With the same condition $($y$=1)$ and the learning rate $1/2,$ what is the updated weight W$21($new$)?$ Write your answer to three decimal places.

Note: Please use the computation graph method. One can calculate the gradients directly using chain rules, but if the computation graph is not used at all, it will not score properly. Try to fill the red boxes in the computation graph. This question does not need coding and the answer can be easily obtained analytically.