Conversion from the opset-8 Scan op to opset-9 (or newer).

[negiyas]

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Question

Can we rewrite(convert) opset-8 of onnx.Scan op with opset-9 (or newer) of onnx.Scan (or another) op?

Further information

• Relevant Area (e.g. model usage, backend, best practices, converters, shape_inference, version_converter, training, test, operators): Since opset-8 of onnx.Scan op has the batch size dimensions and opset-9 (or newer) does hot have the batch size dimension, it is not simple to convert opset-8 Scan op to opset-9 scan op. Is there a simple mapping between them? Any information about the conversion are very welcome.

• Is this issue related to a specific model? Model name (e.g. mnist):
  The bidaf-9 model in model zoo, text/machine_comprehension/bidirectional_attention_flow/model/bidaf-9.onnx includes opset-8 onnx.Scan op. Model opset (e.g. 7): 9, but opset of onnx.Scan op should be 8. .

[jcwchen]

Hi @negiyas, ONNX does have an adapter (Scan-8 to Scan-9) to support such a conversion in onnx.version_converter. You can try the example to convert your opset 8 ONNX models into opset 9.

[negiyas]

Hi @jcwchen, I am looking at the Scan-8 to Scan-9 adapter. Thank you very much for your helpful answer.