return reversed list

Author: masahi

python/tvm/meta_schedule/integration.py

@@ -247,4 +247,5 @@ def extract_task_from_relay(
         disabled_pass=disabled_pass,
     ):
         tasks = extract_task_func(mod, target, relay_params)
-        return tasks
+        # Tasks are extracted via post order visit, return the reversed list.
+        return list(reversed(tasks))

src/meta_schedule/integration.cc

@@ -120,6 +120,10 @@ IRModule ApplyHistoryBestNode::Query(runtime::String task_name, IRModule mod, Ta
   ICHECK(HasOnlyOneFunction<relay::Function>(mod)) << mod;
   IRModule prim_mod = dispatched.value()[0];
   ICHECK(HasOnlyOneFunction<tir::PrimFunc>(prim_mod)) << prim_mod;
+  // TODO(masahi): parse_mod below replaces the orginal function key with "main".
+  // This is necessary because some scheduling primitives requires the PrimFunc key be "main".
+  // If we can remove this restriction, there would no need for GetOnlyOneFunction* calls below
+  // and we can directly return sch->mod().
   auto gv = GetOnlyOneFunctionKey<tir::PrimFunc>(prim_mod).value();
   // Unify func name to make sure it can be found in database
   const auto* parse_mod_func = runtime::Registry::Get("tvm.meta_schedule.tune.parse_mod");