Reproducing M4 Results about n-beats

[Dolores2333]

This may because you used the wrong notebook server. I came with the same error when I used the JupyterLab on my server directly to open the .ipynb files rather than using the one created by 'make notebook port=XXXX'.

My solution is:

1. Finish training, forecasting and download the outcomes from my server to my computer(Mac).
2. open docker on my PC.
3. enter a terminal, 'make init' under the the N-BEATS folder where the downloaded outcomes are stored in ./storage/experiments/m4 for example.
4. 'make notebook port=XXXX'
5. open a browser, for example chrome.
6. type 'localhost:XXXX' and open this website
7. Now you reached the right notebook server.