Lab 1: Assignment 4 fix

lab1/lab-notes.md

@@ -166,4 +166,4 @@ Confusion matrix o misclassification error e framtana.
 
     $$J(\theta) = \frac{1}{n} \sum_{i=1}^{n} \left( \hat{y}(\mathbf{x_i;\theta}) - y_i \right)^2 = \frac{1}{n} \| \mathbf{\hat{y} - y} \|^2_2 = \frac{1}{n} \| \mathbf{X \theta - y} \|^2_2 = \frac{1}{n} \| \mathbf{\epsilon} \|^2_2$$
 
-    where $\| \cdot \|_2$ denotes the usual Euclidean vector norm and $\| \cdot \|^2_2$ its square.
+    where $\| \cdot \|_2$ denotes the usual Euclidean vector norm and $\| \cdot \|^2_2$ its square. [p. 41]