过拟合&欠拟合
主讲人：龙良曲
Scenario1: house price
Scenario2: GPA
The ground-truth distribution?
▪ That’s perfect if known
▪ However
Another factor: noise
▪ 𝑦 = 𝑤 ∗ 𝑥 + 𝑏 + 𝜖
▪ 𝜖 ∽ 𝑁(0.01, 1)
▪ 1.567 = w * 1 + b + eps
▪ 3.043 = w * 2 + b + eps
▪ 4.519 = w * 3 + b + eps
▪ …
𝑙𝑜𝑠𝑠 = 𝑊𝑋 + 𝑏 − 𝑦
2
