测试PyTorch版本：1.2.0
测试代码：
import torch.onnx
model = ******** # model类型：torch.nn.Module
dummy_input = torch.randn(1, 3, 224, 224) # 模型输入维度为(1, 3, 224, 224)
input_names = ["input"]
output_names = ["output"]
torch.onnx.export(model, dummy_input, "model_onnx.onnx", verbose=True,
input_names=input_names, output_names=output_names)
