摘要：import sys import pygame pygame.init() size = width, height = 640,480 screen = pygame.display.set_mode(size) color = (0,0,0) ball = pygame.image.load( 阅读全文

摘要：参考自：https://www.zhihu.com/question/402311979 由 $$ \frac{\pi^4}{90}={\textstyle \sum_{n=1}^{\infty }} \frac{1}{n^4} $$ 得到： $$ \pi =\sqrt[4]{ ({\textsty 阅读全文

摘要：回忆 In [35]: import numpy as np #scipy.special for the sigmoid function expit() import scipy.special 绘制数组 In [36]: import numpy as np import matplotlib 阅读全文