Tag：algorithm
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Time：2020-7-11
This blog mainly introduces what JWT is and how to use JWT (JSON web token) in spring boot project. 1. About JWT 1.1 what is JWT At the beginning of the old saying, if we want to use such a tool, we must first know the following questions. What is this tool and what problems […]
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Time：2020-7-11
Spark introductory learning resources: Spark introduction series of experimental courses. 1、 About spark: Spark is a cluster computing framework developed by UC Berkeley amp lab, which is similar to Hadoop, but has many differences. The biggest optimization is that the intermediate results of computing tasks can be stored in memory, and it does not need […]
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Time：2020-7-10
Guide: with the rise of AI, more and more intelligent products are born, and the algorithm link will become more and more complex. In engineering practice, a large number of algorithm models are rapidly constructed from 0 to 1 and continuous iterative optimization. This paper will introduce how to break through the closed loop of […]
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Time：2020-7-9
Grape Command syntax Command meaning: deserialize the given serialization value and associate it with the given key. Command format: RESTORE key ttl serialized-value [REPLACE] [ABSTTL] [IDLETIME seconds] [FREQ frequency] Command actual combat redis> DEL mykey 0 redis> RESTORE mykey 0 “\n\x17\x17\x00\x00\x00\x12\x00\x00\x00\x03\x00\ x00\xc0\x01\x00\x04\xc0\x02\x00\x04\xc0\x03\x00\ xff\x04\x00u#<\xc0;.\xe9\xdd” OK redis> TYPE mykey list redis> LRANGE mykey 0 -1 1) “1” […]
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Time：2020-7-9
Algorithm idea Compare the first number, if it is odd, judge the second number; if the second number is even, judge the penultimate number is even, then judge the penultimate number is odd, then complete the exchange, and reduce the value judged next time. The efficiency of the algorithm is n package com.itheima.kuihuabaodian; import java.util.Scanner; […]
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Time：2020-7-9
The measurement method of algorithm efficiency is as follows 1. After the event statistical method: through the designed test program and data, using the computer timer to compare the running time of the programs compiled by different algorithms, so as to determine the efficiency of the algorithm. Defect: it is based on and prepared a […]
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Time：2020-7-8
JVM garbage collection Write it at the front Common interview questions in this section The answers to the questions are mentioned in the article How to judge whether the object is dead (two methods). Briefly introduce strong reference, soft reference, weak reference and virtual reference (the difference between virtual reference and soft reference and weak […]
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Time：2020-7-8
In view of the wide and diverse application scenarios of machine learning that is emerging, the basic algorithm team of Alibaba computing platform started to develop a new generation of machine learning algorithm platform based on Flink in 2017. The name of the project is “alink”, which is taken from the public part of the […]
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Time：2020-7-8
Ask a question: given a string, please find out the length of the longest substring without repeating characters. Example: “abbcc” — > “ab” or “BC”, “abcadef” — > “ADEF” Solution: using brute force algorithm is easy to implement, but the time complexity is O (n ^ 2). This problem can be completed through a traversal, […]
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Time：2020-7-7
Data structure and algorithm play an important role in computer science. This series of articles try to use golang programming language to implement various data structures and algorithms, and analyze the algorithms appropriately. We’ll take a brief look at golang, and then we’ll enter the first door of the computer programming world. Getting started golang […]
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Time：2020-7-6
The article was created in April 2020, about 7000 words. It is estimated that the reading time is 18 minutes. Please sit down and relax. 0 – Foreword Note: by default, traditional algorithms are the basic skills of all engineers, so the algorithms mentioned later mainly refer to machine learning and deep learning. Although the […]
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Time：2020-7-6
Ecological development trend of artificial intelligence Hello, I’m Lin Wei. The theme of my speech today is “Ai breaks through infinite possibilities – cloud double 11 for 500 million consumers”. I come from systems, but in some recent meetings, I found that more and more people with system background began to study AI. In the […]
