多态机制是依靠继承机制实现的。那么，在常规继承机制的基础之上，在基类中使用virtual函数，并在其派生类中对virtual函数进行override，那么多态机制就自然而然地产生了。

Compressive Sensing Resources http://dsp.rice.edu/cs

一些Sparse Representation的代码：http://www.cs.technion.ac.il/~elad/software/

Source Code Collection for Reproducible Research http://www.csee.wvu.edu/~xinl/source.html

Some tutorial for Sparse Coding http://bbs.sjtu.edu.cn/bbscon?board=AI&file=M.1320632364.A

这个总结不错：Paper Survey of Sparse Coding and Related Issues http://www.ee.columbia.edu/~yuxinnan/sc_survey/index.htm

Recognition with Bag-of- Words http://www.cs.ucf.edu/~mtappen/cap5415/lecs/lec17.pdf

当前国际人工智能界普遍公认 Markov 逻辑网是一种较完美地结合一阶谓词逻辑和概率图模型的复杂性和不确定性问题表示和处理方法

数独技巧：http://www.tuilixy.net/thread-9345-1-1.html

CVPR-2010 Tutorial: Sparse Coding and Dictionary Learning for Image Analysis http://www.di.ens.fr/~mairal/tutorial_cvpr2010/ ECCV-2010 Tutorial: Feature Learning for Image Classification http://ufldl.stanford.edu/eccv10-tutorial/

Machine Learning Summer School @Purdue Slides：http://learning.stat.purdue.edu/mlss/mlss/slides

Code for various projects in the Princeton Statistical Learning group http://code.google.com/p/princeton-statistical-learning/downloads/list

http://code.google.com/p/princeton-statistical-learning/downloads/list

Dependent Dirichlet Process based Inference http://code.google.com/p/ddpinfer/

笔试（面试）中的算法程序题 http://blog.csdn.net/ychtt/article/details/6580756