[Relay][Frontend][Onnx] SequenceAt and SplitToSequence Operators #13602
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This PR adds support for some new sequence operators in the onnx frontend. I made a few other small tweaks to get everything working, specifically an attempt to rectify dynamic rank in
If
statements and the removal of a superfluous check in concat's shape function. With these changes, we can import and run the latest Yolo variants which is pretty cool.