code: def eigvals(self):
      return self.eigendecomposition["eigval"]
  
imports: from copy import copy
  import numpy
  import pytest
  import pennylane
  from pennylane.operation import DecompositionUndefinedError
  from pennylane.ops.op_math import CompositeOp, Prod, Sum, SProd
  from pennylane.wires import Wires
label_desc: Use image node_id 4 for calling the ValidOp obj's underlying member method code with example usage: obj.eigvals() and returns: self