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Posted by Marty Cagan on August 28, 2007 Tags: product management, product marketing, program management, product discovery Industry pundits claim that 9 out of 10 product releases are failures in that they don’t meet their goals.  I don’t know if th…
先简单说一下Hadamard product:  (参照维基百科:https://en.wikipedia.org/wiki/Hadamard_product_(matrices)) 而matrix product为:  (参照维基百科:matrix product) 这两者是完全不一样的,但为什么python都是用∗∗表示呢?通过查阅官方文档(PEP465),我们可以得到如下解释: For numpy.ndarray objects, * performs elementwise multip…
https://stackoverflow.com/questions/695752/how-to-design-a-product-table-for-many-kinds-of-product-where-each-product-has-m You have at least these five options for modeling the type hierarchy you describe: Single Table Inheritance: one table for all…
For detail technical introduction about relationship, please refer to this wiki. The relationship transaction data is maintained in assignment block below: The data could be read from function module below: Result stored in this component: It contain…
作为微软的MVP,有一个我最喜欢的好处,就是可以与产品组(产品研发部门)有零距离接触,可以最先拿到即将发版的产品,并且和产品组沟通,对产品中出现的问题实时反馈. 看到TFS产品组吸收了自己的建议和反馈,在发布版本中更新了自己的反馈,对这个产品更加喜欢了. 之前产品组推出TFS的RC版本,一般都只有英文版,没有中文版的.但是往往由于语言的原因,其中隐藏着许多的问题,例如工作项模板,中文和英文的差异较大. 自从我和一个日本的MVP提出要求后,产品组在后续发布RC版本,都提供了中文和英文版.TFS 2…
微软近期Open的职位: Senior Product Manager My Life & Work Beijing China Our passion is to enable people to thrive in this mobile-first and cloud-first world. Do you see how antiquated our surrounding is when the virtual world has already become more advance…
1.1 安装 pip install flashtext 1.2 使用例子 1.2.1 关键字提取 >>> from flashtext import KeywordProcessor >>> keyword_processor = KeywordProcessor() >>> # keyword_processor.add_keyword(<unclean name>, <standardised name>) >>…
Flashtext:大规模数据清洗的利器 在这篇文章中,我们将介绍一种新的关键字搜索和替换的算法:Flashtext 算法.Flashtext 算法是一个高效的字符搜索和替换算法.该算法的时间复杂度不依赖于搜索或替换的字符的数量.比如,对于一个文档有 N 个字符,和一个有 M 个词的关键词库,那么时间复杂度就是 O(N) .这个算法比我们一般的正则匹配法快很多,因为正则匹配的时间复杂度是 O(M * N).这个算法和 Aho Corasick 算法也有一点不同,因为它不匹配子字符串. Flash…
delphi  2016 路线图 http://community.embarcadero.com/article/news/16211-embarcadero-rad-studio-2016-product-approach-and-roadmap-2 Embarcadero RAD Studio 2016 Product Approach and Roadmap Linux Support Written by Marco Cantu, RAD PM. Posted in News As w…
the inner product Givens two vectors \(x,y\in \mathbb{R}^n\), the quantity \(x^\top y\), sometimes called the inner product or dot product of the vectors, is a real number given by: \[x^\top y=\begin{bmatrix}x_1 , x_2 ,\cdots ,x_n \end{bmatrix}\begin…