Fix: Example (student’s grade)
Fix: Example (student’s grade)

Computation of marginal probability p(l) in student's example was wrong.
There were mixed notions of p(s|i) and p(s|d) in the example, and hence computation of factors, $\tau_2$ and $\tau_3$, were incorrect.
ermongroup/cs228-notes,mhzhu1/cs323-notes,mhzhu1/cs323-notes