书籍介绍
这本书的真正价值，不在于教你证明算法，而在于让你用几行Python就把推荐系统、聚类、爬虫、垃圾邮件过滤等东西跑起来。多位读者的共同感受是：前几章酣畅淋漓，到了后面却突然「只告诉你怎么做，却不告诉你为什么」——作者用套公式代替了推导。它适合想快速建立领域全局观、又不想被数学劝退的入门者；但如果你期待搞清每个公式背后的原理，或追求代码的严谨精致，可能会失望：有读者指出部分实现略显粗糙、内容随时间过时。因此它更像一张「动手地图」，指引你哪些算法能用、怎么上手，而不是带你理解它们为何有效。读懂这一点，你才知道它到底适合谁。
作者简介
Toby Segaran是Genstruct公司的软件开发主管，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。Toby Segaran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，Toby Segaran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代码实战讲解机器学习算法
- 涵盖推荐系统、聚类、搜索与优化
- 侧重工程应用而非深奥数学推导
读者共识
- 实战性极强，是优秀的入门敲门砖
- 内容简洁务实，适合快速了解领域
- 部分读者认为后期内容晦涩难懂
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
介绍了基本思想，入门极佳
难怪算法工程师们都对此书很不屑嘛～
非常实用的宝典，看了这本书，如果有工具，可以解决大部分问题，只是不懂python，实现部分看不懂啊
真是好实战哇！
为毛叫集体？这个词儿在汉语里就是上世纪那场浩劫，还有对个性人性无情的扼杀，让我心有余悸
出版的时候中文机器学习的书还不多，现在再看觉得简单了
16年买的书，那个时候就已经过时了，今天翻出来看完了，很喜欢这种教学风格，比较工程，但是这也意味着它时效性比较差…
结合python深度学习，继续深入了解用
大一的时候看了本书，但其实当时没太看懂。。，实际上里面的内容是当今互联网公司赚钱的核心逻辑
本科入门挺适合的
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