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Add support for sym_ite (pytorch#111440)
This PR supports sym_ite. This is useful for converting SymBool to SymInt in e.g. pytorch#109916. Internally, it uses sympy.Piecewise. We cannot use sympy.ITE because it expects the arguments and output all to be boolean type but we want return SymInt type when converting a SymBool to SymInt. So we use sympy.Piecewise to denote the symbolic relationship. Note that this pr uses the range analysis for sympy.Piecewise implemented in https://github.com/pytorch/pytorch/blob/main/torch/utils/_sympy/value_ranges.py. Test Plan: See added test. Pull Request resolved: pytorch#111440 Approved by: https://github.com/ezyang
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