Hello @vartika_rawat,
Thank you for the screenshot! It’s very helpful.
The notebook originally looks like this:
So, above the code cell for def compute_cost(.....) it is the description of the exercise. From your screenshot I think you might have moved some code cells. We are not supposed to move any code cell, but I believe you might have done it unintentionally.
I would therefore suggest you to refresh the notebook to its original state by following these instructions. It will ask you to rename your current notebook before the system can get you a new notebook. After you get a new notebook, then you may copy your work back from the current notebook to the new notebook.
Cheers,
Raymond