Error: local variable 'cost_sum' referenced before assignment

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
1

Hi,
anybody had the same error during the WK2 assigment?
Despite simple code, I struggle to make it run.
It would help me to start fresh with the assigment as well, any chance to reset the whole sheet?
Thanks in advance.

2

To restore the original notebook you can follow the instructions in this post.

3

Be sure you run all of the cells from the top of the notebook every time you open it .

4

Hi both, thanks for hints.
I restored the file by reverting to a checkpoint from Dec 22nd 2022 - this seems to clear all mods. Yet, after running all cells and writing code below, I’m still having the same error:
Any hints please?

Thank you

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5

Problem solved, I did not define all variables.