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The purpose of this document is to define the use cases for ONNX usage in MXNet, primarily import and export and proposing a technical design that addresses these use cases. We have implemented the import functionality already but the code is in an external repository in the onnx org controlled by Facebook.  The design also should be generic enough to extend it to other formats later when needed.

Use cases:

1)    Import ONNX into MXNet symbolic interface for inference.

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