Onnx model checker error

[ElMahdiElAnnabi]

Hi everyone,
when i check the model tfc-w1a2.onnx or any other model with onnx.checker.check_model i receive the following error:
onnx.onnx_cpp2py_export.checker.ValidationError: No opset import for domain 'finn.custom_op.general'
any idea??
thanks in advance

[heborras]

Hi @ElMahdiElAnnabi,
FINN uses custom node types in it's ONNX graphs to represent functionality not supported by the standard ONNX op-set. This is for example quantization below 8 bits, Multi-threshold activations and so on. Since these nodes are not part of the official op-set the onnx model checker will say that it doesn't know what to do with these nodes. So, the error which you are seeing is in a sense expected behavior, due to how FINN implements its custom ops.

[ElMahdiElAnnabi]

hi @HenniOVP,
thank you so much for your answer!