After some consideration I think #2914 is not the best way to support tuple in fusion. 0: it could handle tuple of tuple, it is the relay interpreter that is incorrect (it didnot recursively fset, but instead assume it is either tensor or tuple of tensor). 1: it should not care about reference at all! as operator accept recursive tuple of tensor, if there is reference in the code, it will never become a tensor (except by function call, or refget). the correct place to catch for reference, is at refget/forigen function call, and not a tensor.
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