Split operator

[cedricjoulain]

Hello I'm trying to convert a "classical" YoloV8 (10MB) .onnx and I get this error:

./onnx2c yolov8n.onnx
2023-03-27 15-28-59.799 [Fatal] (createNode) Unimplemented: node operation Split
Assertion failed: (false), function createNode, file graph.cc, line 483.
zsh: abort ./onnx2c yolov8n.onnx

[bayesiandog]

Hi, any updates on this?

[kraiskil]

@mryndzionek started with this: https://github.com/kraiskil/onnx2c/pulls
Doesn't look like there would be any showstoppers (i.e. dynamic memory allocation) with Split.

[mryndzionek]

@mryndzionek started with this: https://github.com/kraiskil/onnx2c/pulls Doesn't look like there would be any showstoppers (i.e. dynamic memory allocation) with Split.

In the end I managed to simplify my model to not use Split, so I probably won't continue with this, but I have a naive and untested implementation of print for Split. I can push it to my PR. Writing tests for it would be necessary though (also tried, but encountered problems with installing all the necessary Python modules with python 3.10-3.11).

[kraiskil]

Please do push it, would be cool to have it in.
It is always easier to fix something than write it from scratch :) (This is trivially true, since after writing something from scratch, it still would need that fixing...). And it's nicer to have something than nothing.

Python shouldn't be necessary to run the unittests, btw.
I consider it sufficient enough to have the ONNX node backend tests in place (i.e. onnx/onnx/backend/test/data/node/test_split_*). They are automatically taken into use when added to the list here:

onnx2c/test/CMakeLists.txt

Line 724 in 687d523

ONNX_backend_node_test(sqrt)

If some tests don't pass, it would be super nice to have the resolve step catch what is causing them to fail, and error out.
That corner case of the split operator can then be considered as not implemented.

[mryndzionek]

Python shouldn't be necessary to run the unittests, btw.

Okay, good to know. I was looking at test/local_ops and Python scripts there.

[kraiskil]

Ah, right. That directory has extra tests for corner cases that ONNX backend tests doesn't test for. I used the python scripts to generate such tests, and left the scripts in place as a reference for the future. Sorry for the confusion :)

[kraiskil]

PR #51 just got merged in. Maybe it helps?