flush away images in the napari window

[jxchen01]

Suppose I am at the "thresholding" step, everything is fine. Then, if i click the "Prediction" tab, then all my images are gone...

Why I clicked "Prediction" again? Maybe I want to try a different model. Maybe I just clicked it accidentally. No matter what, it should not flush away my images in my napari window.

[hughes036]

@thao-do this was a UX design decision, correct? Is there a bigger context?

[thao-do]

The main reason was because the leftover images from one module interfering with the interactions with another module:

• Before curation starts, the viewport needed to be cleared of any extra images so it doesn't affect the display of the raw/seg image pairs (I think it's mostly just for look, as the user can still proceed without problem if there were extra images hidden in the layer list?).
• Once curation is completed, the last images loaded are no longer needed for further interaction so they also get cleared out. (Although if the user is in the middle of curation and switch to the Training tab or Prediction tab (just to look) then return to the Curation tab, their curation state is preserved).
• So the curation process needs the viewport dedicated just for itself
• For training, the viewport is not needed -- we can ignore
• For prediction, for a user to even get to perform prediction, they need to have a trained model; in that case they'd no longer have access to the Curation & Training tab >> no concern in switching between these 3 modules at this stage
• For Thresholding, this is the new process added, however it inherits the 'image clearout' behavior from the other modules. This became problematics as user might go back and forth between the two tabs to add more images to run prediction and test out different thresholds, then compare the results together.