Is your feature request related to a problem? Please describe.
add batch_nms to box util

Describe the solution you'd like

• Please refer to batch_nms in
  https://github.com/pytorch/vision/blob/main/torchvision/ops/boxes.py
• update NMS in detector into batch_nms

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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