Uploading large amounts of annotations

2024-04-30: Currently the process of uploading large amounts of annotations uses excessive amounts of memory.

Observations

There seems to be a data structure for undo and redo. This can be found in the file static/video_annotator.js around line 412 in the functions on_undo and on_redo. Eash time the annotations are updated, the new state is added to the this.states list.

If this is used for each individual annotation that is added from the uploaded csv file, the memory consumption will scale quadratically - O(n^2).

One approach for dealing with this is to avoid adding states to this.states when uploading annotations from a csv file.

Table with observations on number of annotations and memory usage:

Annotations	Memory
0	120
1	772
2	2052
3	3956
4	6484
5	9640
6	13424
7	17832

Solution

The implemented solution is to avoid saving the state on the undo stack for each new annotation added from the uploaded csv file.

This solutions have been implemented.