Hi @Kashef
If you are getting any error related to code programming, share a screenshot of your error without sharing codes from the grade cell. respective course mentors will guide you.
In case you have doubt related to any course or code, you can ask about it without sharing codes which grades your assignment.
As far as I remember Machine learning specialisation has enough hints given for any learner to understand or debug their error, otherwise you can also use the search option with the similar error you got from the same course, which will take you to similar threads to understand where you might have gone wrong.
You can always refer your course materials again and again. I really didn’t understand what you meant by referring the lab, if this is about referring the ungraded lab you can surely do that too.
Regards
DP