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1. remove non alpha and replace space with '_' VBA insert module: Function CleanCode(Rng As Range) Dim strTemp As String Dim n As Long trim_Rng = Trim 阅读全文
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什么是线性回归? y = f(x), a function that representing the relationship between input x and output y. The Function we used here is the general Linear Functio 阅读全文
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1. Confusion Matrix A confusion table for Class A Positive/ Negative: if target class is A, then the predict A is Positve, Others are negative. True ( 阅读全文
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1. read line from file #!/bin/bash##example: my_read_file.sh input.csv# max_level=0max_line="" #loop read line while read line || [ -n "$line" ]#read 阅读全文
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Feature Selection Why 1.curse of dimensionality Method 1. Filter: Scoring each feature, filter out good features. (Information Content) 1.1 Chi-Square 阅读全文
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介绍 我们有一些历史数据： record id\attributes 根据这些数据，我们想回答： If we got a record 4, that is 'a1,b1,c2', is record4 Good or Bad? 解决方法 我们要分别考量record4的三个属性的先验(Priori) 阅读全文
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1. Syntax http://www.w3school.com.cn/xpath/xpath_syntax.asp Selection 选取根元素 bookstore。 注释：假如路径起始于正斜杠( / )，则此路径始终代表到某元素的绝对路径！ Predicate WildCard 2. 阅读全文
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1. Save output of command as a file, append date /app/etl/DEV/appl/log2/xxx_$(date +"%Y%m%d").log 2. parameters Env 3.output parameters echo $<para> 4 阅读全文
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1. Admin Perm Space: Store Tables Spool Space: Temp table in Executing Temp Space: Global Temp 2.Data Distribution Hash(PI(Primary Index)) -> AMP(virt 阅读全文
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python with data science: https://campus.datacamp.com/courses/intro-to-python-for-data-science/chapter-1-python-basics?ex=1 machine learning coursera: 阅读全文