Update nanodet_plus_head.py #573
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修复多GPU情况下，len(pos_inds) == 0时（当前Batch中的所有图像中均没有检测框真值），reduce_mean不执行导致的dist.all_reduce空等待，卡死的问题。
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修复多GPU情况下，len(pos_inds) == 0时（当前Batch中的所有图像中均没有检测框真值），reduce_mean不执行导致的dist.all_reduce空等待，卡死的问题。