Fail to export net to ONNX

Question

Patrick ONeal 2019-4-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/455856-fail-to-export-net-to-onnx

评论： Patrick ONeal 2019-5-20

I'm trying to use the exportONNXNetwork function, in order to load it later into CNTK, but I'm getting a lot of warnings that I don't understand. I was hoping to get some pointers on what they might mean.

>> load('netTry.mat')
>> netFileToOMX = 'netFileToOMX_try1';
>> exportONNXNetwork(net,netFileToOMX);

This is the code i'm using, and here are the warnings:

A bunch of these:

Warning: ONNX does not support layer 'nnet.cnn.layer.Image3DInputLayer'. Exporting to ONNX operator 'com.MathWorks.Placeholder'. 
> In nnet.internal.cnn.onnx.NNTLayerConverter.makeLayerConverter (line 173)
  In nnet.internal.cnn.onnx.ConverterForNetwork/networkToGraphProto (line 80)
  In nnet.internal.cnn.onnx.ConverterForNetwork/toOnnx (line 44)
  In nnet.internal.cnn.onnx.exportONNXNetwork (line 34)
  In exportONNXNetwork (line 40) 
Warning: ONNX does not support layer 'nnet.cnn.layer.Convolution3DLayer'. Exporting to ONNX operator 'com.MathWorks.Placeholder'. 
> In nnet.internal.cnn.onnx.NNTLayerConverter.makeLayerConverter (line 173)
  In nnet.internal.cnn.onnx.ConverterForNetwork/networkToGraphProto (line 80)
  In nnet.internal.cnn.onnx.ConverterForNetwork/toOnnx (line 44)
  In nnet.internal.cnn.onnx.exportONNXNetwork (line 34)
  In exportONNXNetwork (line 40) 
Warning: ONNX does not support layer 'nnet.cnn.layer.Convolution3DLayer'. Exporting to ONNX operator 'com.MathWorks.Placeholder'. 
> In nnet.internal.cnn.onnx.NNTLayerConverter.makeLayerConverter (line 173)
  In nnet.internal.cnn.onnx.ConverterForNetwork/networkToGraphProto (line 80)
  In nnet.internal.cnn.onnx.ConverterForNetwork/toOnnx (line 44)
  In nnet.internal.cnn.onnx.exportONNXNetwork (line 34)
  In exportONNXNetwork (line 40) 

And finally this:

  Error using nnet.internal.cnn.onnx.ConverterForSoftmaxLayer/toOnnx (line 32)
Assertion failed.
Error in nnet.internal.cnn.onnx.ConverterForNetwork/networkToGraphProto (line 81)
                [nodeProto, paramInitializers, paramInputs, netInputs, netOutputs, layerMap] = toOnnx(layerConverter, TensorNameMap);
Error in nnet.internal.cnn.onnx.ConverterForNetwork/toOnnx (line 44)
            modelProto.graph            = networkToGraphProto(this);
Error in nnet.internal.cnn.onnx.exportONNXNetwork (line 34)
modelProto  = toOnnx(converter);
Error in exportONNXNetwork (line 40)
nnet.internal.cnn.onnx.exportONNXNetwork(Network, filename, varargin{:});

Any help appreciated.

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Answer 1

Don Mathis 2019-4-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/455856-fail-to-export-net-to-onnx#answer_370368

I don't think you'll be able to export 3d image networks until the support package supports it (expected later this year). If you're able to post your network here, I could see if there are any other potential issues besides the 3d Conv layers.

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Don Mathis 2019-5-20

Yes, the ONNX Converter support package is being actively developed by MathWorks. However, we have a policy not to estimate when, or even if, specific future features will be available. So I can't make any promises beyond saying that exporting 3d networks is considered highly important to us.

Patrick ONeal 2019-5-20