This is an introduction to the Wall Street News Counts.
SVM Introduction
动态规划
很早以前学运筹学的时候学过动态规划。最近看题目的时候看到这个名字，借助zhihu上的一篇文章，重新温习一下。
深度搜索，回溯法和递归
总结了一些网上的资料，比较深度搜索，回溯法和递归，以及怎么用来解决问题。
An interesting random walk question and simulation 03
Modification of the previous question.
pickle error in multiprocssing
Useful links from stackoverflow to solve the errors when pickle for multiprocessing
An interesting random walk question and simulation 02
Got some random walk questions from my friend. We may see lots of similar questions in stochastic process. Here is the question.
An interesting question and simulation 01
An interesting question from my friend. We may see lots of similar questions in stochastic process. Here is one question.
Data Engineering and Modeling 01: predict defaults with imbalanced data
This is an real question with a sample data from internet. We want to predict the defaults from the imbalanced data(default rate is about 0.08%). All the variables are hidden so we need to explore the variables attributes to find some realtion. Also it is imbalanced so we need to apply some sampling methods to balance the data.
Numpy Introduction 03
continue to introduction some basic knowledge of numpy.