Tag：formula

Time：2021105
Generate SQL statements through Excel Sometimes the business department directly throws over an excel table for us to insert or update into the database. It’s OK to insert. As long as the fields correspond, they can be inserted, but what about updating? Therefore, we need another operation mode to generate the desired SQL statements from […]

Time：2021919
1、 Basic knowledge summary: Explanation: （1）XRefers to the weight between the input layer or hidden layer and the corresponding layerWThe result of vector sum with its input data;WRefers to the weight of the level; Subscript middleh，orefer tohiddenLayer andoutputData corresponding to layer (2) The third formula is the weight update formula, αRepresents the learning rate […]

Time：2021911
Move the middle line parallel to both sides until it passes through one or several training sample points.We record the hyperplane as（W, b)。definition:1. Training data and labels (x_1, y_1) (x_2, y_2)… (x_n, y_n), whereX_iIs a vector, y_ I = + 1 or – 12. A training set is linearly separable Training set: {(x_i, y_i)}_ {i […]

Time：202194
Right arrow In latex, you can enter the right arrow of the upper and lower text with\Xrightarrow [upper formula] {lower formula}Write it out, as shown in the figure below: x\xrightarrow[a]{b}y left arrow In latex, you can enter the right arrow of the upper and lower text with\Xleftarrow [formula above] {formula below}Write it out, as shown […]

Time：202191
Drconv is proposed in this paper, which combines the idea of local sharing and maintains translation invariance. It contains two key structures. From the experimental results, drconv meets the design expectations and has good performance improvement on multiple tasks Source: Xiaofei’s algorithm Engineering Notes official account Paper: dynamic region aware revolution Thesis address:https://arxiv.org/pdf/2003.12243.pdf Introduction At […]

Time：2021830
This paper proposes circle loss, which can not only deal with intra class optimization and inter class optimization separately, but also adjust the corresponding gradient according to different similarity values. In general, circle loss is more flexible, and the optimization goal is more clear. It has performed well in many experiments. Personally, I think it […]

Time：2021819
preface: Using Bayesian formula, guess the other party’s gender according to the other party’s Chinese name. No more nonsense. Let’s start happily~ development tool Python version:3.6.4 Related modules: Pyqt5 module; And some Python builtin modules. Environment construction Install Python and add it to the environment variable. PIP can install the relevant modules required. Principle introduction […]

Time：2021813
1. What is markdown format Markdown format is a markup language that can be written with an ordinary text editor. Users can simply format and typeset their own text content through simple markup syntax. If you visit GitHub often, you will find that there will be one under most projectsREADME.mdAnd it is written using markdown. […]

Time：2021810
By Rashida nasrin suckyCompile VKSource: towards Data Science Anomaly detection can be handled as a statistical task of outlier analysis. But if we develop a machine learning model, it can be automated as usual and save a lot of time. There are many use cases for exception detection. Credit card fraud detection, fault machine detection […]

Time：2021612
By Rashida nasrin suckyCompile VKSource: medium Neural networks have been developed to simulate the human brain. Although we haven’t done that yet, neural network is very effective in machine learning. It was very popular in the 1980s and 1990s and has become more and more popular recently. The computer is fast enough to run a […]

Time：202152
Interactive segmentation practical knowledge note 2 How to select the loss function is one of the problems that must be considered when training network in deep learning. In recent years, focal loss is very popular in segmentation, but many projects still use basic dice, crossentropy and other basic loss functions, and the effect difference is […]

Time：202151
Next to “weekly canvas animation” — wave motion Circular motion can be divided into two basic formsCircular motionandElliptical motion。Before explaining circular motion, the essential mathematical formula is about to come. So, ladies and gentlemen, please protect your knees. It doesn’t matter if you don’t understand, just understand the principle. Of course, can understand is the […]