Programmer Think

preface With the rapid development of wechat, communication in work and life also depends more on it. However, due to the formality and standardization of e-mail, it is still irreplaceable. However, whether it is the internal work mailbox or personal mailbox of the enterprise, it always receives all kinds of spam, including merchants' advertis ...

[Kaggle] Telco Customer Churn Telecom user churn prediction case Part III introduction    in the second part of the case, we introduce in detail the common feature transformation methods, some of which are necessary for model training, such as natural number coding and unique heat coding, while some methods focus on improvin ...

support vector machine In the case of linear separability, the data point closest to the separation hyperplane in the sample points of the training data set is called support vector. The cost function and logistic regression are similar: Also known as large interval classifier, it can find the best linear classification position: The phys ...

1, Introduction to the characteristic principle of ROPS (rotational projection statistics)   in this article, we continue to learn how to use the PCL:: ropestimate class to extract the features of points. The feature extraction method implemented in this class is written by Yulan Guo, ferdous sohel, Mohammed bennamon, min Lu and Jianwei w ...

GBDT gradient lifting iterative decision tree It is an integrated model. The base classifier adopts CART regression tree. GBDT is an algorithm to classify or regress data by using additive model and continuously reducing the residual generated in the training process. Intuitive understanding: there is a residual between each round of predictio ...

In the last article, we said that single-layer perceptron realizes simple logic circuit and multi-layer perceptron realizes XOR gate circuit. Threshold is introduced θ， Offset b. Now, according to the expression in the previous article, the reality activation function. The expression of our previous perceptron is as follows: y = { x1w1 ...

matplotlib Drawing function plot plot: draw a two-dimensional graph to connect the points of the plane import numpy as np import matplotlib.pyplot as plt x = np.linspace(-np.pi, np.pi, 256,endpoint=True) plt.plot(x,np.cos(x)) # x-axis y-axis plt.show() # Finally, enter this # If the x-axis is not specified, it will be 0,1,2 n-1 scatter ...

1, Reptile preparation 1.1 climbing target The target of the public comment Web crawler is the comment data of the store. The example is shown in the figure below. 1.2 web page analysis First log in, search for bubble water by keyword, and click a store at will to view all the evaluation interfaces, as shown in the figure below. First ...

Practice the fashion MNIST dataset Like the theoretical knowledge of Chpater3 in the book (hands on machine learning with scikit learning), it can be read together, but the MNIST data set of Chapter 3 in the book cannot be imported at all import torch import torchvision from torch.utils import data from torchvision import transforms from d2l ...

The space here may be too long. Carry out the water alone. The tutorial video is only eight minutes long. I just looked at my ideas, and then I wrote it for two hours. I kept fixing mistakes, and finally came up with a result similar to the result in the video. Problem description According to the first-order equation of last class: y=1.477x+ ...