Pytorch模型转onnx模型实例

时间:2021-05-22

如下所示:

import ioimport torchimport torch.onnxfrom models.C3AEModel import PlainC3AENetCBAMdevice = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")def test(): model = PlainC3AENetCBAM() pthfile = r'/home/joy/Projects/models/emotion/PlainC3AENet.pth' loaded_model = torch.load(pthfile, map_location='cpu') # try: # loaded_model.eval() # except AttributeError as error: # print(error) model.load_state_dict(loaded_model['state_dict']) # model = model.to(device) #data type nchw dummy_input1 = torch.randn(1, 3, 64, 64) # dummy_input2 = torch.randn(1, 3, 64, 64) # dummy_input3 = torch.randn(1, 3, 64, 64) input_names = [ "actual_input_1"] output_names = [ "output1" ] # torch.onnx.export(model, (dummy_input1, dummy_input2, dummy_input3), "C3AE.onnx", verbose=True, input_names=input_names, output_names=output_names) torch.onnx.export(model, dummy_input1, "C3AE_emotion.onnx", verbose=True, input_names=input_names, output_names=output_names)if __name__ == "__main__": test()

直接将PlainC3AENetCBAM替换成需要转换的模型,然后修改pthfile,输入和onnx模型名字然后执行即可。

注意:上面代码中注释的dummy_input2,dummy_input3,torch.onnx.export对应的是多个输入的例子。

在转换过程中遇到的问题汇总

RuntimeError: Failed to export an ONNX attribute, since it's not constant, please try to make things (e.g., kernel size) static if possible

在转换过程中遇到RuntimeError: Failed to export an ONNX attribute, since it's not constant, please try to make things (e.g., kernel size) static if possible的错误。

根据报的错误日志信息打开/home/joy/.tensorflow/venv/lib/python3.6/site-packages/torch/onnx/symbolic_helper.py,在相应位置添加print之后,可以定位到具体哪个op出问题。

例如:

在相应位置添加

print(v.node())

输出信息如下:

%124 : Long() = onnx::Gather[axis=0](%122, %121), scope: PlainC3AENetCBAM/Bottleneck[cbam]/CBAM[cbam]/ChannelGate[ChannelGate] # /home/joy/Projects/models/emotion/WhatsTheemotion/models/cbam.py:46:0

原因是pytorch中的tensor.size(1)方式onnx识别不了,需要修改成常量。

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