种查找资料，却依然懵懵懂懂的孩子们理解，参考了梁斌老师的博客BP算法浅谈（Error Back-propagation）（为了验证梁老师的结果和自己是否正确，自己python实现的初始数据和梁老师定义
2017-01-15 13:31:37
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