code: def test_degen_symeig():
      from deepchem.utils.differentiation_utils.symeig import (
          degen_symeig,
      )
      from deepchem.utils.differentiation_utils import LinearOperator
  
      A = LinearOperator.m(torch.rand(2, 2))
      evals, evecs = degen_symeig.apply(A.fullmatrix())
      assert evals.shape == torch.Size([2])
      assert evecs.shape == torch.Size([2, 2])
  
imports: import pytest
label_desc: Use image node_id 28 for calling a global function with example usage: test_degen_symeig() without return types