Is <s> and </s> the same word?

[arvyzukai]

Question in the video

why is the right answer is the one with 1/4. the sentence length including special insertion is 5. should not be log PP(W) = (-1/5)(-113) the right answer vs. log PP(W) = (-1/4)(-113) Given the logarithm of these conditional probabilities: log(P(Mary|))=-2 log(P(|cats))=-1 log(P(likes|Mary)) =-10 log(P(cats|likes))=-100 Assuming our test set is W=“ Mary likes cats ”, what is the model’s perplexity. log PP(W) = (-1/5)*(-113) log PP(W) = (-1/4)*(-113) log PP(W) = -113 log PP(W) = (-1/5…