Do not have combined train+val progress bar, keep bar output after epoch is finished

[elistevens]

🚀 Feature

The progress bar labeled "Epoch" should be renamed to "Train" and the validation data should be displayed only in a separate bar.

Additionally, each epoch should leave the final training and validation bar on-screen for visual inspection.

Motivation

It's confusing that training and validation are shown in a single bar, and it destroys the information about the iterations/sec from training. Since validation is faster, the value spikes up right at the end.

Pitch

Have two separate bars, one for training, one for validation, and none combined.

After a bar fills up, move the cursor down a line to not overwrite it.

[danieltudosiu]

This can easily be done with tqdm. Here is their example.

We can have their "1st loop" as our experiment loop (which encompasses training+validation epochs) and then have one progress bar per training epoch and another one per validation epoch.

[awaelchli]

I would also like to see the two progress bars to be split completely, but I would still prefer it disappears after the epoch is done, otherwise it fills up the terminal unnecessarily. I prefer to inspect my metrics in the logger. (Just my opinion of course)

[awaelchli]

The progress bar is now a callback. Is there a desire for an alternative of a split progress bar? We could add this simply as an extra callback and the user can choose it.
This could also go to bolts.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.