Extended class for onnx_chainer export

[yonglizhong]

Hi all. I've recently downloaded a Light-Head RCNN model and used it for my study project. I'm now interested in exporting as an Onnx model. Was wondering if it's feasible since the model object waits for a chainer.Chain object. My model is a Class extension of a chainer.Chain class and within it consists of also a few more chainer.Chain objects.
I will attempt with it soon but would just like to ask around if anyone had the experience of just exporting the full model. Thanks

[disktnk]

if anyone had the experience of just exporting the full model

sorry, I haven't tried such nested model.

export requires all computational graph are connected from input to output via FunctionNode. If sub-chainer.Chain is disconnectted from main-chainer.Chain graph, it will be failed. IOW, it possible enable to export the target model if all function node are connected as one computational graph.

ref: #128

[yonglizhong]

I have used Chainer.Function instead of FunctionNode. Was wondering if that will be a problem?

[disktnk]

Almost chainer.functionss wrap chainer.FunctionNode. Users don't have to care FunctionNode is used or not in many cases. But some chainer.functions such as sign, don't break down to FunctionNode, means ONNX-Chainer cannot export model using sign.