code: def test_no_shared_as_input(self):
      # Test that shared variables cannot be used as function inputs.
      w_init = np.random.random((2, 2))
      w = shared(w_init.copy(), "w")
      with pytest.raises(
          TypeError,
          match=r"^Cannot use a shared variable \(w\) as explicit input",
      ):
          pfunc([w], pt_sum(w * w))
  
imports: import numpy
  import pytest
  import pytensor.tensor
  from pytensor.compile import UnusedInputError, get_mode
  from pytensor.compile.function import function, pfunc
  from pytensor.compile.function.pfunc import rebuild_collect_shared
  from pytensor.compile.io import In
  from pytensor.compile.sharedvalue import shared
  from pytensor.configdefaults import config
  from pytensor.graph.utils import MissingInputError
  from pytensor.misc.safe_asarray import _asarray
  from pytensor.tensor.math import sum
  from pytensor.tensor.type import bscalar, bvector, dmatrices, dmatrix, dscalar, dvector, fscalar, fvector, imatrix, iscalar, ivector, ivectors, lscalar, wvector
  from pytensor.utils import PYTHON_INT_BITWIDTH
label_desc: Use image node_id 4 for calling the TestPfunc obj's underlying member method code with example usage: obj.test_no_shared_as_input() without return types