feat(server): refresh face detection

[mertalev]

Description

This PR allows re-running face detection without clearing face data. This can be done on one or more assets with the "Refresh faces" option, or for all assets in the job panel with a new Refresh button.

It compares existing and new bounding boxes for an asset with the IoU metric. If a new bounding box is above the IoU threshold, it's considered a duplicate of an existing face and skipped. If an existing face doesn't appear in the new set of bounding boxes, it's removed.

To make the three options of Reset / Refresh / Missing work with the current API, a distinction is made between force being undefined and false. The former maps to Refresh, and the latter maps to Missing.

Testing:

• Increasing the detection threshold and re-running removes existing faces below the new threshold
• Lowering the threshold and re-running adds new faces
• Refreshing with the same face detection settings doesn't change anything
• "Missing" and "All" (now called "Reset") behave the same
• Refreshing faces for a single asset works as expected

[pyorot]

seems like time to put all the Refresh… options in a sub-menu

[radh21301]

Hey. Would this also work when we change the facial recognition model? Like from buffalo_l to antelopev2. I suppose not?

[mertalev]

No, there are a few more things that would need to happen to let you switch without resetting everything. But it's a big step toward that.