ZeroDivisionError when attempting to download annotations

[akarimbux]

My actions before raising this issue

I searched both existing issues and gitter for this error and couldn't find a reference

Current Behaviour

XML that causes this issue attached.

I am running into an issue with the TASK endpoint where annotations that have loaded successfully raise an error when I attempt to download them. The created task has a segment size of 1500 frames and 5 frames of overlap. This generates 2 jobs against which the attached annotation xml file is loaded.

Without making any changes to the annotations, attempting to download them, throws the following error:

`
2020-04-20 17:56:51,915 DEBG 'rqworker_default_1' stderr output:
17:56:51 cvat.apps.engine.utils.InterpreterError: AssertionError
Traceback (most recent call last):
File "/home/django/cvat/apps/engine/utils.py", line 45, in execute_python_code
exec(source_code, global_vars, local_vars)
File "", line 1, in
File "", line 393, in dump_as_cvat_interpolation
File "/home/django/cvat/apps/annotation/annotation.py", line 341, in tracks
tracked_shapes = TrackManager.get_interpolated_shapes(track, 0, self._db_task.size)
File "/home/django/cvat/apps/engine/data_manager.py", line 360, in get_interpolated_shapes
assert shape["frame"] > curr_frame
AssertionError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/rq/worker.py", line 812, in perform_job
rv = job.perform()
File "/usr/local/lib/python3.5/dist-packages/rq/job.py", line 588, in perform
self._result = self._execute()
File "/usr/local/lib/python3.5/dist-packages/rq/job.py", line 594, in _execute
return self.func(*self.args, **self.kwargs)
File "/home/django/cvat/apps/engine/annotation.py", line 135, in dump_task_data
annotation.dump(filename, dumper, scheme, host)
File "/home/django/cvat/apps/engine/annotation.py", line 740, in dump
execute_python_code("{}(file_object, annotations)".format(dumper.handler), global_vars)
File "/home/django/cvat/apps/engine/utils.py", line 54, in execute_python_code
raise InterpreterError("{}".format(error_class))
cvat.apps.engine.utils.InterpreterError: AssertionError
Traceback (most recent call last):
File "/home/django/cvat/apps/engine/utils.py", line 45, in execute_python_code
exec(source_code, global_vars, local_vars)
File "", line 1, in
File "", line 393, in dump_as_cvat_interpolation
File "/home/django/cvat/apps/annotation/annotation.py", line 341, in tracks
tracked_shapes = TrackManager.get_interpolated_shapes(track, 0, self._db_task.size)
File "/home/django/cvat/apps/engine/data_manager.py", line 360, in get_interpolated_shapes
assert shape["frame"] > curr_frame
AssertionError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/rq/worker.py", line 812, in perform_job
rv = job.perform()
File "/usr/local/lib/python3.5/dist-packages/rq/job.py", line 588, in perform
self._result = self._execute()
File "/usr/local/lib/python3.5/dist-packages/rq/job.py", line 594, in _execute
return self.func(*self.args, **self.kwargs)
File "/home/django/cvat/apps/engine/annotation.py", line 135, in dump_task_data
annotation.dump(filename, dumper, scheme, host)
File "/home/django/cvat/apps/engine/annotation.py", line 740, in dump
execute_python_code("{}(file_object, annotations)".format(dumper.handler), global_vars)
File "/home/django/cvat/apps/engine/utils.py", line 54, in execute_python_code
raise InterpreterError("{}".format(error_class))
cvat.apps.engine.utils.InterpreterError: AssertionError
`

Sometimes a different error is thrown using the same set of actions above:
ZeroDivisionError: division by zero Traceback (most recent call last): File "/usr/local/lib/python3.5/dist-packages/rq/worker.py", line 812, in perform_job rv = job.perform() File "/usr/local/lib/python3.5/dist-packages/rq/job.py", line 588, in perform self._result = self._execute() File "/usr/local/lib/python3.5/dist-packages/rq/job.py", line 594, in _execute return self.func(*self.args, **self.kwargs) File "/usr/lib/python3.5/contextlib.py", line 30, in inner return func(*args, **kwds) File "/home/django/cvat/apps/engine/annotation.py", line 112, in load_task_data annotation.upload(filename, loader) File "/home/django/cvat/apps/engine/annotation.py", line 761, in upload self.create(annotation_importer.data.serialize()) File "/home/django/cvat/apps/engine/annotation.py", line 697, in create self._patch_data(data, PatchAction.CREATE) File "/home/django/cvat/apps/engine/annotation.py", line 687, in _patch_data self._merge_data(_data, jobs[jid]["start"], self.db_task.overlap) File "/home/django/cvat/apps/engine/annotation.py", line 691, in _merge_data data_manager.merge(data, start_frame, overlap) File "/home/django/cvat/apps/engine/data_manager.py", line 22, in merge tracks.merge(data.tracks, start_frame, overlap) File "/home/django/cvat/apps/engine/data_manager.py", line 107, in merge int_obj, old_obj, start_frame, overlap) File "/home/django/cvat/apps/engine/data_manager.py", line 278, in _calc_objects_similarity return 1 - error / count ZeroDivisionError: division by zero

Your Environment

• Git hash commit (git log -1): feebec2
• Docker version docker version (e.g. Docker 17.0.05): 19.03.8
• Are you using Docker Swarm or Kubernetes? No
• Operating System and version (e.g. Linux, Windows, MacOS): Ubuntu

Next steps

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bad.xml.txt

[nmanovic]

@azhavoro , please verify that we already have a fix for the issue. Otherwise please assign a correct milestone target.

[azhavoro]

should be fixed by #1396, but need to re-upload annotation.

[joon612]

It seems reproduced in current version. (commit id: 2b221d2).
docker version: 19.03.13
Operating System: Ubuntu 18
We have 1 task including 11 jobs. After annotation, we cannot dump annotations by 'cvat for videos 1.1'.

cvat_server.log
[2021-05-25 03:02:45,692] ERROR cvat.server.task_1608: [cvat.apps.dataset_manager.views @ export_task]: exception occurred
Traceback (most recent call last):
File "/home/django/cvat/apps/dataset_manager/views.py", line 61, in export_task
task.export_task(task_id, temp_file, dst_format,
File "/home/django/cvat/apps/dataset_manager/task.py", line 744, in export_task
task.init_from_db()
File "/home/django/cvat/apps/dataset_manager/task.py", line 622, in init_from_db
self._merge_data(annotation.ir_data, start_frame, overlap)
File "/home/django/cvat/apps/dataset_manager/task.py", line 593, in _merge_data
annotation_manager.merge(data, start_frame, overlap)
File "/home/django/cvat/apps/dataset_manager/annotation.py", line 149, in merge
tracks.merge(data.tracks, start_frame, overlap)
File "/home/django/cvat/apps/dataset_manager/annotation.py", line 233, in merge
cost_matrix[i][j] = 1 - self._calc_objects_similarity(
File "/home/django/cvat/apps/dataset_manager/annotation.py", line 407, in _calc_objects_similarity
return 1 - error / count
ZeroDivisionError: division by zero
[2021-05-25 03:02:45,809] ERROR django.request: Internal Server Error: /api/v1/tasks/1608/annotations

[azhavoro]

@joon612 Please provide steps to reproduce this issue

[joon612]

@azhavoro
We create a cvat task by cli, including 11 jobs, "segment_size": 4500.
After that we do annotation jobs, labeling manually.
After annotation job, we save operations and return to task page.
We use 'Actions -> Dump annotations -> CVAT for video 1.1' to dump annotation file.
Finally we got this error in the upper right corner of the screen.

Thanks.