Tried resubmitting; restarting browser, kernel, PC; recomputing cells. Nothing works 
Are you getting any errors whatsoever?
unable to submit or unable to pass the grader?
in both cases, both are different issue, so kindly elaborate what is happening.
if you are getting a failed grader, then post a screenshot of your grader submission as it will have information about the reason why it is failing.
if you are not able to see a submit button, then chances are the file you are working might have got corrupt. In the that case, on top right corner, you will notice a 3 dot, when you click on that, you get an option of restor original version, and you should be good to go then. But make sure you also clear your cache and browsing history before you re-try.
Regards
DP
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Exactly! In order for us to help you, you need to explain what you mean by “Unable to submit”. One other thing to point out is that if you resort to the “Restore Original Version” method that Deepti suggested, you need to download a copy of your notebook first: that procedure just overwrites the notebook and you will lose any completed work if you don’t download a copy. Once you have the fresh copy, you’ll need to upload your previous version and carefully “copy/paste” over just your code from the “YOUR CODE HERE” sections only.
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Thank you for all the responses. Please see screenshot. During some attempts there was a brief notification on bottom right of screen, “Network error .. fetch…” - I don’t remember the exact wording.
When I hit submit, there is a green notification indicating that assignment was submitted successfully. The “grading your submission” is active for a while (the blue circle keeps rotating). Still no success. Will try restoring original if nothing works.
Ok, that probably means there is either a) something structurally wrong with your notebook (e.g. you modified areas outside the “YOUR CODE HERE” segments) or b) there is a bug in your code that is bad enough that the grader can’t compile your code. Although in case b), normally you’d get a better error message with more information.
If you want to experiment to see if a) is the case, the procedure would be:
- Download a copy of your current notebook.
- Do the “Restore Original Version”.
- Then open both notebooks in parallel and carefully copy over just your code from the “YOUR CODE HERE” sections.
If that doesn’t help or you’re 100% sure you didn’t “color outside the lines”, then we’ll need to see your notebook in order to make more progress. We can’t do that on a public thread, but check your DMs for a message from me about how to proceed.
I didn’t color outside the line since kindergarten … lol
After several minutes of “blue circle progress,” the current submit failed with “server connection error.”
I will restore the original.
FYI: There’s another thread with the same issue. I linked that one to this thread.
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I also have this very same issue at the moment.
can you show the second time your failed grader submission screenshot as the blue tick part has happened with me too, but within 1-2 mins I have passed assignment, and this has happened several times.
for the server connection, that is more related to kernel connection which ofcourse is very common issue especially when we switch the browser windows, this message pops out. So as paul states, surely, check if notebook was not corrupted or there is issue with your codes.
Also @picnic can you confirm did you save your work before submitting the assignment for grading, as learners have also reported similar issues. So please make sure click on left top corner the save button, and then submit assignment.
To be a bit more verbose, I started the assignment like 3 hours ago, went through it, all tests on the notebook passed, and then at submission I got the same reddish “An unexpected error occurred. Please try again later“ as Picnic posted roughly one hour ago to this thread. I resubmitted several times (more than 5), it takes some 5 mins or so and then displays the same error again.
can you send screenshot of codes by personal DM. I have sent you DM about this @AIKen
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To test the theory that this might be a server problem (aka “Bad Weather in The Cloud”), I just submitted the PyTorch C1 M2 and M4 assignments and both were successfully graded for me.
I won’t say that the performance was exactly “sprightly”, but each submission did complete in no more than a couple of minutes.
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I should make the disclaimer that I am in the San Francisco area and on a fiber connection, so I’ve got a pretty good chance of having a good quality connection to (what I’m almost sure would be) the single AWS instance of the DLAI LP server. Of course YMMV if you are coming from a different continent.
I am trying to add you in DM with @AIKen but somehow it’s not accepting
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@Deepti_Prasad it worked! It looks like AIKen’s code is correct to me, so I think we’re down to the theory that either this is a server side failure that has been corrected or possibly some issue in which the grader was looking at an older version of the notebook.
Yes, I did save using the left top corner.
i pointed as far as the DataLoader class issue in @AIKen but as you remember in the DM he has also sent a file with another screenshot pointing out changes, chances are when he must have got newer version, the environment must have not saved up with his current changes, many times even an improper connection causes issues, that’s why I make sure I save the work environment (this saving is not the same as the cell mentioning save the model path but rather saving up complete jupyter environment) as when I submitted my version file when these 3 learners raised issue, I passed assignment completely within normal 1-2 min duration.
Shall we check your codes, let me send DM