![集体智慧编程 - [美] Toby Segaran](https://static.book345.com/covers/s/9787121254437.jpg)
书籍介绍
这本书最独特的地方，在于它把“机器学习”从高冷的数学公式里拉出来，铺展成一个个你能摸到的生活场景：豆瓣式的物品推荐、垃圾邮件过滤、房价与股价预测、约会匹配。它不追求理论的完整严密，而是让你先看到算法“能做什么、用在哪儿”，再回头理解背后的实现。正因如此，它的口碑两极分明：赞它实战清晰、由繁化简的入门书，也有人诟病“代码比数学还难懂、不讲数学就是耍流氓”，认为它更适合缺乏项目经验、想快速上手的人，而对原理与数学推导有要求的读者或许会失望。它适合那种愿意对着示例代码一步步跑、在真实数据集里试错的学习者，而非寻求体系化理论的人。
作者简介
Toby Segaran 是 Genstruct 的软件开发主管，这家公司涉足计算生物领域，他本人的职责是设计算法，并利用数据挖掘技术来辅助了解药品机理。他还为其他几家公司和数个开源项目服务，帮助它们从收集到的数据当中分析并发掘价值。除此以外，他还建立了几个免费的网站应用，包括流行的 tasktoy 和 Lazybase。他非常喜欢滑雪与品酒，其博客地址是 blog.kiwitobes.com，现居于旧金山。
AI导读
核心看点
- 以Python代码实现机器学习算法，侧重实战应用
- 涵盖协同过滤、聚类、搜索排名及优化算法
- 通过Web数据挖掘案例，解析推荐系统原理
读者共识
- 代码清晰直观，是极佳的机器学习入门实战书
- 理论深度有限，不适合追求算法原理深究的读者
- 应用场景贴近生活，有助于理解算法的实际价值
精彩摘录
- "Next, get a list of random people to make up the dataset. Fortunately, Hot or Not provides an API call that returns a list of people with specified criteria. In this exam- ple, the only criteria will be that the people have “meet me” profiles, since only from these profiles can you get other informa"
- "What Does This Have to Do with the Articles Matrix? So far, what you have is a matrix of articles with word counts. The goal is to factorize this matrix, which means finding two smaller matrices that can be multiplied together to reconstruct this one. The two smaller matrices are: The features matri"
- "Another feature that applies more evenly to a couple of companies is this one: Feature 2 (46151801.813632453, 'GOOG') (24298994.720555616, 'YHOO') (10606419.91092159, 'PG') (7711296.6887903402, 'CVX') (4711899.0067871698, 'BIIB') (4423180.7694432881, 'XOM') (3430492.5096612777, 'DNA') (2882726.88776"
- "Because new connections are only created when necessary, this method has to return a default value if there are no connections. For links from words to the hidden layer, the default value will be –0.2 so that, by default, extra words will have a slightly negative effect on the activation level of a "
- "Pearson Correlation Score A slightly more sophisticated way to determine the similarity between people’s inter- ests is to use a Pearson correlation coefficient. The correlation coefficient is a mea- sure of how well two sets of data fit on a straight line. The formula for this is more complicated t"
- "Simulated annealing is an optimization method inspired by physics. Annealing is the process of heating up an alloy and then cooling it down slowly. Because the atoms are first made to jump around a lot and then gradually settle into a low energy state, the atoms can find a low energy configuration."
- "The flight scheduling example works because moving a person from the second to the third flight of the day would probably change the overall cost by a smaller amount than moving that person to the eighth flight of the day would. If the flights were in random order, the optimization methods would wor"
- "Squaring the numbers is common practice because it makes large differences count for even more. This means an algorithm that is very close most of the time but far off occasionally will fare worse than an algorithm that is always somewhat close. This is often desired behavior, but there are situatio"
目录
用户评论
感觉比较适合建模的时候看
很棒的代码级机器学习教程，可以马上学以致用。
github 完成作业：https://github.com/wanggang3333/CollectiveIntelligence 虽然是2015年版本，但是已略显陈旧。
对于有经验的人在这本书真的不怎么样，最多三分，这对于只想了解的小白勉强能给四分。书中内容大部分都是传统机器学习内容，但是讲解都是草草带过，一点都没讲透，书中代码还挺多，但我想说代码实在太烂了。这本书不知道怎么得的这么高分，顶多当个入门目录看看。
粗略读完这些古典互联网的典籍，还是觉得不如一门视频公开课好
代码简约清晰，由繁化简，讲清楚了底层算法的原理；和生产生活结合，极大地增强知识点的印象。不失数据挖掘入门的好书
适合缺乏项目经验的同学学习，对理论和原理介绍的比较少。
算是理论与实际结合的过程看得明白了，就是有一些理论不太明白，需要自行查阅相关概念
补标
电子工业出版社的其他书籍查看全部
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