Orca only supports basic metrics, some customized metrics do not support

[zhanglirong1999]

Ap is used in yolox to evaluate the final results. AP is often used as an indicator metric for object detection and the implementation of Ap and principle are more complicated. Therefore, orca does not support such a complex metrics.

AP Basic Concepts: https://www.cnblogs.com/itmorn/p/14193729.html

A part of implementation in yolox to calculate AP
https://github.com/Megvii-BaseDetection/YOLOX/blob/7ba9fd298413b79f2d07b6b7a3cdcbc34a9b244d/yolox/evaluators/coco_evaluator.py#L53