UI becomes slow after 300-400 annotations

[wronk]

I'm labeling large satellite images with hundreds to a few thousand objects of interest.

I noticed that after about 300-400 annotations, the UI slows down. It might take the program ~1 sec to become responsive again after creating a new bbox. After about 800-1000 annotations, it's nearly unusable -- adding an annotation might require ~5 seconds before it will register. For now, I'm just cropping my large images into smaller pieces as a workaround, but it'd be a lot nicer to add all annotations to a single large image (as raw satellite imagery often comes in fairly long strips). I'm using a 2017 MacBook pro to do the labeling.

I don't know enough about the backend to suggest a fix, but happy to answer questions if it's helpful.

[nmanovic]

@wronk ,

We will look at the problem. If you can provide us your image + annotation file it will help us to reproduce it easily on our side. Probably our tool isn't optimized for such cases. Need to check how to improve it.

[nmanovic]

Also I remember that we had similar problems for semantic/instance segmentation and Boris fixed similar issues. If it is the case the problem will be fixed with next major release.

[wronk]

@nmanovic, thanks for checking into this. Here are both files -- let me know if you have any problems or need more help.

CVAT_issue_39_example_case.zip

[nmanovic]

@bsekachev ,

Could you please look at the problem? Was it fixed already?

[nmanovic]

Hi @wronk,

• I can reproduce your performance problems on the latest version of CVAT.
• I cannot upload your annotation file as is because a lot of coordinates for bounding boxes are out of image size. My guess that huge image resolution can be a reason for that. Did you crop the attached image or it has original size?

We will work to resolve both problems. Thanks for your feedback.

[wronk]

Hey @nmanovic, I think I've gotten this working. I do have 2 versions of the image, but I think I have the correct one included here. I was able to remake the task with the included files.

I did have an issue where I had to manually change the version tags in the annotation file to get it to sync properly to a newly created task. Specifically, these lines in the xml file need to match the task you create (e.g., task 25) on your cvat instance:

  <meta>
    <task>
      <id>25</id>

        <segment> 
         <id>25</id>
          <start>25</start>
          <stop>25</stop>
          <url>http://localhost:8080/?id=25</url>
        </segment>

Let me know if that fixes it for you