Lock classification of Java Concurrent tools

1. Introduction, status and role of lock Lock is a tool for controlling access to shared resources; Lock and synchronized, two of the most common locks, can achieve thread safety, but they are different in use and function; Lock is not used to replace synchronized, but to provide advanced functions w ...

Posted on Mon, 09 Mar 2020 23:51:46 -0700 by Skunkmaster

Python source code analysis - object exploration

01 Preface Object is the core concept in Python. In the world of python, everything is an object. Integer, string, even type, integer type, string type are all objects. 02 what is PyObject In Python, everything is an object, and PyObject is the foundation of all objects. It is the core of Python object mechanism. Because it's a base class, and ...

Posted on Mon, 09 Mar 2020 21:54:52 -0700 by $phpNut

PCL point cloud segmentation minimum cut algorithm

It is widely used in background segmentation, stereo vision, matting and so on. GraphCuts graphs have two more vertices on the basis of ordinary graphs, which are represented by the symbols * * S "and" T "*, collectively referred to as terminal vertices. All other vertices must be connect ...

Posted on Mon, 09 Mar 2020 01:56:04 -0700 by dnszero

Introduction to data visualization

Data visualization Library: 1.matplotlib; 2. Seabrown (auxiliary library, more powerful, richer and better looking); 3.Axes3D1. guide pack 1 import numpy as np 2 import pandas as pd 3 4 import matplotlib.pyplot as plt 5 6 import seaborn as sns 7 ​ 8 #Remove the library of alarm prompt during execution 9 import warnings 10 warnings.f ...

Posted on Sun, 08 Mar 2020 06:57:31 -0700 by hasitha

How to use Serverless to add watermark to website pictures gracefully

Many forums and blogs will add watermarks to their images after uploading images, which can prove that this image "belongs to me" or "comes from my blog / website". So what's better to use Serverless technology to add watermark than traditional methods? This paper will share this simple. The traditional method of adding wa ...

Posted on Sun, 08 Mar 2020 06:33:10 -0700 by trial_end_error

Implementation of logistic regression algorithm for binary classification problems

The main content of this paper is to refer to Tang Yudi's machine learning course, according to the understanding of the course learning and the code implementation of imitating the course content. Now there is a data set, which has four-dimensional characteristics and two classifications. It requires m ...

Posted on Sat, 07 Mar 2020 01:38:32 -0800 by ashben

[ROS navigation] Base Local Planner local planning - TrajectoryPlanner source code interpretation-2

Record learning and read the understanding of ROS Navigation source code. This paper is the Base Local Planner local planning source code learning record, mainly including text summary, drawing structure diagram description and code annotation. We are still learning. If you have any mistakes, please c ...

Posted on Fri, 06 Mar 2020 21:25:15 -0800 by Boris Senker

Java collection, array sorting

In the process of normal development, we often encounter the need to sort the elements of arrays and collections according to rules. This paper records the possible situations and related complete code examples in the development process. Knowledge points Compatible < T > interface If the object implements the interface, the compareTo ...

Posted on Fri, 06 Mar 2020 19:50:30 -0800 by oldschool

Introduction to Java - Object Oriented - 01. Inheritance

Original address: http://www.work100.net/training/java-inheritance.htmlMore Tutorials: Beam Cloud - Free Course inherit Sequence Number Intratext chapters video 1 Summary - 2 Inheritance Features - 3 Inheritance keywords - 4 constructor - See the navigation section above for reading 1. Overview Inheritance is a cornerstone of jav ...

Posted on Fri, 06 Mar 2020 19:20:43 -0800 by SCook

Algorithmic Improvement of Primary Scholarship java

Algorithmic Improvement of Primary Scholarships Problem Description~ There are n students in this university. Each of them gets a percentage integer score (0-100) in each of the m required courses. The top k students are selected and awarded scholarships. A student who fails one course (with a score of ...

Posted on Fri, 06 Mar 2020 18:43:11 -0800 by eekeek