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Preface Previously, I have talked about the path of python machine learning. This time, Luo Luopan takes you to complete a machine learning project of Chinese text sentiment analysis. Today's process is as follows: Data Situation and Processing Data situation The data here are for the comments of the public (provided ...

Shell Initial (2) Shell Operator Shell basic operator Shell, like other programming languages, supports a variety of operators, including: Arithmetic operator Relational operator Boolean operator String operator Native bash does not support simple mathematical operations, but can be implemented by other commands, such as awk and expr, e ...

API overview What is API? API (Application Programming lnterface), application programming interface. The so-called API is the value of many classes, many methods, JDK gives us a lot of ready-made classes, we can use them directly, these classes are API. API Official Documentation The Use of Scanner Classes in Several Common API s Guide bag B ...

Three Questions in Life What is an object The real thing with certain characteristics and behaviors is the object, everything is the object. What is a class A combination of a series of objects with the same characteristics and behavior is called a class.In programming, only classes can have objects. 1. What is Object OrientedObject- ...

Reprinted from: https://blog.csdn.net/chanmufeng/article/details/82955730 0-1 knapsack problem The 0-1 knapsack problem is that each item can only be used once. Recursive Method public class KnapSack01 { /** * Recursive Function for Solving Knapsack Problem * * @param w Weight Array of Items * ...

This week's lessons are: exceptions, collections, IO streams, multithreading. abnormal 1. I personally understand that exceptions are abnormal events that occur in the process of running a program, which will end the running program.2.Java exception handling: Java has the ability to handle exceptions. Java has five keywords to handle exceptions ...

The most memory-intensive object creation process must be constrained. As a Singleton, it always maintains that there is only one instance in the application, which can significantly improve the performance of the program. The following four implementations of singleton are discussed. The stability of Singleton under single thread is excellent ...

Java concurrent programming: two ways of interthread collaboration: wait, notify, notify All and Condition We've talked a lot about synchronization in the past, but in reality, collaboration between threads is needed. For example, the most classic producer-consumer model: when the queue is full, the producer needs to wait ...

1, stack 1.1. What is a stack The structure of the stack is similar to that of the cartridge clip of a gun. The first bullet placed in the cartridge clip is the last one to be hit, while the last bullet placed in the cartridge clip is the first one to be hit, which is called the data structure of "first-in-last-out" ...

1. Some Usages of Decorators and Functions from functools import wraps def wrapper(func): @wraps(func) def inner(): func() return inner @wrapper def func1(): '''jisfhsdkfkd''' print('ddf') print(func1.__name__) func1() print(func1.__doc__) # def index(): # '''This is a homepage information.''' # print('from ...