Adds Tribuo provenance as a metadata field to exported ONNX models #182
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Description
Factorization Machines, linear models and sparse linear models now export the Tribuo provenance object as a serialized protobuf in a metadata field inside the ONNX model. There is an associated accessor for the Tribuo provenance on
ONNXExternalModel
which returns an optional if the provenance could be extracted.Motivation
We'd like to preserve provenance information even in deployed ONNX models.