Add topology sort and remove useless cast nodes to fp16 conversion script #21499
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Description
Merge two post-processes (topology sort and remove cascaded cast nodes) by xiaowuhu:
microsoft/onnxconverter-common#291
microsoft/onnxconverter-common#293
Even though there is similar post-processing in OnnxModel class. Add these to fp16 to avoid circular import, and make it self-independent. We can refactor them into a helper class later.
Motivation and Context
#21345