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Model selection metric in Custom Vision

It is known (https://docs.microsoft.com/en-us/azure/cognitive-services/custom-vision-service/getting-started-build-a-classifier) that Custom Vision uses k-fold cross validation to evaluate a trained model's performance in the 'Performance' tab, based on precision, recall, and average precision metrics.

Presumably, Custom Vision uses k-fold cross validation to also tune the model's hyper-parameters (~model selection): what metric does it use to perform that task?

azure-custom-vision
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