machine learning - How to export an MXNet?

I was hoping there was some way to generate the .params and .json file needed to define an MXNet model, from a network trained using NetTrain[] in Mathematica. I was hopeful because I found these functions in the NeuralNetworks` package:

NeuralNetworks`ToMXNetSymbol
NeuralNetworks`ToMXNetJSON

You can use them on a net link this:

<< NeuralNetworks`;

net = NetInitialize@NetChain[{
     ConvolutionLayer[20, {5, 5}],
     ElementwiseLayer[Ramp],
     PoolingLayer[{2, 2}, {2, 2}],
     FlattenLayer[],
     DotPlusLayer[500],
     ElementwiseLayer[Ramp]
     }, "Input" -> NetEncoder[{"Image", {32, 32}}]];
ImportString[Normal@NeuralNetworks`ToMXNetJSON[net][[1]], "RawJSON"]
NeuralNetworks`ToMXNetSymbol[net]

Now, ToMXNetJSON[] returns a tuple, and it looks like the first element is the JSON for the symbol file. But I don't know what the second element is, and I don't have a clue as to what ToMXNetSymbol[] is returning.

Motivation: A solution to this would enable one to take any net from MMA and run it in C or Python with GPU inference!

Comments

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