[Parser][Printer] relax call_packed arity, return IRModule factory, p…

…rint IRModule PrimFuncs (#17)

python/tvm/relax/parser.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import inspect
-from typing import TypeVar, Generic, Union, Dict, List, Tuple, Optional
+from typing import TypeVar, Generic, Union, Dict, List, Tuple, Optional, Callable
 from io import StringIO
 from enum import Enum
 
@@ -837,19 +837,14 @@ def parse_call(self, expr: ast.Call) -> Union[tir.PrimExpr, rx.Expr]:
         op = self.transform_expr(expr.func_name)
 
         if op == SpecialOp.CALL_PACKED:
-            if len(expr.params) != 2:
-                self.report_error(
-                    op.value + " takes an extern function name and a tuple of arguments",
-                    expr.span,
-                )
             extern_func = expr.params[0]
             if not (isinstance(extern_func, ast.Constant) and isinstance(extern_func.value, str)):
                 self.report_error(
                     "the first argument of " + op.value + " must be the extern function name",
                     extern_func.span,
                 )
             op = rx.ExternFunc(extern_func.value, self.to_tvm_span(extern_func.span))
-            args = [self.transform_expr(expr.params[1])]
+            args = [self.transform_expr(arg) for arg in expr.params[1:]]
 
         elif isinstance(op, ArithmeticOp):
             args = [self.transform_expr(arg) for arg in expr.params]
@@ -1045,7 +1040,7 @@ def transform_block(self, block: ast.Block) -> rx.SeqExpr:
 #         self.tvm_diag_ctx.render()
 
 
-def script(f) -> Union[rx.Function, tvm.IRModule]:
+def script(f) -> Union[rx.Function, Callable[[], tvm.IRModule]]:
     """Parses the decorated Relax function or module (in Relax IR) to a Relax AST.
 
     Parameters
@@ -1056,15 +1051,19 @@ def script(f) -> Union[rx.Function, tvm.IRModule]:
     Returns
     -------
     Union[rx.Function, IRModule]
-        The parsed Relax function or IRModule.
+        The parsed Relax function or IRModule factory (which returns the parsed IRModule when
+        called).
     """
     diag_ctx = tvm.script.diagnostics.TVMDiagnosticCtx()
     ast = synr.to_ast(f, diag_ctx)
-    return RelaxTransformer().do_transform(ast, diag_ctx)
+    mod = RelaxTransformer().do_transform(ast, diag_ctx)
+    if isinstance(mod, tvm.IRModule):
+        return lambda: mod
+    return mod
 
 
 def fromtext(source: str, source_name: str = "from_string") -> Union[rx.Function, tvm.IRModule]:
-    """Parses the given input string (in the Relax text format) to a Relax function or IRModule.
+    """Parses the given input string (in the Relax text format) to a Relax AST.
 
     Parameters
     ----------
@@ -1076,12 +1075,16 @@ def fromtext(source: str, source_name: str = "from_string") -> Union[rx.Function
     Returns
     -------
     Union[rx.Function, IRModule]
-        The parsed Relax function or IRModule.
+        The parsed Relax function or IRModule factory (which returns the parsed IRModule when
+        called).
     """
     # TODO(@altanh): actually use source_name somewhere?
     diag_ctx = tvm.script.diagnostics.TVMDiagnosticCtx()
     ast = synr.to_ast(source, diag_ctx)
-    return RelaxTransformer().do_transform(ast, diag_ctx)
+    mod = RelaxTransformer().do_transform(ast, diag_ctx)
+    if isinstance(mod, tvm.IRModule):
+        return lambda: mod
+    return mod
 
 
 def pretty_print(node):

src/relay/printer/relax_script_printer.cc

@@ -77,6 +77,7 @@ class RelaxScriptPrinter : public relax::IRFunctor<Doc(const ObjectRef&)>,
   Doc VisitExpr_(const tir::FloorDivNode* op) override;
 
   Doc PrintIRModule(const IRModule& mod);
+  Doc PrintPrimFunc(const String& name, const tir::PrimFunc& func);
 
