2024-05-16 09:15:14 发布
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考虑N=3和D=1的线性回归模型,输入输出对如下:
yl=22,X1=1,y2=3,x2=1,y3=3,x3=2
关于B1(当Bo=0和B1=1时),均方误差(MSE)的梯度是多少?请给出两位小数点后的正确答案
MSE Loss = sum((h - y) ** 2) / 2m Gradient wrt b1 will be sum[(h - y) . x)] / m: hypothesis: h = b0 + b1.x for b0 = 0, b1 = 1: h = x input(x) : [ 1, 1, 2] prediction(h) : [ 1, 1, 2] Ground truth(y) : [ 22, 3, 3] h - y : [-21, -2, -1] (h - y). x : [-21, -2, -2] gradient(b1) : (-21 - 2 - 2) / 3 = -25 / 3 = -8.3333
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