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Posted to commits@tvm.apache.org by "Lunderberg (via GitHub)" <gi...@apache.org> on 2024/03/14 21:02:03 UTC
Re: [PR] [RFC] Relax Language Specification [tvm-rfcs]
Lunderberg commented on code in PR #106:
URL: https://github.com/apache/tvm-rfcs/pull/106#discussion_r1525484693
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rfcs/assets/0106/spec.md:
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@@ -276,12 +276,13 @@ To simplify the writing of Relax passes, we define a normal form for Relax progr
The normal form for Relax is very similar to ANF; differences will be noted. Here are the criteria required for a program to be in normal form:
1. Within a `SeqExpr`, the right-hand side of any binding (the `value` field in the AST) must either be a "leaf expression" or a non-leaf expression where all subexpressions are leaf expressions. Leaf expressions are the following: Variables (`Var`, `DataflowVar`, or `GlobalVar`), `Constant`, `ShapeExpr`, `PrimValue`, `StringImm`, `DataTypeImm`, or (_unlike_ ANF) `Tuple`. `Tuple` nodes are considered "leaf" expressions even though they contain nesting purely for convenience in writing passes; many operators rely on grouping arguments using tuples, so that is a form of nesting permitted and expected. Otherwise, non-leaf expressions used as subexpressions must be bound to variables; this includes any non-leaf expressions nested inside a `Tuple`.
-2. `SeqExpr`s may appear only in the following locations:
+2. As an addition to the above, all variables of type `TupleStructInfo([])`, the unit tuple, are inlined during normalization. That is, all uses of variables with the type `TupleStructInfo([])` will be replaced directly with the value `Tuple([])` (the unit tuple).
Review Comment:
Thank you for making the updates here, and this looks accurate to the changes after https://github.com/apache/tvm/pull/16658
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