Possible appendix (if you want to add one) should include information that is not really necessary to be part of 8 pages, extra images (not essential), or possibly the architectures that you employed.
"everything in the appendix should be considered as extra. If we would remove the entire appendix, the story should stay ~ the same"
For the code, you should upload it, in a notebook format. It needs to be clear how we can replicate your experiments (at least from the description) or possibly in comments #learning_rate = ... and so forth.
Possible appendix (if you want to add one) should include information that is not really necessary to be part of 8 pages, extra images (not essential), or possibly the architectures that you employed.
"everything in the appendix should be considered as extra. If we would remove the entire appendix, the story should stay ~ the same"
For the code, you should upload it, in a notebook format. It needs to be clear how we can replicate your experiments (at least from the description) or possibly in comments #learning_rate = ... and so forth.
All the datasets can be included with a script.