Function eval_map

Evaluate mAP of a dataset. Args: det_results (list[list]): [[cls1_det, cls2_det, ...], ...]. The outer list indicates images, and the inner list indicates per-class detected bboxes. annotations (list[dict]): Ground truth annotations where each item of

(det_results,
             annotations,
             scale_ranges=None,
             iou_thr=0.5,
             ioa_thr=None,
             dataset=None,
             logger=None,
             tpfp_fn=None,
             nproc=4,
             use_legacy_coordinate=False,
             use_group_of=False)