   Doc PrintIfStmt(const relax::Var& var, const relay::If& ite);
   Doc PrintFunctionDef(const Doc& name, const relax::Function& func);
@@ -178,17 +179,19 @@ Doc RelaxScriptPrinter::VisitNode_(const relay::CallNode* op) {
   // TODO(@altanh): how to support when func cannot be printed as Python expr?
   //                e.g. Function or If
   Doc doc;
+  std::vector<Doc> args;
 
   if (op->op.as<relax::ExternFuncNode>()) {
-    ICHECK_EQ(op->args.size(), 1) << "extern calls should only have one argument";
-    doc << "relax.call_packed(" << Print(op->op) << ", " << Print(op->args[0]);
+    doc << "relax.call_packed";
+    args.push_back(Print(op->op));
   } else {
-    std::vector<Doc> args;
-    for (const Expr& arg : op->args) {
-      args.push_back(Print(arg));
-    }
-    doc << Print(op->op) << "(" << Doc::Concat(args, Doc::Text(", "));
+    doc << Print(op->op);
+  }
+
+  for (const Expr& arg : op->args) {
+    args.push_back(Print(arg));
   }
+  doc << "(" << Doc::Concat(args, Doc::Text(", "));
 
   std::vector<Doc> attrs = PrintAttrs(op->attrs);
   if (!attrs.empty()) {
@@ -260,12 +263,7 @@ Doc RelaxScriptPrinter::VisitNode_(const relax::VarBindingNode* op) {
   } else if (const relax::FunctionNode* func = op->value.as<relax::FunctionNode>()) {
     return PrintFunctionDef(Print(op->var), GetRef<relax::Function>(func));
   } else if (const tir::PrimFuncNode* prim_func = op->value.as<tir::PrimFuncNode>()) {
-    // we need the mod for TVMScriptPrinter to properly print the function name - maybe it's worth
-    // refactoring to avoid this?
-    tir::PrimFunc prim_func_ref = GetRef<tir::PrimFunc>(prim_func);
-    IRModule mod;
-    mod->Add(relay::GlobalVar(op->var->name_hint()), prim_func_ref);
-    return tir::AsTVMScriptDoc(mod, false, prim_func_ref);
+    return PrintPrimFunc(op->var->name_hint(), GetRef<tir::PrimFunc>(prim_func));
   } else {
     Doc doc;
     doc << Print(op->var) << PrintVarAnnotation(op->var);
@@ -426,11 +424,25 @@ Doc RelaxScriptPrinter::PrintIRModule(const IRModule& mod) {
   Doc doc;
   doc << "class Module:";
   for (const std::pair<GlobalVar, BaseFunc>& pr : mod->functions) {
-    doc << Doc::Indent(4, Doc::NewLine() << Print(pr.second));
+    Doc func;
+    if (pr.second.as<tir::PrimFuncNode>()) {
+      func = PrintPrimFunc(pr.first->name_hint, Downcast<tir::PrimFunc>(pr.second));
+    } else {
+      func = Print(pr.second);
+    }
+    doc << Doc::Indent(4, Doc::NewLine() << func);
   }
   return doc;
 }
 
+Doc RelaxScriptPrinter::PrintPrimFunc(const String& name, const tir::PrimFunc& func) {
+  // we need the mod for TVMScriptPrinter to properly print the function name - maybe it's worth
+  // refactoring to avoid this?
+  IRModule mod;
+  mod->Add(relay::GlobalVar(name), func);
+  return tir::AsTVMScriptDoc(mod, false, func);
+}
+
 Doc RelaxScriptPrinter::PrintIfStmt(const relax::Var& var, const relay::If& ite) {
   const relax::SeqExprNode* true_branch = ite->true_branch.as<relax::SeqExprNode>();
   const relax::SeqExprNode* false_branch = ite->false_branch.as<relax::SeqExprNode>();

tests/python/relax/test_parser.py

@@ -432,9 +432,9 @@ def my_matmul(a: ty.handle, b: ty.handle, c: ty.handle) -> None:
 
 def test_call_packed():
     @rx.script
-    def f(x: Tensor[(3, 4), "float32"]):
+    def f(x: Tensor[(3, 3), "float32"]):
         # test that we can intro dim vars
-        z: Tensor[(n, m), "float32"] = relax.call_packed("contrib.my_matmul", (x, x), mp=False)
+        z: Tensor[(n, m), "float32"] = relax.call_packed("contrib.my_matmul", x, x, mp=False)
         return z
 
