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## MMCV中ONNX模块简介 (实验性)
### register_extra_symbolics
在将PyTorch模型导出成ONNX时，需要注册额外的符号函数
#### 范例
```python
import mmcv
from mmcv.onnx import register_extra_symbolics
opset_version = 11
register_extra_symbolics(opset_version)
```
#### 常见问题
- 无