Multiple jobs for the same segment

[anderflash]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Expected Behaviour

The idea is to have multiple annotators to the same set of images (so we can cross-validate them).

Current Behaviour

Currently we need to create multiple tasks with the same image set, which waste space.

Possible Solution

Two approaches:

• One task, two jobs, same frame range for them, one assignee per job. (maybe one option for the user to input which frames this job is linked to)
• One task, one job, multiple assignees per job (perhaps like the Gitlab's label selection UI component)

I think the general idea is to provide a manual control over the range of frames per job (the overlap/segment size/start/end would be the automatic version of it). Nowadays we can't have a full overlap (otherwise we have a infinite loop with the current CVAT code).

Steps to Reproduce (for bugs)

Not applicable (I think the issue description is self contained)

Context

Datasets whose subsets can be annotated by multiple users.

Your Environment

• Git hash commit (git log -1): 42fb305
• Docker version docker version (e.g. Docker 17.0.05): Docker version 19.03.8-ce, build afacb8b7f0
• Are you using Docker Swarm or Kubernetes? Docker
• Operating System and version (e.g. Linux, Windows, MacOS): Linux 5.6.11-1-MANJARO Is there any documentation? #1 SMP PREEMPT Wed May 6 10:20:32 UTC 2020 x86_64 GNU/Linux
• Code example or link to GitHub repo or gist to reproduce problem:

[nmanovic]

#125 (similar issue)

[bsekachev]

Let's close it because it is a dublicate