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Learn big data analysis and machine learning from 0, and simply write down the competition experience. The score is 0.623537, ranking 629 / 5602     1, Competition background Merchants sometimes carry out large-scale promotional activities (such as discounts or cash coupons) on specific dates (such as boxing day sales, "Black Friday& ...

Cost function: quadratic, cross entropy, log likelihood (course: refining numbers into gold) quadratic cost function C = 1 2 n ...

Fourier concept Introduction to Fourier Fourier transform, which means that a function satisfying certain conditions can be expressed as a trigonometric function (sine and / or cosine function) or a linear combination of their integrals. In different research fields, Fourier transform has many different variants, such as Continuous Fourie ...

1. What is a time tuple? The processing time of 9 sets of numbers assembled by many Python functions in one meta: \ \ The above is struct_time tuple. This structure has the following properties: \ 2. Use datetime to get today's date and the date N days before Q: how do I get today's date in Python? How to get the date of the previous ...

Decision tree in sklearn Module: sklearn.tree tree.DecisionTreeClassifierClassification treetree.DecisionTreeRegressorRegression treetree.export_graphvizThe generated decision tree is exported to DOT mode for drawingtree.ExtraTreeClassifierHigh random version classification treetree.ExtraTreeRegressorHigh random version of regression tr ...

1 Introduction 1 origin and development of ant colony algorithm (ACA) In the process of studying the new algorithm, Marco Dorigo and others found that when ant colony is looking for food, they can exchange foraging information by secreting a biological hormone called pheromone, so they can quickly find the target. Therefore, in their doctoral ...

class In the United States, everyone drinks the same Coca Cola, whether it's the president or a tramp. Andy Warhol Define a class Definition: a class is the sum of abstract concepts of a series of behavioral transactions with common characteristics # Small example: define a Coca Cola class and assign a formula variable class CocaCola: ...

Preface First, do binocular calibration to get the internal parameters of the binocular camera, then do ranging. This binocular visual ranging is based on SGBM algorithm. Note: The effect of binocular calibration will affect the accuracy of ranging. We recommend that you do a good job when doing binocular calibration (try to make the error sm ...

Impulse neural network is called the third generation neural network, which has higher biological reliability. SNN has always occupied the core position in the research of brain like science in recent years. When the performance is similar, the chip based on pulse neural network has lower power consumption, better stability and robustness than ...

Question 2 (5 points): Minimax Firstly, it is clear that there are two kinds of nodes in the pattern tree of minimax algorithm: Max node and mini node. Because minimax algorithm is a pessimistic algorithm, that is, we need to find the maximum value in the minimum income we can obtain, so we are the max node and the other is the mini node. In Q ...