Gradients 。Then Xi Ba (xk-xj) 2AT B= i-k) 2AT %xy (x-x) 2AT f(x)=f月 (+f (xj-xi) 2AT + 2AT 2ATGradients • Then 𝛻𝒙 𝛼 = 𝒙 𝑘 − 𝒙𝑗 ⊥ 2 𝐴 𝑇 𝛻𝒙 𝛽 = 𝒙 𝑖 − 𝒙 𝑘 ⊥ 2 𝐴 𝑇 𝛻𝒙 𝛾 = 𝒙𝑗 − 𝒙 𝑖 ⊥ 2 𝐴 𝑇 => 𝛻𝒙 𝑓 𝒙 = 𝑓𝑖 𝒙 𝑘 − 𝒙𝑗 ⊥ 2 𝐴 𝑇 + 𝑓𝑗 𝒙 𝑖 − 𝒙 𝑘 ⊥ 2 𝐴 𝑇 + 𝑓𝑘 𝒙𝑗 − 𝒙 𝑖 ⊥ 2 𝐴 𝑇 𝑓𝑖 𝑓𝑗 𝑓𝑘 𝒙𝑗 𝒙 𝑘 𝒙 𝑖 𝒙