Exercises

Hi Gregor,

I'm afraid in the first exercise notebook there is a slight mix-up with the dimensions of the matrices and vectors involved. In the introductory text of 1.2.2 it says $W \in \mathbb{R}^{m \times n}$ and $b \in \mathbb{R}^{n}$. However, if the input vector is $x \in \mathbb{R}^{n}$ and the output vector is $y \in \mathbb{R}^{m}$, as specified in the code blocks, and following $y = xW + b$, then the weight matrix has the dimension $W \in \mathbb{R}^{n \times m}$ and the bias vector is $b \in \mathbb{R}^{m}$. The same applies to the text in 1.2.4, where $n$ and $m$ have been swapped. 

Please let me know if I am wrong. 

Best regards,

Lasse