[Relax][Bugfix] Bind symbolic variables in R.match_cast #17023
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Prior to this commit, variable replacement by `BindSymbolicVars` would fail to replace variables that occur within a `relax::MatchCast` node. This pattern is rare, because the `bind_symbolic_vars` method can only replace variables that are exposed as part of the function signature, and most uses of `relax::MatchCast` act as a definition for symbolic variables that are not exposed through the function signature. This pattern is well-formed, though, since the `relax::MatchCast` node can also act as a user of previously-defined symbolic variables. The root cause for this bug was in the `ExprMutator` visitor for `relax::MatchCast`, which did not visit the struct info field. As a result, the virtual `ExprMutator::VisitPrimExpr` function was not called for expressions that occur within the `StructInfo` of a `relax::MatchCast`. This commit updates `ExprMutator` to resolve this bug, and applies an analogous fix for `ExprVisitor`. Co-authored-by: Chris Sullivan <[email protected]>
tqchen
approved these changes
May 24, 2024
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Closing to resubmit as a new PR (same issue as mentioned here), due to CI issues. |
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Prior to this commit, variable replacement by
BindSymbolicVarswould fail to replace variables that occur within arelax::MatchCastnode. This pattern is rare, because thebind_symbolic_varsmethod can only replace variables that are exposed as part of the function signature, and most uses ofrelax::MatchCastact as a definition for symbolic variables that are not exposed through the function signature. This pattern is well-formed, though, since therelax::MatchCastnode can also act as a user of previously-defined symbolic variables.The root cause for this bug was in the
ExprMutatorvisitor forrelax::MatchCast, which did not visit the struct info field. As a result, the virtualExprMutator::VisitPrimExprfunction was not called for expressions that occur within theStructInfoof arelax::MatchCast. This commit updatesExprMutatorto resolve this bug, and applies an analogous fix forExprVisitor.