     x = f.params[0]
@@ -444,7 +444,7 @@ def f(x: Tensor[(3, 4), "float32"]):
     assert isinstance(z_bind.value.op, rx.ExternFunc)
     assert z_bind.value.op.global_symbol == "contrib.my_matmul"
     assert "mp" in z_bind.value.attrs and z_bind.value.attrs["mp"] == False
-    assert structural_equal(z_bind.value.args, [rx.Tuple([x, x])])
+    assert structural_equal(z_bind.value.args, [x, x])
 
 
 def test_primexpr_arithmetic():
@@ -480,18 +480,36 @@ def f(x: Tensor):
 
 def test_class_irmodule():
     @rx.script
-    class my_module:
-        def f(x: Tensor[(n, m), _]) -> Tensor:
+    class MyModule:
+        @tvm.script.tir
+        def my_matmul(a: ty.handle, b: ty.handle, c: ty.handle) -> None:
+            A = tir.match_buffer(a, [128, 128])
+            B = tir.match_buffer(b, [128, 128])
+            C = tir.match_buffer(c, [128, 128])
+
+            with tir.block([128, 128, tir.reduce_axis(0, 128)], "update") as [vi, vj, vk]:
+                with tir.init():
+                    C[vi, vj] = tir.float32(0)
+                C[vi, vj] = C[vi, vj] + A[vi, vk] * B[vj, vk]
+
+        def f(x: Tensor[(n, n), _]) -> Tensor:
             return g(x)
 
-        def g(y: Tensor[(n, m), _]) -> Tensor:
-            return y
+        def g(y: Tensor[(n, n), _]) -> Tensor:
+            return relax.call_dps((n, n), my_matmul, (y, y))
+
+        def h(x, y, z):
+            _ = my_matmul(x, y, z)
+            return z
 
+    my_module = MyModule()
     assert isinstance(my_module, tvm.IRModule)
 
     var_f = my_module.get_global_var("f")
     var_g = my_module.get_global_var("g")
+    var_my_matmul = my_module.get_global_var("my_matmul")
     f = my_module[var_f]
     g = my_module[var_g]
 
     assert f.body.body.op == var_g
+    assert g.body.body.args[1] == var_my_matmul

tests/python/relax/test_printer.py

@@ -25,6 +25,8 @@
 
 def check_roundtrip(f_pre):
     f_post = rx.parser.fromtext(rx.parser.astext(f_pre))
+    if isinstance(f_pre, tvm.IRModule):
+        f_post = f_post()
     assert_structural_equal(f_pre, f_post, map_free_vars=True)
 
 
@@ -140,9 +142,9 @@ def my_matmul(a: ty.handle, b: ty.handle, c: ty.handle) -> None:
 
 def test_call_packed():
     @rx.script
-    def foo(x: Tensor[(3, 4), "float32"]):
+    def foo(x: Tensor[(3, 3), "float32"]):
         # test that we can intro dim vars
-        z: Tensor[(n, m), "float32"] = relax.call_packed("contrib.my_matmul", (x, x), mp=False)
+        z: Tensor[(n, m), "float32"] = relax.call_packed("contrib.my_matmul", x, x, mp=False)
         return z
 
     check_roundtrip(foo)
@@ -169,11 +171,27 @@ def foo(x: Tensor):
 
 def test_class_irmodule():
     @rx.script
-    class my_module:
-        def f(x: Tensor[(n, m), _]) -> Tensor:
+    class MyModule:
+        @tvm.script.tir
+        def my_matmul(a: ty.handle, b: ty.handle, c: ty.handle) -> None:
+            A = tir.match_buffer(a, [128, 128])
+            B = tir.match_buffer(b, [128, 128])
+            C = tir.match_buffer(c, [128, 128])
+
+            with tir.block([128, 128, tir.reduce_axis(0, 128)], "update") as [vi, vj, vk]:
+                with tir.init():
+                    C[vi, vj] = tir.float32(0)
+                C[vi, vj] = C[vi, vj] + A[vi, vk] * B[vj, vk]
+
+        def f(x: Tensor[(n, n), _]) -> Tensor:
             return g(x)
 
-        def g(y: Tensor[(n, m), _]) -> Tensor:
-            return y
+        def g(y: Tensor[(n, n), _]) -> Tensor:
+            return relax.call_dps((n, n), my_matmul, (y, y))
+
+        def h(x, y, z):
+            _ = my_matmul(x, y, z)
+            return z
 
-    check_roundtrip(my_module)
+    mod = MyModule()
+    check_roundtrip(mod)