cycle-free graph violated: partition depends on itself

Hi @fpjentzsch,
I ran into the same problem and I tried the same thing with ResNet-50 but it still failed.

In detail

I ran into a problem while executing model.transform(CreateDataflowPartition()).

I made some adjustments and tests (see https://github.com/Xilinx/finn/issues/860#issuecomment-1649853296 for details), but the error still occurred.

Then I looked at the answers in this issue, and I used the ResNet-50 process to re-tune my code, but I was still stuck.

Part of the onnx file when resnet-50 is not used, see https://github.com/Xilinx/finn/issues/860#issuecomment-1649853296

Part of the onnx file when using resnet-50, as follows.

I guessed that it was due to the concat operation, so I stopped using concat and split all the output, but still had the same problem.

I hope you can help me solve this problem.

Thanks again.

Originally posted by @Special-zhang in https://github.com/Xilinx/finn/discussions/431#discussioncomment-6546507

Start at the model.transform(CreateDataflowPartition()) call and compare the ONNX graph examples and adjustments linked from issue #860. Trace how the partitioning step detects dependencies, then reproduce the cycle with the reported ResNet-50 and non-ResNet graphs; done means identifying the cause and resolving or clearly documenting the self-dependency.