English

Phonetic Symbol Generator

为了辅助英语口语练习，花了一天时间捣鼓了段代码自动生成所给文章的音标和三线。本文简单讲述了实现的过程。用到了网页爬虫，python，JavaScript的知识。为了练习英文写作能力，后续内容用英语书写。

In order to make practicing oral English easier, I develope the Phonetic Symbol Genereator. This article discribe the process of how I develop the Phonetic Symbol Generator which you can download HERE.

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Machine Learning

Summary of Machine Learning

单变量线性回归

Model Representation

cost fuction

$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}$$

$$
J \left( \theta_0, \theta_1 \right) = \frac{1} {2m}\sum_{k=1}^m{ \left( h_\theta \left( x^ \left( i \right) \right) - y^\left( i \right) \right)^2}
$$

Gradient Descent

Repeat until convergence {

$$
\theta_j := \theta_j - \alpha \frac{\partial}{\partial \theta_j} J \left( \theta_0, \theta_1 \right) (for\ j = 0 \ and \ j = 1)
$$
}

Linear Regression With Single Variables

Repeat {

$$
\theta_0 := \theta_0 - \alpha \frac{1}{m} \sum_{i=1}^m {\left(h_\theta \left( x ^ \left( i \right) \right) - y^\left( i \right) \right)}
$$

$$
\theta_0 := \theta_0 - \alpha \frac{1}{m} \sum_{i=1}^m {\left(h_\theta \left( x ^ \left( i \right) \right) - y^\left( i \right) \cdot x^\left( i \right) \right)}
$$
}

Project

summary-of-project

心得体会

  我做每一件事都尽量做到最好，但是国创这各项目上真的力不从心，从一开始的成员变动，到后来每个队员都有更重要的事情去做，包括我自己也一样（因为数模比赛和出国的准备耽搁了好多），以至于到中期答辩我们还几乎没有进度。国创一年的时间很快就过去了，虽然断断续续地去完成国创项目，但是我最终还是学到了一些新的知识。

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