mAP in Object Detection is always 0

I’m training an RCNN model into a multiclass dataset, but when i finished configuring the pipeline and started training, everything goes right until I evaluate results. In every epoch the resulting mAP for all classes is 0.0

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Does anyone know, what could be wrong? Is the mistake related to training (I use the train_one_epoch function) or in evaluation? Thanks in advance :grinning: