Gradient descent algorithm principle introduction

... gradient descent method 1, gradient: In calculus, the partial derivative of the multivariate function parameter is obtained, and the partial derivative of each parameter is written in the form of vector Come out, it is the gradient. The gradient vector is geometrically the fastest where...


[Linux Command] df

... -a/–all Displays all file systems, including virtual file systems. -B<K/M/G>/-B <SIZE Bytes>/–block-size=<SIZE Bytes> Set the unit for displaying the size bytes, -BK is in K. -BM is in M, -BG is in G (rounded up); -B <SIZE bytes>/--block-size=<SIZE bytes>...


55. The jump game

... gives a non-negative integer array, you are initially in the first position of the array. Each element in the array represents the maximum length you can jump at that position. Judge if you can reach the last position. example 1: 输入: [2,3,1,1,4] 输出: true 解释: 从位置 0 到 1 跳 1 步, 然后跳 3 步到达最后...


Git FAQ

... 1: Git submission ignores automatic ignoring files or folders 2: How to resolve failed to push some refs to git 1-1: Reason for error: The main reason for the error is that the README.md file in github is not in the local code directory 1-2: Problem solving: Step: Code merge git pull -...


Frequently Asked Questions about WeChat Domain Name Sealing Technology and WeChat Domain Name Detection Technology

... Technical Guns 10 years of experience, specifically to solve intractable diseases, the big V that others have given me is called daniuchuangke. How long can I prevent? Is it not red forever? How long can a domain name be sealed? Is it permanently blocked? 答: I will say that, it doesn't...


Uboot environment variable

... First of all, we must first understand the role of environment variables in uboot. The role of environment variables in uboot is to change the source code without recompiling, so that we can change the value of the environment variable. Some settings of uboot, such as bootdelay time,...


Python dictionary pseudo-slice implementation

... 文章目录 前言 实现 def dict_slice ( ori_dict , start , end ) : slice_dict = { k : ori_dict [ k ] for k in list ( ori_dict . keys ( ) ) [ start : end ] } return slice_dict a = { "1" : 1 , "2" : 2 , "3" : 3 } print ( dict_slice ( a , 1 , - 1 ) ) >> > { '2' : 2 } ...


CSS positioning position

... CSS positioning position position The meaning of the attribute: The position attribute determines how the element will be positioned By changing top, right, bottom, left (the unit can be a pixel, or a percentage) to achieve the positional change position optional parameter 1.static ,...


Sina Weibo can't log in today's headline solution

... Today, the media is popular. I am also a loyal user of the headline. I used Sina Weibo to log in to the headlines in early 2015, and I never quit after logging in. After that, I bound the mobile phone number A in the middle, but I didn't set the login password. I quit it today, and then...


Using role and handling exception application

... 一, two ways of use: 1. Introducing the class library method of the namespace , or namespace alias; allows the type to be used in the namespace, so It is not necessary to qualify a type of use in the namespace: Copy the code using System.Text; Create an alias for the namespace or type....