num_inputs=2 # set example number num_examples=1000 # set true weight and bias in order to generate corresponded label true_w=[2,-3.4] true_b=4.2 features=torch.randn(num_examples, num_inputs, dtype=torch.float3
X,Y = np.meshgrid(x,y)# 把x,y数据生成mesh网格状的数据,因为等高线的显示是在网格的基础上添加上高度值foriinrange(len(x)):# 初始化所有的代价函数forjinrange(len(y)): b = x[i] w = y[j] Z[j][i] =0forninrange(len(x_data)): Z[j][i] = Z[j][i]+ (y_data[n]-b-w*x...
2. 概率解释(Probabilistic interpretation) 3. 局部加权线性回归(Locally weighted linear regression) 回顾: 上一节讲解了梯度下降法,就是通过不断的迭代,找到成本函数J的最小值。其中又讲到了随机梯度下降法和批量梯度下降法,其区别在于是否每一次迭代都要遍历所有的数据。
2. 线性回归(Linear Regression) 2.1 引例 为了进一步的讲解,现在将之前的例子复杂化一点,添加一个新的特征,房间的数量,从而得到了一个二维输入量的表格: 对于二维输入量来说,我们用符号表示就是$x\in \Reals^2 $,同时为x^{(i)}添加一个下标 j 来表示特征号,住房面积为1,房间数量为2。那么就有x^{(i...
Step-by-step example of using Apache Spark MLlib to do linear regression illustrating some more advanced concepts of using Spark and Cassandra together.
这节课开始介绍一些常见算法,这次Lecture介绍了最常见的Linear Regression线性回归算法。 Linear Regression Problem 在Linear Regression模型下的hypothesis为,特征集为d维,加上常数项后就为d + 1维(所以注意i从0开始)。在线性回归中,误差的衡量常采用平方误差(squared error):,相关的记号已经在上一节课解释过啦.....
Linear Regression is a powerful yet simple technique for analyzing relationships and making predictions. While it has limitations, its efficiency and interpretability make it a key tool in data science. If you want to master Linear Regression and other ML techniques, then you should join ourData ...
In the most basic case, linear regression tries to predict the value of one variable, called thedependent variable, given another variable, called theindependent variable. For example, if an organization was trying to predict sales rate based on advertising spend, sales would be the dependent vari...
This Model predicts prices using a linear regression function:4060801001201401606810121416 trace 0trace 1House Prices vs. SizeSquare MetersPrice in MillionsExample const xArray = [50,60,70,80,90,100,110,120,130,140,150]; const yArray = [7,8,8,9,9,9,10,11,14,14,15]; // Calculate ...
数据挖掘_R_Python_ML(2): Linear Regression vs SVR 在上一篇“数据挖掘: R, Python,Machine Learning,一起学起来!”中,我们介绍了用R进行线性回归的例子。 这次我们来看看,同样一份简单的无噪声数据,用线性模型和支持向量模型分别进行回归,得出的结果是否一致。