A name can be used as both Input/Output

[shinh]

Probably a bug?

import numpy as np
import chainer
import chainer.functions as F

import onnx_chainer


class Model(chainer.Chain):
    def forward(self, x):
        return F.relu(x), x


model = Model()
x = model.xp.array([2,3], dtype=np.float32)
onnx_chainer.export(model, [x], 'o.onnx')

Output ONNX:

$ python3 -c 'import sys; import onnx; print(onnx.helper.printable_graph(onnx.load(sys.argv[1]).graph))' o.onnx
graph Graph (
  %Input_0[FLOAT, 2]
) {
  %Relu_0 = Relu(%Input_0)
  return %Relu_0, %Input_0
}