Check onnx models more easily

[AlexandreEichenberger]

Added a new python script built on top of runONNXModel.py to quickly compare the results of a single model compiled under 2 set of different options.

Added .md info as well as a small example in the header file, copied below

# This script is to run and debug an onnx model. Model is run twice, once with
# safe compile options, and the second time with the options to tests. The
# script verifies that both output are the same.

# This script can be used as follows:
#
# CheckONNXModel.py --model=reducegpt2.mlir --test-compile-args="-O3 -march=x86-64" --shape-info=0:10x20
#
# It will compile and run the model reducegpt2.mlir twice.
# * Once with the default (-O0) option, which can be overridden with
#   --ref-compile-args. This will build reference results stored by default
#   in a subdir named "check-ref", which can be overridden with --save-ref="name"
#   option. Building the reference values can be skipped with "--skip-ref"
#   option if it was previously built with the same compile options.
# * Once with the default (-O3) option, which can be overridden with
#   --test-compile-args. The values of this run are compared with the reference
#   values.
#
# Script will fail if the values are not identical. Currently only the
# "--verify-every-value" option is supported.
#
# This script relies on RunONNXModel.py to compile, run, and test. The actual
# commands used by this script are printed on stdout, so that users may call
# them manually if they wish to employ more RunONNXModel.py options.
# 

[tungld]

LGTM!

Thanks for adding another useful tool!

[jenkins-droid]

Jenkins Linux ppc64le Build #11008 [push] Check onnx models more e... started at 18:43

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Jenkins Linux s390x Build #12014 [push] Check onnx models more e... started at 18:37

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Jenkins Linux amd64 Build #12001 [push] Check onnx models more e... started at 17:37

[jenkins-droid]

Jenkins Linux amd64 Build #12001 [push] Check onnx models more e... passed after 1 hr 15 min

[jenkins-droid]

Jenkins Linux s390x Build #12014 [push] Check onnx models more e... passed after 1 hr 27 min

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Jenkins Linux ppc64le Build #11008 [push] Check onnx models more e... passed after 1 hr 50 min