code: def _register_custom_op():
      torch.onnx.register_custom_op_symbolic(
          "torchvision::nms",
          symbolic_multi_label_nms,
          _ONNX_OPSET_VERSION_11,
      )
      torch.onnx.register_custom_op_symbolic(
          "torchvision::roi_align",
          roi_align_opset11,
          _ONNX_OPSET_VERSION_11,
      )
      torch.onnx.register_custom_op_symbolic(
          "torchvision::roi_align",
          roi_align_opset16,
          _ONNX_OPSET_VERSION_16,
      )
      torch.onnx.register_custom_op_symbolic(
          "torchvision::roi_pool", roi_pool, _ONNX_OPSET_VERSION_11
      )
  
file_path: vision/torchvision/ops/_register_onnx_ops.py
imports: import sys
  import warnings
  import torch
  from torch.onnx import symbolic_opset11
  from torch.onnx.symbolic_helper import parse_args
label_desc: Use image node_id 8 for calling a global function with example usage: _register_custom_op() without return types