Adding support for exporting models with variable length input/output to ONNX (#20034)
Summary:
Proposal: https://gist.github.com/pk-g/cc45ff8c5891b5699bffd883a87f13ae?fbclid=IwAR17bRA7Fks4APoZRYiNa93UkLdoFCpRDuIYEx0lNVyPTyaDAShbEnytiQo
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20034
Reviewed By: zrphercule
Differential Revision: D15606731
Pulled By: houseroad
fbshipit-source-id: 247251e07b4893cb3f7a1287948b1f57aadb7851
