K Means, Kernel Trick, Clustering, Unsupervised Clustering, Data Science.
then take the dot product f(xᵢ) * f(xᵢ)= [1, 2, 3, 2, 4, 6, 3, 6, 9] [1, 2, 3, 2, 4, 6, 3, 6, 9]ᵀ =1 + 4 + 9 + 4 + 16 + 36 + 9 + 36 + 81 = 196 ▹ Option 2: apply the kernel trick on x in the lower dimension The kernel function for projecting to f(x) vector space is K(x, y) = f(x) * f(y) = (xᵀy)²,