Instance Segmentation Mean Average Precision

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Description

Currently the metrics have a MeanAveragePrecision class that works for object detection. It would be great to have an implementation for mAP for masks of an instance segmentation model.

I'd expect only from_detections static method would be used, instead of the from_tensors, without any API change, as the former uses Detections, and these have a mask attribute already.

This goes probably hand in hand with #238.

Use case

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Additional

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Are you willing to submit a PR?

• Yes I'd like to help by submitting a PR!