#core function
def yolo_loss( target,
output,
coord_mask, object_detections, object_no_detections_gt_anch, gt_coord, gt_conf,
object_scale=5.0,
no_object_scale=1.0,
coordinates_scale=3.0
)
#parameters production
target: #label
output: #net output
coord_mask, object_detections, object_no_detections_gt_anch, gt_coord, gt_conf：
#groundtruth related parameters that obtained by function build_groundTrue_targets_masks in file postproc.py
