Course 5 week 3 quiz question 6

Course Q&A Deep Learning Specialization Sequence Models
1

I selected the option alpha_tt’ is equal to the amount of attention y_ should pay to alpha_t’, and was told this should not be selected. But this is literally the definition in the lecture notes?

Also the explanation under the options seems to be offset by 1, i.e., explanation of option 2 seems to be about option 1, and so on. Maybe a bug in how the correct response is coded?

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2

Hey @abelian_group_chen,
As for the feedbacks, I guess there is a bug indeed, which I will report right away. Thanks for pointing it out. However, for the 4th option, please note the difference between \alpha and a. y^{<t>} is supposed to pay attention to a^{<t'>} and not to \alpha^{<t'>}. To be honest, I don’t even recall \alpha^{<t'>} being defined anywhere during the lecture video discussing the attention model, it was always defined as \alpha^{<t, t'>}. I hope this helps.

Regards,
Elemento

3

Thanks. alpha and a look really similar in both the notes and the quiz that I mixed them up.

4

Hi Elemento,

Thanks for the answer. I was quite confused with this question myself.

Does this mean that there is only 1 right answer here since anything that mentions \alpha^{\langle t' \rangle} (the 1st and the last answers) will be automatically disqualified?

I thought that that term was a typo, meant to be a^{\langle t' \rangle} as that term appeared in two answers. If that is the case, then the 4th answer seems correct (see lecture slides 29 and 30).

Thanks.

5

Hey @weeshun,

Yes, you are correct.

No, it’s not a typo.

I have reported this issue. I guess Coursera is undergoing some changes in its infrastructure, and as a result, we are not able to update the quizzes. It will soon be updated in the future revisions with better options and better feedback. I hope this helps.

Regards,
Elemento

6

Hi Elemento,

Thanks for the answer. I hope that Coursera will change \alpha^{\langle t' \rangle} to a^{\langle t' \rangle} in the future since then the question will have a lot more education values.

Thanks!

7

Hey @weeshun,
Perhaps this is a good thing in my opinion. For learners, who are confused between \alpha^{<t'>} and a^{<t'>} after watching the lecture videos could clear out their confusion after solving this quiz question. This helps them develop a stronger grasp on the notation used in the concept of attention, which is undoubtedly, a widely used concept.

Regards,
Elemento