Import ONNX models / models from other frameworks about convnetsharp

[cbovar]

It would be great to load ONNX file. So far this is not implemented.
I'm not very familiar with ONNX but I understand data is represented as a computation graph.

So it would go like this:

1. Read ONNX file / computation graph (protobuf)
2. Create computation graph using ConvNetSharp.Flow

There are only a few ops (computation graph nodes) implemented but that could be enough to run simple models.
I think this is completely feasible :)

[cbovar]

I gave it a try: You can take a look at the branch Onnx
This class implements basic onnx loading (Conv / Relu and MaxPool ops).

But some more ops such as Gemm , Gather, Concat, Unsqueeze, Reshape, Constant, Shape, are needed, even for a simple model such as model.py:

Some of those ops already exist here, others have to be implement (e.g. Gemm).