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LeetCode136——Single Number
Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without using e...
分类:其他好文   时间:2015-02-27 11:58:37    阅读次数:169
LeetCode137——Single Number II
Given an array of integers, every element appears three times except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without u...
分类:其他好文   时间:2015-02-26 18:33:18    阅读次数:99
CSS currentColor 变量的使用
与CSS动画结合当与CSSanimation结合,可以得到更加有创意的效果,比如这个来自codepen的示例CSShtml { color: red; animation: color 30s linear infinite;}@keyframes color { 33.3% { color:...
分类:Web程序   时间:2015-02-26 14:51:12    阅读次数:220
1012. The Best Rank (25)
To evaluate the performance of our first year CS majored students, we consider their grades of three courses only: C - C Programming Language, M - Mathematics (Calculus or Linear Algrbra), and E - Eng...
分类:其他好文   时间:2015-02-25 21:10:23    阅读次数:157
使用R进行分类时,ROC的绘制和AUC的计算
在之前的这篇日志中,我简单介绍了使用R进行Logistic Regression时,Recall,Precision,TPR,FPR等等的计算,但是如果依照这种方法绘制ROC曲线(关于ROC和AUC的概念,网上有很多介绍,例如:http://beader.me/2013/12/15/auc-roc/ )就太过于麻烦了,需要手动调整分类阈值。其实R也提供了最基本的ROC曲线绘制的工具包(Pack...
分类:其他好文   时间:2015-02-23 12:01:29    阅读次数:269
Machine Learning - VI. Logistic Regression (Week 3)
机器学习Machine Learning - Andrew NG courses学习笔记 Classification  0、1表示含义 denote with 0 is the negative class denote with 1 is the positive class.  Hypothesis Representation  Decisi...
分类:系统相关   时间:2015-02-19 23:00:48    阅读次数:350
DX & OpenGL 's depth
Some math I did ... (not 100% verified, but looks like it works) n = near f = far z = depth buffer Z-value EZ = eye Z value LZ = depth buffer Z-value remapped to a linear [0..1] range (near plane t...
分类:其他好文   时间:2015-02-16 11:47:34    阅读次数:195
快速用低度下降法实现一个Logistic Regression 分类器
logistic regression , 梯度下降法
分类:其他好文   时间:2015-02-14 18:48:35    阅读次数:216
线性代数复习
线性方程组 linear equations形如a1x1+a2x2+a3x3+....+anxn=b的方程是线性方程,其中a1到an通常是已知数。线性方程组是由一个或几个包含相同变量的x1..x2..xn的线性方程组成的。线性方程组的一组解是一组数(s1..s2..sn),解得集合称之为解集。具有相...
分类:其他好文   时间:2015-02-09 12:41:00    阅读次数:212
More 3D Graphics (rgl) for Classification with Local Logistic Regression and Kernel Density Estimates (from The Elements of Statistical Learning)(转)
This post builds on aprevious post, but can be read and understood independently.As part of my course on statistical learning, we created 3D graphics ...
分类:其他好文   时间:2015-02-09 10:43:24    阅读次数:245
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