Name: Model Training Lab
Author: MySimulator

Model complexity

Polynomial degree: 3 Ridge regularisation (λ): 0.00 Training points: 18 Noise level: 0.25

Error

Train MSE—

Validation MSE—

Push degree up with λ = 0 and watch validation error turn upward while train error keeps falling — classic overfitting. Then raise λ at the same degree to pull the fitted curve back toward smooth, without changing the data at all.

Fit vs. train (blue) & validation (orange) points

Error vs. degree (at current λ)