[I] [Bug] [Relax] Expect a not null value of IRModule [tvm]

[via GitHub]

Cookiee235 opened a new issue, #17230:
URL: https://github.com/apache/tvm/issues/17230

   ### Actual behavior
   
   ```
   Traceback (most recent call last):
     File "test.py", line 22, in <module>
       mod = tvm.relax.transform.LegalizeOps()(mod)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "/software/tvm-lunder/python/tvm/ir/transform.py", line 238, in 
__call__
       return _ffi_transform_api.RunPass(self, mod)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "/software/tvm-lunder/python/tvm/_ffi/_ctypes/packed_func.py", line 
240, in __call__
       raise_last_ffi_error()
     File "/software/tvm-lunder/python/tvm/_ffi/base.py", line 481, in 
raise_last_ffi_error
       raise py_err
   tvm._ffi.base.TVMError: Traceback (most recent call last):
     1: 
tvm::runtime::PackedFuncObj::Extractor<tvm::runtime::PackedFuncSubObj<tvm::runtime::TypedPackedFunc<tvm::IRModule
 (tvm::transform::Pass, 
tvm::IRModule)>::AssignTypedLambda<tvm::transform::{lambda(tvm::transform::Pass,
 tvm::IRModule)#7}>(tvm::transform::{lambda(tvm::transform::Pass, 
tvm::IRModule)#7}, std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >)::{lambda(tvm::runtime::TVMArgs const&, 
tvm::runtime::TVMRetValue*)#1}> >::Call(tvm::runtime::PackedFuncObj const*, 
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> 
>, tvm::runtime::TVMRetValue)
     0: tvm::runtime::TVMMovableArgValueWithContext_::operator 
tvm::IRModule<tvm::IRModule>() const
     2: 
tvm::runtime::PackedFuncObj::Extractor<tvm::runtime::PackedFuncSubObj<tvm::runtime::TypedPackedFunc<tvm::IRModule
 (tvm::transform::Pass, 
tvm::IRModule)>::AssignTypedLambda<tvm::transform::{lambda(tvm::transform::Pass,
 tvm::IRModule)#7}>(tvm::transform::{lambda(tvm::transform::Pass, 
tvm::IRModule)#7}, std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> >)::{lambda(tvm::runtime::TVMArgs const&, 
tvm::runtime::TVMRetValue*)#1}> >::Call(tvm::runtime::PackedFuncObj const*, 
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> 
>, tvm::runtime::TVMRetValue)
     1: tvm::runtime::TVMMovableArgValueWithContext_::operator 
tvm::IRModule<tvm::IRModule>() const
     0: tvm::IRModule tvm::runtime::TVMPODValue_::AsObjectRef<tvm::IRModule>() 
const
     File "/software/tvm-lunder/include/tvm/runtime/packed_func.h", line 785
   TVMError: In function transform.RunPass(0: transform.Pass, 1: IRModule) -> 
IRModule: error while converting argument 1: [21:44:09] 
/software/tvm-lunder/include/tvm/runtime/packed_func.h:2022: Check failed: 
(TObjectRef::_type_is_nullable) is false: Expect a not null value of IRModule
   ```
   
   
   
   ### Steps to reproduce
   
   ```
   import tvm
   from tvm import relax
   
   from tvm.script import ir as I
   from tvm.script import tir as T
   from tvm.script import relax as R
   
   @I.ir_module
   class Module:
       @R.function
       def main(v1_0: R.Tensor((1,), dtype="float16"), v6_0: R.Tensor((1, 40, 
25, 1), dtype="float16")) -> R.Tensor((), dtype="float16"):
           with R.dataflow():
               lv: R.Tensor((), dtype="float16") = R.sum(v6_0, axis=None, 
keepdims=False)
               R.output(lv)
           return lv
   
   
   mod = Module
   mod = tvm.relax.transform.DeadCodeElimination()(mod)
   mod = mod.show()
   mod = tvm.relax.transform.LegalizeOps()(mod)
   ```
   
   cc @Lunderberg @junrushao 


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