ONNX 模型精简# 查看：onnxsim 与 onnx-optimizer ONNX GatherND onnx L2 范数 torch2onnx：Scatter ScatterElements onnx ScatterND torch2onnx SequenceConstruct torch转ONNX：Unsqueeze torch转ONNX：Upsample BN+conv onnx conv+reshape torch.Tensor.expand() 转换 onnx flatten torch 索引转换 torch.Tensor.repeat() 转换 Resize torch 切片转换 torch转ONNX：split
