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Concept: To explore the correlation between one set of variables and another (Canonical Correlation Analysis) is an extension of simple correlation and multivariate correlation Compress parameters into a variable Parameter limit: standardize the transformation so that the covariance is 1 Lagrange expansion Seeking the extreme value ...

Method Reference When using Lambda expressions, the code we actually pass in is a solution: what parameters to do with.Consider a case where, if the same scenario already exists for the scenario we specified in Lambda, is it necessary to rewrite the duplicate logic? Redundant Lambda Scenes Let's look at a simple functional interface to appl ...

Friday is not sleepy. I wrote a Python script with simple functions: get Sina's epidemic data about each country, write it into md file and preview it, get the data regularly, and generate new markdown content at the end of the file if there is new data. 1, Code Because the function and code are very simple, go directly to the code # -*-codin ...

I have been in JAVA pit for more than July, and I also try to build a framework by myself. Recently, I am fascinated by this aspect of spring aop, so I record my current small demo, and I will continue to improve my demo later. I hope that the great gods will not be stingy to teach me. It mainly uses reflection and java's own proxy class. Theor ...

Introduction Java 8 (also known as jdk 1.8) is a major version of Java language development. There are many new features in java8. This article focuses on Lambda expressions. Lambda expressions, also known as closures, are the most important new feature driving the java 8 release. Lambda allows functions to be passed as parameters to a method. ...

1. To judge whether each letter in a string is in another string, we can use the characteristics of the set to solve the problem. If the elements of the set exist, it is impossible to add the update to the set again. Then the length of the set is the same as before. If you add it, the length of the set will increase >>> a = 'ghost' ...

I'm ashamed that JAVA 8 has been released for 7 years, and I have been exposed to JAVA for more than 2 years. JDK14 has been released, and I'm still learning new features of JAVA 8, facing the wall for 3 minutes. In the afternoon, I took the time to learn some common built-in interfaces and Stream intermediate operations of Java 8, and took not ...

python data analysis personal study reading notes - Catalog Index Chapter 4 statistics and linear algebra Statistics and linear algebra lay the foundation for exploratory data analysis. Both descriptive and inferential statistical methods are helpful to obtain insights and inferences from the original data. For example, after calculating the ...

python calls itself "Batteries included" because it provides many built-in modules that can be used without installation and configuration This chapter mainly introduces some common built-in core modules of python Common core modules of Python 1, collections module This is a useful container module, which provides many useful collecti ...

Preface In the previous article, I briefly introduced Linq's entry-level usage. This article tries to explain some more in-depth usage methods. Unlike the previous article, I will first introduce the support methods in Linq, and then write them in the form of method chain and SQL like, guided by the actual requirements. Introduction to pre conc ...