[ONNX] Tool to verify exported model discrepancy between sets of inputs
A graph is exported for each set of inputs. The exported graphs are then compared
to each other, and discrepancies are reported. This function first checks the jit
graph, and then the onnx graph.
Unless otherwise specified, the jit/ONNX graph is expected to be the same, regardless
of the inputs it used for exporting. A discrepancy would imply the graph exported is
not accurate when running with other set of inputs, which will typically results in
runtime error or output mismatches.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78323
Approved by: https://github.com/justinchuby, https://github.com/garymm
