C5W2A2 : Emojify! - Cell #13. Can't compile the student's code

Course Q&A Deep Learning Specialization Sequence Models
1

I have have run all cells in the notebook and received all test passed.
However, when I submit I get the following message:
Exercise 5:
Cell #13. Can't compile the student's code. Error: ValueError('need at least one array to concatenate',)

The problem is that I cannot understand where I have done something wrong.
As far as I can tell the cells are not numbered so the reference to Cell 13 is useless.
I can also not find anywhere where my code even attempts to do any concatenation of arrays.
Any thought on what the underlying problem might be?

2

The grader numbers the cells in sequence from the top of the notebook. Just count up from 1.

3

Did your notebook pass all of the tests in in the “model_test()” cell?

That’s Cell 12. I don’t see anyting in Cell 13 (where the model is run) that should cause a concatenate error.

Questions (Please answer all of them):

  • Did you change the name of your notebook?
  • Did you add any new cells to the notebook?
4

My notebook passes all the tests in the “model_test()” cell
Answers:

  • I did not change the name of my notebook.
  • I did not add any new cells to the notebook.

I did leave the notebook open for a while and had to reload it when I returned.

6

Update: Be sure you do not split the sentence only on spaces. Use split() instead of split(’ '), so it splits on any whitespace.

7

I think you meant:
Use split() instead of split(’ ') so it splits on any whitespace.