The recall can be computed as: R e c a l l = T P T P + F N Precision and recall should show an increasing trend as the number of epochs increase.
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The sentences
The val Box , the val Objectness and the val Classification plots are the loss trends, respectively, for the box loss metric, for the objectness and for the classification loss relating to the testing dataset: as in the previous plots, in these cases, we expect a decreasing trend when the number of epochs is increasing.