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停课了吗?下载不浪费!|音效版神经网络

停课了吗?下载不浪费!|音效版神经网络
【有趣的备课】
最近,同时忙着几个事,学校在创一个项目,好几位老师们在结题,受局委托指导其他学校两个课题组结题 ......
但是自从有了AI生成网页工具,教学变得更有趣了。周末给张老师的KNN加了节奏音效。想周一的课给学生玩玩。
当然,因为是教的几个班学生不错,本来再深入讲自定义函数的,感觉类在现在算法实现中,尤其是AI生成代码中,是最常见的面向对象的功能封装方法。为此,备课以“自定义函数与类——以神经网络与前向传播为例”。
为此,在我前面做的一个AI的基石——Python的网页基础上,增加了“三种基本结构”的交互体验,让学生再次温故知新。并重点优化了以类模拟神经网络的可视化,加了交互式可调节的神经网络。当然,这个内容以前我讲过,这些是想再深入,让学生深入理解自定义函数的过程特点,引入到类的对象特征,至两者的结合,即class1.f(x)的现代算法的描述。
记得,这个环节刚开始教学的时候,有的老师不得不用国外的网站。现在有了AI生成网页了,不算简单的交互动画,很快就可以潜入成功了。
并且,加个模拟的音效,不同于KNN那样的外部文件,也可以介绍给学生,了解这是一种设计思维。注意,并非主旨是计算思维。
【课例片段】
1.自主温习三种基本结构
2.自定义函数(作业部分)
# 自定义函数:可以复用的代码,表达算法def f(a,b):      #参数    return a*b #返回for i in range(10):   print(f(i,10-i)) # 多次调用函数
3.类(作业部分)
# 类:封闭的对象,属性(数据)、方法(算法)class Person:    def __init__(self,name): #参数       self.name = name       # 属性:类内数据    def say(self):                 # 方法:类内自定义函数        s=self.name+"您好!"        return sPerson1=Person('李宁')#定义类的实例print(Person1.say() )    # 调用类的方法Person2=Person('张宁')print(Person2.say() ) 
4.神经网络
交互声效:
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5.用类构造简单神经网络,实现前向传播算法。(作业:更换样本)
import numpy as npclass SimpleNeuralNet:    def __init__(self, input_size, hidden_size, output_size):        #输入层-隐藏层的权重        self.W1 = np.random.randn(input_size, hidden_size) * 0.1        print("W1:"self.W1)        #隐藏层偏置        self.b1 = np.zeros(hidden_size)        print("b1:"self.b1)        #隐藏层-输出层权重        self.W2 = np.random.randn(hidden_size, output_size) * 0.1        print("W2:"self.W2)        #输出层的偏置        self.b2 = np.zeros(output_size)        print("b2:"self.b2)        print(f"模型初始化各层的神经元数量: {input_size}{hidden_size}{output_size}")    def sigmoid(self, x):#自定义函数,激活函数        return 1 / (1 + np.exp(-x))    def forward(self, x):#自定义函数,前向传播算法        print("输入层输入:", x)        hidden_z = np.dot(x, self.W1) + self.b1      # 加权求和+偏置        print("隐藏层输入:", hidden_z)        hidden = self.sigmoid(hidden_z)              # 激活函数        print("隐藏层输出:", hidden)        output_z = np.dot(hidden, self.W2) + self.b2        print("输出层输入:", output_z)        output = self.sigmoid(output_z)        print("输出层输出:", output)        return outputmodel = SimpleNeuralNet(321)# 初始化模型sample_input = np.array([[0.50.20.9]])# 输入样本,更换输入值实验output = model.forward(sample_input)# 前向传播print("前向传播输出:", output)
5.分享
可惜的是,今天一早来准备机房,调试,但是上课了没人来。电话给级部,说是停课了。我没得到消息,期待与失望的心理反差,可能并非是功利,仅仅是一种失意吧?
但也不想用这本来的课时去继续做学校的项目,还是尽快梳理总结一下这节课的内容,供大家参考。
手机体验链接,请从:阅读原文
注意打开音效开关。
您可以下载本网页,并辰优化后可以再发我分享,后台可联系。
下载方法是可给本号后面发消息:AIPython
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  1. CONNECT:[ UseTime:0.001065s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001661s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000757s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000659s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001382s ]
  6. SELECT * FROM `set` [ RunTime:0.000623s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001507s ]
  8. SELECT * FROM `article` WHERE `id` = 552986 LIMIT 1 [ RunTime:0.001463s ]
  9. UPDATE `article` SET `lasttime` = 1776918996 WHERE `id` = 552986 [ RunTime:0.001775s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000587s ]
  11. SELECT * FROM `article` WHERE `id` < 552986 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001137s ]
  12. SELECT * FROM `article` WHERE `id` > 552986 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001129s ]
  13. SELECT * FROM `article` WHERE `id` < 552986 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001836s ]
  14. SELECT * FROM `article` WHERE `id` < 552986 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002778s ]
  15. SELECT * FROM `article` WHERE `id` < 552986 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002406s ]
0.199452s