An evaluator using onnxscript API to build graph using torchscript (we will have our own graph to replace torchscript.)

[GitHub2Janky]

An evaluator using onnxscript API to build graph using torchscript (we will have our own graph to replace torchscript.)

works with pytorch/pytorch#92717

1. Op object triggers graph_eval instead of eval to begin op insertion for the graph (Need to figure out how to keep both functionality if they need to stay on the same API.)
2. TorchscriptEvaluator serves as a manager of input/output graph. In this demo, both of them are torchscript, so this class seems simple (should be more complicated depending on ONNX graph builder API and format requirements).
3. tensor.py is not modified because onnxscript does not really use the graph value. That is, it will only have to be compatible with graph builder type only in the future implementation.

Fixes #273

Co-authored-by: Ti-Tai Wang titaiwang@microsoft.com

Originally posted by @justinchuby in microsoft/onnxscript#336

[GitHub2Janky]

7000

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#273