Problem with emission matrix smooth formula in UNQ_C4

In graded assignment UNQ_C4 section instructions about emission matrix smooth formula, it said N denotes “the number of words in the vocabulary”, following the instructions, I could get the correct answer.
But question is, in the course video material, N was set to “number of POS tags”.
which is indeed the correct one for N?

Hi @windsorel

In UNQ_C4 formula the N denotes the number of words in the vocabulary. In UNQ_C3 formula N denotes the number of tags. It could cause some confusion but in the code the variables are named more appropriately.