What is overlap?

Overlap is the number of Tolokers who should complete each task in the pool.

You can set overlap in the pool settings:

Tips and recommendations

Task typeRecommended overlap
Most tasks have automatic acceptancefrom 3 to 5
Simple task3
Reviewed task1

You can change overlap after the pool is started. To do this, open the pool editing mode and set the new overlap value. You don't need to restart the pool. Updating the settings is usually fast, but if there are many tasks, it may take several minutes.

Advanced overlap types

  • Dynamic overlap lets you change overlap depending on:

    • How well the Tolokers do on the task.

    • How well Tolokers' responses match each other.

      This type of overlap helps you save money without reducing the quality of data labeling.

  • Selective majority vote verification allows you to set up majority vote check for only a portion of tasks.

    This type of overlap helps you save money and speed up pool completion.

For developers


Can I do it like this: set a basic overlap of 2 Tolokers, then, if both Tolokers select the same response, close the pool, but if they give different responses, show the task to one more user?
Is there a cross-check feature for tasks?
Why is the maximum number of submitted assignments in the progress bar less than the total number of uploaded tasks?
How does counting work if I set `overlap = 3` in the pool and `response threshold = 3` in the majority vote?
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