[TVMScript][Relax] Use tir.SizeVar for shape variables #16949
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As reported in apache#16877, shape inference performed during a Relax transformation may produce different results than shape inference performed during TVMScript parsing. While Relax transformations call `Analyzer::MarkGlobalNonNegValue` for each shape expression, this is not provided during TVMScript parsing. As a result, output shapes that are conditional on the sign of a variable may produce different results when simplifying. This commit provides a partial resolution for this issue. Where prior to this commit, the TVMScript parser generated a `tir.Var` for each symbolic variable, the TVMScript parser now provides a `tir.SizeVar` for symbolic variables that are defined in contexts that require a non-negative size.
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As reported in #16877, shape inference performed during a Relax transformation may produce different results than shape inference performed during TVMScript parsing. While Relax transformations call
Analyzer::MarkGlobalNonNegValuefor each shape expression, this is not provided during TVMScript parsing. As a result, output shapes that are conditional on the sign of a variable may produce different results when simplifying.This commit provides a partial resolution for this issue. Where prior to this commit, the TVMScript parser generated a
tir.Varfor each symbolic variable, the TVMScript parser now provides atir.SizeVarfor symbolic variables that are defined in contexts that require a non-negative size.