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1. Thread Foundation 1.1. Thread status Threads have five states. The process of state transition is shown in the following figure: [external chain picture transfer failed. The source station may have anti-theft chain mechanism. It is recommended to save the picture and upload it directly (img-j67esbgb-1636273815328)( https://images.cnblogs. ...

Welcome to stationmaster School, learning Webmaster Online Zero basics, an online course   Python Complete self-study course is for you today share It's lesson 14<   Python Medium list  >. This class is a big one. I'll explain these knowledge points in detail: Creating and deleting lists,Access list elements,Traversal list ...

1, What is traffic accessibility? The most important consideration of traffic accessibility is traffic cost, that is, traffic distance and traffic time. You can use the path planning service function of API to select the bus route and obtain the traffic time and distance between the two locations. The rule is to initiate a retrieval requ ...

catalogue 1. File opening and closing 2. Document reading and writing 3. Application: file backup script 4. Document positioning 5. Module introduction 6.os module operation file 7.time and datetime modules 8. Module production, release and installation   Reading guide File operation is a very common function. Of course, we also ...

Preface: there are various ways to save data. The simplest way is to directly save it as a text file, such as TXT, JSON, CSV, etc. in addition, Excel is also a popular storage format. Through this article, you will master how to operate Excel through some third-party libraries (xlrd/xlwt/pandas/openpyxl) to store and read data. This article is ...

Python Foundation - Data Types - Dictionaries ** {key:value} ** A set of unordered key-value pairs with mapped relationships Indexing is not possible because it is out of order key is immutable, value can take any data type The key must be unique, but the value does not. Create Dictionary Method 1: Create directly #Create a dictionary d ...

Title Description:   Resolution: This problem is abstracted as finding the number of connected subgraphs of a graph. DFS traversal can be used to calculate the connectivity; Or use and query set. This question uses and looks up the set. (1) Initialization: initialize the parent node of each node as itself. At this time, n nodes hav ...

Creation and common methods of pytorch Tensor Import pytorch package import torch View version number torch.__version__ '1.7.1' 1, Basic creation and types of tensors 1. Tensor creation method Use the pytorch tensor creation function: torch.tensor(): # Create tensor from list t = torch.tensor([1, 2]) t tensor([1,2]) # Creating tenso ...

Tiimmi's learning log 2 Two days of deduction, one question a day 2021.11.3 punch in Today, I spent most of my time studying QQ robot. I don't have time to see many things. I don't do much today. Li Kou daily question 2021.11.3 Connected to rainwater II [difficult] Give you a matrix of m x n, where the values are non negative integers ...

1, ID3 algorithm 1. Ladle import numpy as np import pandas as pd import sklearn.tree as st import math import matplotlib import os import matplotlib.pyplot as plt 2. Read data data = pd.read_csv('C:/Watermelon dataset.csv',header=None) data 3. Coding entropy def calcEntropy(dataSet): mD = len(dataSet) dataLabelList = [x[-1] f ...