A Timeout error probably means a cells is taken more time than usual and causing kernel crash.
This can happen either if there is an error in your codes, or editing/adding of any extra code outside of ###START AND END CODE HERE### or deletion of any important code cell which you were not suppose to remove.
Also check if you any typo in your codes.
Another information your error is telling the directory was not found, so make sure your data parse part codes are recalled correctly.
Can I know if your model training was successful?
your preprocess part of the assignment only looks having error, so re-read the instructions if you followed through properly.
if you are confident of your codes being correct, another way to resolve this issue would be to save a copy of the assignment you did in your system and then re-do the assignment while mentioning only codes between ###STart And END CODE HERE### without adding any extra code line other than already given as per instructions.
Let me know if the issue persists.
Regards
DP