[Fix] Fix the wrong check for tuple node in #18163

[cccxinli]

This pr fix the wrong check for tuple node in #18163

[ysh329]

We noticed that one CI job has been running for a very long time—17 hours since yesterday. Is this normal?

cc @Hzfengsy @MasterJH5574

Looks like it's stuck on the last test, or does this job usually take this long?

[2025-07-29T10:25:53.581Z] PASSED

[2025-07-29T10:25:53.581Z] tests/python/relax/test_transform_few_shot_tuning.py::test_funcs[False-MatMul] 2025-07-29 10:25:53 [INFO] LocalBuilder: max_workers = 16

[2025-07-29T10:25:57.744Z] PASSED

[2025-07-29T10:25:57.745Z] tests/python/relax/test_transform_few_shot_tuning.py::test_funcs[False-Fuse_Mean_Cast1] 2025-07-29 10:25:57 [INFO] LocalBuilder: max_workers = 16

[2025-07-29T10:26:01.010Z] PASSED

[2025-07-29T10:26:01.010Z] tests/python/relax/test_transform_few_shot_tuning.py::test_funcs[False-Module] 2025-07-29 10:26:00 [INFO] LocalBuilder: max_workers = 16

[2025-07-29T10:26:06.253Z] PASSED

[2025-07-29T10:26:06.253Z] tests/python/relax/test_transform_few_shot_tuning.py::test_funcs[True-Softmax] 2025-07-29 10:26:06 [INFO] LocalBuilder: max_workers = 16

[cccxinli]

Hi @Hzfengsy , Sorry I did a wrong check for tuple node in #18163 . This pr fix the bug. Please take a moment to review it when you have time. Thank you.

[Copilot]

Pull Request Overview

This PR fixes an incorrect check for tuple nodes in the FunctionCreator class within the fuse_ops transformation. The issue was that the code was checking for tuple struct info before properly handling the tuple node case.

• Reorders the tuple checking logic to properly handle tuple nodes before checking struct info
• Moves the partially_used_tuple_params_.erase() call to execute after tuple processing

[Copilot]

The condition arg.as<TupleNode>() only checks if the argument is a TupleNode, but the subsequent code unconditionally downcasts to Tuple. This could cause a runtime error if the argument has TupleStructInfo but is not actually a TupleNode. Consider using if (auto tuple = arg.as<TupleNode>()) and use the tuple variable directly.

Suggested change

	if (arg.as<TupleNode>()) {
	const Tuple& tup_args = Downcast<Tuple>(arg);
	for (const Expr& tup_arg : tup_args->fields) {
	if (auto tuple = arg.as<TupleNode>()) {
	for (const Expr& tup_arg : tuple->fields) {